{"title":"Littelfuse KLKR Series Fuses","description":"\u003cp\u003eBrowse Littelfuse KLKR Class CC fast-acting fuses by exact model and amp rating. Review each product listing for voltage, interrupting rating, dimensions, and compatibility.\u003c\/p\u003e","products":[{"product_id":"littelfuse-klkr-25-fuse","title":"Littelfuse KLKR-25 Class CC Fuse 25A 600VAC 300VDC Fast-Acting","description":"\u003cstyle\u003e.nxs-industrial-product-page{--industrial-navy:#082f49;--industrial-blue:#0b4f7c;--industrial-blue-2:#0f6ea8;--industrial-blue-3:#1784c1;--industrial-cyan:#38bdf8;--steel-blue:#dcebf5;--steel-blue-2:#edf6fb;--steel-line:#c9dce9;--surface:#ffffff;--surface-soft:#f7fbfe;--text-main:#173042;--text-muted:#5e7382;--shadow-soft:0 10px 30px rgba(8,47,73,0.08);--shadow-hover:0 16px 36px rgba(8,79,124,0.15);--radius-lg:14px;--radius-md:10px;}.nxs-industrial-product-page,.nxs-industrial-product-page *{margin:0;padding:0;box-sizing:border-box;font-family:Arial,Helvetica,sans-serif;}.nxs-industrial-product-page{background-color:#f3f8fb;background-image:linear-gradient(180deg,#eef6fb 0,#f7fafc 320px,#eef3f7 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.section:last-of-type\u003ep::before{left:12px;top:15px;min-width:26px;height:26px;font-size:10px;}}@media (prefers-reduced-motion:reduce){.nxs-industrial-product-page,.nxs-industrial-product-page *,.nxs-industrial-product-page *::before,.nxs-industrial-product-page *::after{transition:none !important;}}\u003c\/style\u003e\u003cdiv class=\"nxs-industrial-product-page\"\u003e\u003cdiv class=\"container\"\u003e\u003cmain\u003e\u003csection class=\"section\"\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eKLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eFast-Acting Current-Limiting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e25 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eClass CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 × 38.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUL Standard\u003c\/td\u003e\n\u003ctd\u003eUL 248-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUL Listing\u003c\/td\u003e\n\u003ctd\u003eUL Listed, File E81895\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCSA Certification\u003c\/td\u003e\n\u003ctd\u003eCSA Certified, File LR29862\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnvironmental Compliance\u003c\/td\u003e\n\u003ctd\u003eRoHS Compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/section\u003e\u003csection class=\"section\"\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\u003ch3\u003e25 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-25 has a documented current rating of 25 A within the Littelfuse KLKR Class CC fuse series.\u003c\/p\u003e\u003c\/article\u003e\u003carticle class=\"card\"\u003e\u003ch3\u003e600 VAC and 300 VDC\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-25 is rated for circuits up to 600 VAC and 300 VDC.\u003c\/p\u003e\u003c\/article\u003e\u003carticle class=\"card\"\u003e\u003ch3\u003eFast-Acting Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series uses fast-acting characteristics for general-purpose branch circuit protection.\u003c\/p\u003e\u003c\/article\u003e\u003carticle class=\"card\"\u003e\u003ch3\u003eClass CC Construction\u003c\/h3\u003e\n\u003cp\u003eThe fuse uses the compact Class CC format and is covered by UL 248-4.\u003c\/p\u003e\u003c\/article\u003e\u003carticle class=\"card\"\u003e\u003ch3\u003eCurrent-Limiting Design\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series is designed as a highly current-limiting fuse for branch circuit protection.\u003c\/p\u003e\u003c\/article\u003e\u003carticle class=\"card\"\u003e\u003ch3\u003e10.3 × 38.1 mm Size\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-25 uses a compact cylindrical format measuring approximately 10.3 mm in diameter and 38.1 mm in length.\u003c\/p\u003e\u003c\/article\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"section\"\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose branch circuit protection\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment\u003c\/li\u003e\n\u003cli\u003eIndustrial control panels\u003c\/li\u003e\n\u003cli\u003eSolid-state device protection\u003c\/li\u003e\n\u003cli\u003eElectronic equipment circuits\u003c\/li\u003e\n\u003cli\u003eClass CC fuse circuits\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e\u003csection class=\"section\"\u003e\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-25 Class CC Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.\u003c\/p\u003e\u003c\/section\u003e\u003csection class=\"section\"\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is Littelfuse KLKR-25?\u003c\/strong\u003e\u003cbr\u003eLittelfuse KLKR-25 is a 25 A fast-acting Class CC fuse from the KLKR series for general-purpose branch circuit protection.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-25?\u003c\/strong\u003e\u003cbr\u003eThe documented current rating is 25 A.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat is the AC voltage rating of KLKR-25?\u003c\/strong\u003e\u003cbr\u003eThe documented AC voltage rating is 600 VAC.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat is the DC voltage rating of KLKR-25?\u003c\/strong\u003e\u003cbr\u003eThe documented DC voltage rating is 300 VDC.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat fuse class is KLKR-25?\u003c\/strong\u003e\u003cbr\u003eThe KLKR-25 belongs to the UL Class CC fuse category.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eIs KLKR-25 fast-acting?\u003c\/strong\u003e\u003cbr\u003eYes. Littelfuse specifies the KLKR series as fast-acting fuses.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat is the AC interrupting rating?\u003c\/strong\u003e\u003cbr\u003eThe documented AC interrupting rating is 200 kA RMS symmetrical.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat is the DC interrupting rating?\u003c\/strong\u003e\u003cbr\u003eThe documented DC interrupting rating is 20 kA.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of KLKR-25?\u003c\/strong\u003e\u003cbr\u003eThe documented Class CC dimensions are approximately 10.3 mm diameter by 38.1 mm length.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat applications are specified for the KLKR series?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies the KLKR series for general-purpose branch circuit protection, including OEM equipment and control panels.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eCan KLKR-25 be used for electronic equipment protection?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series fast-acting response is intended for circuits where solid-state devices and other electronic equipment require fast-acting protection. Circuit ratings and coordination requirements should be verified before use.\u003c\/p\u003e\n\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-25?\u003c\/strong\u003e\u003cbr\u003eCheck the KLKR-25 model marking, 25 A current rating, required 600 VAC or 300 VDC rating, Class CC requirements, 10.3 × 38.1 mm dimensions and circuit protection requirements before purchasing.\u003c\/p\u003e\u003c\/section\u003e\u003c\/main\u003e\u003c\/div\u003e\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"1PC","offer_id":46788717838415,"sku":"CL5-Littelfuse-KLKR-25","price":6.98,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67873255293007,"sku":"CL5-Littelfuse-KLKR-25*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"10PCS","offer_id":46788717871183,"sku":"CL5-Littelfuse-KLKR-25*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67873255325775,"sku":"CL5-Littelfuse-KLKR-25*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-25.jpg?v=1789551362"},{"product_id":"littelfuse-klkr-1-10-fuse","title":"Littelfuse KLKR-1\/10 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-1\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLKR.100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Marking\u003c\/td\u003e\n\u003ctd\u003eKLKR 1\/10 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e0.1 A (100 mA, 1\/10 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e100 mA Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-1\/10 provides a 0.1 ampere current rating, equivalent to 100 milliamperes, for appropriately specified low-current electrical circuits. Its precise fractional-amperage designation supports replacement and selection where a 1\/10 A Class CC fuse is specified.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series is designed for equipment requiring a fast response to overcurrent conditions. Unlike the KLDR time-delay series, KLKR fast-acting fuses are intended for applications where rapid overload protection is required. Selection should account for any normal circuit startup or inrush current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series supports compatible AC applications up to 600 VAC and DC applications up to 300 VDC. The applicable voltage rating, fuse current rating and prospective fault current should be checked against the electrical requirements of the circuit.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eFeatures an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The fuse must be selected so that available fault current does not exceed the relevant interrupting rating.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce heating and magnetic effects associated with short-circuit currents. Class CC rejection-style construction also helps prevent the use of fuses with insufficient voltage or interrupting ratings when installed in compatible rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Construction\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge size. The compact format is suited to appropriately rated Class CC fuse holders, including Littelfuse L60030C and LPSC\/LFPSC Touch-Safe series.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eCompatible solid-state component protection applications\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-1\/10 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-1\/10?\u003c\/strong\u003e\u003cbr\u003eIt is a 0.1 A (100 mA) Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series, designed for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR.100, and the product marking is KLKR 1\/10 A. The manufacturer lists KLKR.100T as the ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-1\/10?\u003c\/strong\u003e\u003cbr\u003eThe current rating is 0.1 ampere, equivalent to 100 milliamperes or one-tenth of an ampere.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a maximum voltage rating of 600 VAC and 300 VDC for the KLKR series. The selected fuse must be suitable for the applicable operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/10 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-1\/10 is a fast-acting fuse. It belongs to the KLKR series, which is intended for fast overload response. The KLDR series has a different time-delay characteristic and should not be treated as an electrically identical replacement.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-1\/10 replace a KLDR-1\/10 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both belong to the Class CC family and have the same nominal current and voltage ratings, KLKR is fast-acting while KLDR is time-delay. A replacement must match the circuit protection design, including overload response and inrush-current requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/10 suitable for solid-state electrical equipment?\u003c\/strong\u003e\u003cbr\u003eLittelfuse identifies solid-state components among the applications for the KLKR series. However, fuse suitability for a specific electronic device must be checked against its required protection characteristics, manufacturer recommendations and relevant time-current data.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 13.61 g for the 0.1 A through 1 A ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe series as recommended accessories. Confirm the selected holder has the required Class CC compatibility, voltage rating and electrical capacity.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/10 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. The manufacturer also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-1\/10?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-1\/10 or KLKR.100 designation, 100 mA current rating, 600 VAC or 300 VDC operating requirement, fast-acting characteristics, interrupting capacity and Class CC fuse-holder compatibility. Littelfuse lists ordering number KLKR.100T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"20PCS","offer_id":67902694031439,"sku":"LL1-LI-KLKR-1\/10*20","price":83.76,"currency_code":"USD","in_stock":true},{"title":"10PCS","offer_id":67902694064207,"sku":"LL1-LI-KLKR-1\/10*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67902694096975,"sku":"LL1-LI-KLKR-1\/10*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67902694129743,"sku":"LL1-LI-KLKR-1\/10*5","price":27.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-1_10-01.jpg?v=1793180192"},{"product_id":"littelfuse-klkr-1-4-fuse","title":"Littelfuse KLKR-1\/4 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-1\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLKR.250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Marking\u003c\/td\u003e\n\u003ctd\u003eKLKR 1\/4 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e0.25 A (250 mA, 1\/4 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical (200,000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA (20,000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Protection Function\u003c\/td\u003e\n\u003ctd\u003eFast Overload Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Circuit Protection\u003c\/td\u003e\n\u003ctd\u003eGeneral-Purpose Branch Circuit Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Format\u003c\/td\u003e\n\u003ctd\u003eClass CC Rejection-Style Cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e250 mA Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-1\/4 features a 0.25 ampere current rating, equivalent to 250 milliamperes or one-quarter ampere. This fractional-amperage rating is intended for appropriately specified low-current electrical circuits requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides a fast-acting response to overload conditions for electrical equipment requiring rapid circuit protection. Unlike KLDR time-delay fuses, KLKR fuses are intended for circuits where a fast overload response is desirable. Startup and inrush currents must be considered when selecting the fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe fuse is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Its separate AC and DC ratings support selection according to operating voltage, circuit requirements and available prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eProvides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The available fault current must not exceed the applicable interrupting rating.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eCurrent-limiting construction helps reduce the heating and magnetic effects associated with short-circuit currents. Rejection-style construction helps prevent the use of fuses with insufficient voltage or interrupting ratings when installed in corresponding Class CC fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Construction\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Compatible mounting accessories include appropriately rated Littelfuse L60030C and LPSC\/LFPSC Touch-Safe fuse holder series.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits requiring compatible overcurrent protection\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-1\/4 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-1\/4?\u003c\/strong\u003e\u003cbr\u003eIt is a 0.25 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series. The series is intended for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR.250. Littelfuse specifies the product marking KLKR 1\/4 A and lists KLKR.250T as the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-1\/4?\u003c\/strong\u003e\u003cbr\u003eThe current rating is 0.25 ampere, equivalent to 250 milliamperes or one-quarter of an ampere.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC for the KLKR series. The circuit operating voltage must remain within the applicable AC or DC rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/4 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-1\/4 is a fast-acting fuse. It belongs to the KLKR series, which provides fast overload response. The KLDR series uses a different time-delay characteristic and is not automatically interchangeable.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-1\/4 replace a KLDR-1\/4 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses with the same nominal current rating, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on the circuit design, normal inrush current and required overcurrent response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/4 suitable for solid-state electrical equipment?\u003c\/strong\u003e\u003cbr\u003eLittelfuse identifies solid-state components among the applications for the KLKR series. Suitability for a specific electronic device must be checked against its protection requirements and relevant fuse time-current characteristics.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the manufacturer publish a specific I²t value for KLKR-1\/4?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR series datasheet revised February 25, 2025 includes time-current curves for the 1\/4 A rating but does not list a separate numerical total clearing I²t value for KLKR.250 in its electrical specifications table. Values from other current ratings must not be substituted.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 13.61 g for 0.1 A through 1 A ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Confirm the selected holder has the required Class CC compatibility, voltage rating and electrical capacity.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/4 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. The manufacturer's datasheet also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-1\/4?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-1\/4 or KLKR.250 designation, 250 mA current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. The manufacturer lists KLKR.250T for a 10-piece pack, but this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67902751998031,"sku":"LL1-LI-KLKR-1\/4*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67902752030799,"sku":"LL1-LI-KLKR-1\/4*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67902752063567,"sku":"LL1-LI-KLKR-1\/4*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67902752096335,"sku":"LL1-LI-KLKR-1\/4*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-1_4-01.jpg?v=1793180448"},{"product_id":"littelfuse-klkr-3-10-fuse","title":"Littelfuse KLKR-3\/10 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-3\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLKR.300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Marking\u003c\/td\u003e\n\u003ctd\u003eKLKR 3\/10 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e0.3 A (300 mA, 3\/10 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e300 mA Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-3\/10 features a 0.3 ampere current rating, equivalent to 300 milliamperes or three-tenths of an ampere. This fractional-amperage rating supports applications requiring a specified low-current Class CC fast-acting fuse in industrial electrical equipment and control circuits.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides a fast-acting response to overload conditions for equipment requiring rapid circuit protection. Unlike the KLDR time-delay series, KLKR fuses are intended for applications where a fast overload response is required. Normal startup and inrush currents must be considered during fuse selection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe fuse is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC ratings support protective-device selection according to circuit operating voltage, installation requirements and prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eProvides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC interrupting rating as manufacturer self-certified. Available prospective fault current must remain within the applicable interrupting capacity.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting construction helps reduce heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with corresponding Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Cartridge\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Compatible installation accessories include appropriately rated Littelfuse L60030C and LPSC\/LFPSC Touch-Safe fuse holder series.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits with compatible protection requirements\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-3\/10 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-3\/10?\u003c\/strong\u003e\u003cbr\u003eIt is a 0.3 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series, intended for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR.300. Littelfuse specifies the product marking KLKR 3\/10 A and lists KLKR.300T as the ordering number for a manufacturer 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-3\/10?\u003c\/strong\u003e\u003cbr\u003eThe current rating is 0.3 ampere, equivalent to 300 milliamperes or three-tenths of an ampere.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC for the KLKR series. The circuit operating voltage must remain within the applicable AC or DC rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-3\/10 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-3\/10 is a fast-acting fuse. It belongs to the KLKR series, which provides fast overload response. The KLDR series uses a different time-delay characteristic and is not automatically interchangeable.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-3\/10 replace a KLDR-3\/10 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both belong to the Class CC family and have the same nominal 0.3 A current rating, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on the circuit design, normal inrush current and required overcurrent response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-3\/10 suitable for solid-state electrical equipment?\u003c\/strong\u003e\u003cbr\u003eLittelfuse identifies solid-state components among the applications for the KLKR series. Suitability for a particular electronic device must be verified using its protection requirements, expected operating currents and the fuse time-current characteristics.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Littelfuse publish a specific I²t value for KLKR-3\/10?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR datasheet revised February 25, 2025 includes time-current curves covering the 3\/10 A rating but does not provide an individual numerical total clearing I²t value for KLKR.300 in its electrical specifications table. I²t values for other ampere ratings should not be substituted.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 13.61 g for ratings from 0.1 A through 1 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Confirm Class CC compatibility and the required voltage and electrical ratings before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-3\/10 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. The manufacturer also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-3\/10?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-3\/10 or KLKR.300 designation, 300 mA current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. Littelfuse lists KLKR.300T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"1pcs","offer_id":67902787125327,"sku":"LL1-LI-KLKR-3\/10*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"5pcs","offer_id":67902787158095,"sku":"LL1-LI-KLKR-3\/10*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"10pcs","offer_id":67902787190863,"sku":"LL1-LI-KLKR-3\/10*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"20pcs","offer_id":67902787223631,"sku":"LL1-LI-KLKR-3\/10*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-3_10-01.jpg?v=1793180909"},{"product_id":"littelfuse-klkr-1-2-fuse","title":"Littelfuse KLKR-1\/2 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-1\/2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLKR.500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Marking\u003c\/td\u003e\n\u003ctd\u003eKLKR 1\/2 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e0.5 A (500 mA, 1\/2 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e500 mA Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-1\/2 features a 0.5 ampere current rating, equivalent to 500 milliamperes or one-half ampere. This fractional-amperage rating supports applications requiring a specified low-current Class CC fast-acting fuse in industrial electrical equipment and control circuits.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides a fast-acting response to overload conditions for equipment requiring rapid circuit protection. Unlike the KLDR time-delay series, KLKR fuses are intended for applications where fast overload response is required. Normal startup and inrush currents must be considered when selecting a fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe fuse is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC ratings support protective-device selection according to circuit operating voltage, installation requirements and prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eProvides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC interrupting rating as manufacturer self-certified. Available prospective fault current must remain within the applicable interrupting capacity.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting construction helps reduce heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with corresponding Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Cartridge\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Compatible installation accessories include appropriately rated Littelfuse L60030C and LPSC\/LFPSC Touch-Safe fuse holder series.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits with compatible protection requirements\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-1\/2 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-1\/2?\u003c\/strong\u003e\u003cbr\u003eIt is a 0.5 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series, intended for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR.500. Littelfuse specifies the product marking KLKR 1\/2 A and lists KLKR.500T as the ordering number for a manufacturer 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-1\/2?\u003c\/strong\u003e\u003cbr\u003eThe current rating is 0.5 ampere, equivalent to 500 milliamperes or one-half of an ampere.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC for the KLKR series. The circuit operating voltage must remain within the applicable AC or DC rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/2 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-1\/2 is a fast-acting fuse. It belongs to the KLKR series, which provides fast overload response. The KLDR series uses a different time-delay characteristic and is not automatically interchangeable.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-1\/2 replace a KLDR-1\/2 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses with the same nominal 0.5 A current rating, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on circuit design, normal inrush current and required overcurrent response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/2 suitable for solid-state electrical equipment?\u003c\/strong\u003e\u003cbr\u003eLittelfuse identifies solid-state components among the applications for the KLKR series. Suitability for a particular electronic device must be verified using its protection requirements, expected operating currents and the fuse time-current characteristics.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Littelfuse publish a specific I²t value for KLKR-1\/2?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR datasheet revised February 25, 2025 does not provide an individual numerical total clearing I²t value for KLKR.500 in its electrical specifications table. I²t values from other ampere ratings should not be substituted.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 13.61 g for ratings from 0.1 A through 1 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Confirm Class CC compatibility and the required voltage and electrical ratings before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1\/2 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. The manufacturer also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-1\/2?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-1\/2 or KLKR.500 designation, 500 mA current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. Littelfuse lists KLKR.500T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67902837784655,"sku":"LL2-LI-KLKR-1\/2*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67902837751887,"sku":"LL2-LI-KLKR-1\/2*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67902837719119,"sku":"LL2-LI-KLKR-1\/2*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67902837817423,"sku":"LL2-LI-KLKR-1\/2*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-1_10-01.jpg?v=1793180192"},{"product_id":"littelfuse-klkr-1-fuse","title":"Littelfuse KLKR-1 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLKR001\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Marking\u003c\/td\u003e\n\u003ctd\u003eKLKR 1A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e1 A (1000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical (200,000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA (20,000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Clearing I²t\u003c\/td\u003e\n\u003ctd\u003e80 A²s (Manufacturer 200 kA Test Condition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss at 100% Rated Current\u003c\/td\u003e\n\u003ctd\u003e0.38 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss at 80% Rated Current\u003c\/td\u003e\n\u003ctd\u003e0.20 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Protection Function\u003c\/td\u003e\n\u003ctd\u003eFast Overload Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Circuit Protection\u003c\/td\u003e\n\u003ctd\u003eGeneral-Purpose Branch Circuit Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Format\u003c\/td\u003e\n\u003ctd\u003eClass CC Rejection-Style Cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e1 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-1 features a 1 ampere current rating, equivalent to 1000 milliamperes. It is designed for appropriately specified industrial control circuits and electrical equipment requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides a fast-acting response to overload conditions for electrical equipment requiring rapid circuit protection. Unlike the KLDR time-delay series, KLKR fuses are intended for applications where a fast overload response is required. Normal startup and inrush currents must be considered during fuse selection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe fuse is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC voltage ratings support protective-device selection according to circuit operating voltage, installation requirements and available prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eProvides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The available prospective fault current must remain within the applicable interrupting capacity.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting construction helps reduce the heating and magnetic effects associated with short-circuit currents. Rejection-style construction helps prevent the installation of fuses with insufficient voltage or interrupting ratings when used with corresponding Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003ePublished Electrical Performance\u003c\/h3\u003e\n\u003cp\u003eLittelfuse specifies a total clearing I²t of 80 A²s under the manufacturer's 200 kA test condition for KLKR001.T. Published power loss is 0.38 W at full rated current and 0.20 W at 80% rated current. The fuse uses a nominal 10.3 x 38.1 mm melamine-bodied cartridge with nickel-plated bronze end caps.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits with compatible protection requirements\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-1 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-1?\u003c\/strong\u003e\u003cbr\u003eIt is a 1 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series, intended for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR001. The product marking is KLKR 1A, and Littelfuse lists KLKR001.T as the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-1?\u003c\/strong\u003e\u003cbr\u003eThe current rating is 1 ampere, equivalent to 1000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC. The circuit operating voltage must remain within the applicable AC or DC rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-1 is a fast-acting fuse. It belongs to the KLKR series, which provides fast overload response. The KLDR series has a different time-delay characteristic and is not automatically interchangeable.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-1 replace a KLDR-1 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses rated at 1 A, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on the circuit design, expected inrush current and required overcurrent response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the total clearing I²t value for KLKR-1?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer specifies a total clearing I²t of 80 A²s for ordering number KLKR001.T under its 200 kA test condition. This value applies specifically to the 1 A rating and should not be substituted with data from other KLKR models.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the power loss of KLKR-1?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 0.38 W at 100% of rated current and 0.20 W at 80% of rated current. Actual operating conditions must be considered when evaluating heat dissipation in an enclosure or fuse holder.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body with nickel-plated bronze end caps. Littelfuse specifies a weight of 13.61 g for the 0.1 A through 1 A ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Confirm the selected holder has the required Class CC compatibility, voltage rating and electrical capacity before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-1 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-1?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-1 or KLKR001 designation, 1 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. Littelfuse lists KLKR001.T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67902940119119,"sku":"LL1-LI-KLKR-1*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67902940151887,"sku":"LL1-LI-KLKR-1*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67902940184655,"sku":"LL1-LI-KLKR-1*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67902940217423,"sku":"LL1-LI-KLKR-1*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-1_2-01.jpg?v=1793181116"},{"product_id":"littelfuse-klkr-2-fuse","title":"Littelfuse KLKR-2 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e2 A (2000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical (200,000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA (20,000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Protection Function\u003c\/td\u003e\n\u003ctd\u003eFast Overload Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Circuit Protection\u003c\/td\u003e\n\u003ctd\u003eGeneral-Purpose Branch Circuit Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Format\u003c\/td\u003e\n\u003ctd\u003eClass CC Rejection-Style Cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e2 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-2 provides a 2 ampere current rating, equivalent to 2000 milliamperes, for appropriately specified industrial electrical equipment, control circuits and branch circuit applications. Its current rating supports equipment requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series is designed for equipment requiring a fast response to overload conditions. Unlike the KLDR time-delay series, KLKR fuses provide fast-acting protection. Normal startup currents and temporary inrush conditions must be considered when selecting a fuse for a specific circuit.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eRated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC voltage ratings support protective-device selection according to operating voltage, application requirements and available prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. Available prospective fault current must remain within the applicable interrupting capacity.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting construction helps reduce heating and magnetic effects associated with short-circuit events. The rejection feature helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Cartridge\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Littelfuse specifies a series weight of 15.42 g for the 1.5 A through 30 A ratings. Compatible mounting accessories include appropriately rated L60030C and LPSC\/LFPSC Touch-Safe fuse holder series.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits with compatible protection requirements\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-2 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-2?\u003c\/strong\u003e\u003cbr\u003eIt is a 2 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series, designed for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR002. The product marking is KLKR 2A, and Littelfuse lists KLKR002.T as the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-2?\u003c\/strong\u003e\u003cbr\u003eThe current rating is 2 amperes, equivalent to 2000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC for the KLKR series. The circuit operating voltage must remain within the applicable AC or DC rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. The DC interrupting rating is identified by Littelfuse as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-2 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-2 is a fast-acting fuse. The KLKR series provides fast overload protection, whereas the KLDR series has time-delay characteristics. They should not be considered electrically identical.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-2 replace a KLDR-2 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Both products are Class CC fuses with a 2 A nominal current rating, but their operating characteristics differ. A replacement must meet the circuit requirements for inrush tolerance, overload response and fault protection.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-2 suitable for control transformer circuits?\u003c\/strong\u003e\u003cbr\u003eLittelfuse identifies control transformer circuits among the applications of the KLKR series when fast overload response is required. Selection must account for transformer magnetizing inrush and the applicable protection requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Littelfuse publish individual I²t and power-loss values for KLKR-2?\u003c\/strong\u003e\u003cbr\u003eThe KLKR datasheet revised February 25, 2025 provides numerical total clearing I²t and power-loss values for selected reference ratings but does not list separate numerical values for KLKR002.T. Values from other ampere ratings should not be substituted for the 2 A model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series uses a melamine body with nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Confirm Class CC compatibility and the required voltage and electrical ratings before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-2 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-2?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-2 or KLKR002 designation, 2 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. Littelfuse lists KLKR002.T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67917707280463,"sku":"LL1-LI-KLKR-2*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67917707313231,"sku":"LL1-LI-KLKR-2*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67917707345999,"sku":"LL1-LI-KLKR-2*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67917707378767,"sku":"LL1-LI-KLKR-2*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-2-01.jpg?v=1793257069"},{"product_id":"littelfuse-klkr-3-fuse","title":"Littelfuse KLKR-3 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e3 A (3000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical (200,000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA (20,000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Protection Function\u003c\/td\u003e\n\u003ctd\u003eFast Overload Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Circuit Protection\u003c\/td\u003e\n\u003ctd\u003eGeneral-Purpose Branch Circuit Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Format\u003c\/td\u003e\n\u003ctd\u003eClass CC Rejection-Style Cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e3 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-3 provides a 3 ampere current rating, equivalent to 3000 milliamperes, for appropriately specified industrial electrical equipment, control circuits and branch circuit applications. Its rating supports installations requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series is designed for circuits and equipment requiring a fast response to overload conditions. Unlike the KLDR time-delay series, KLKR fuses have fast-acting characteristics. Normal startup currents, transient loads and inrush conditions must be evaluated during protective-device selection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eRated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. The separate voltage ratings support fuse selection according to operating voltage, circuit design and the available prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies its DC interrupting rating as manufacturer self-certified. The available fault current must remain within the applicable interrupting rating.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eCurrent-limiting construction helps reduce the heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent the installation of fuses with insufficient voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Construction\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Littelfuse specifies a series weight of 15.42 g for the 1.5 A through 30 A ratings. Recommended accessories include compatible L60030C and LPSC\/LFPSC Touch-Safe fuse holder families.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial control circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eElectrical control panels with Class CC fuse holders\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring fast-acting overcurrent protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits with compatible protection requirements\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-3 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-3?\u003c\/strong\u003e\u003cbr\u003eIt is a 3 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and applications requiring a fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR003. Littelfuse specifies the product marking KLKR 3A and lists KLKR003.T as the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-3?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 3 amperes, equivalent to 3000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC for the KLKR series. The circuit operating voltage must remain within the applicable rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC interrupting rating as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-3 a fast-acting or time-delay fuse?\u003c\/strong\u003e\u003cbr\u003eKLKR-3 is a fast-acting fuse. It belongs to the KLKR series, which is designed for fast overload protection. The KLDR series has time-delay characteristics and should not be considered electrically identical.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-3 replace a KLDR-3 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Both are Class CC fuses with a nominal 3 A current rating, but they have different overload response characteristics. Replacement suitability depends on the protected circuit, expected inrush current and applicable protection requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-3 suitable for industrial control transformer circuits?\u003c\/strong\u003e\u003cbr\u003eLittelfuse identifies control transformer circuits among the KLKR series applications where fast overload response is required. The transformer's magnetizing inrush current, circuit design and protective-device coordination must be evaluated before selection.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Littelfuse specify an individual total clearing I²t value for KLKR-3?\u003c\/strong\u003e\u003cbr\u003eThe KLKR datasheet revised February 25, 2025 provides numerical total clearing I²t values for selected reference ratings but does not list an individual numerical value for KLKR003.T. Values for the 1 A, 6 A or other KLKR ratings must not be substituted for the 3 A model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series uses a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for the 1.5 A through 30 A ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe fuse holder series as accessories. Confirm the holder's Class CC compatibility, voltage rating and electrical capacity before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-3 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-3?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-3 or KLKR003 designation, 3 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristics, interrupting capacity, Class CC fuse-holder compatibility and desired purchase quantity. Littelfuse lists KLKR003.T as a manufacturer 10-piece pack ordering number; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67917730054223,"sku":"LL1-LI-KLKR-3*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67917730086991,"sku":"LL1-LI-KLKR-3*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67917730119759,"sku":"LL1-LI-KLKR-3*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67917730152527,"sku":"LL1-LI-KLKR-3*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-3-02.jpg?v=1793257438"},{"product_id":"littelfuse-klkr-4-fuse","title":"Littelfuse KLKR-4 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e4 A (4000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e4 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-4 features a 4 ampere current rating, equivalent to 4000 milliamperes. It is designed for appropriately specified industrial electrical equipment, control circuits and branch circuit applications requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for electrical circuits requiring a rapid response to overload conditions. Unlike the KLDR time-delay series, KLKR fuses are designed for fast overload response. Normal startup currents, temporary load changes and inrush conditions must be evaluated when selecting a fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe fuse is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC voltage ratings support protective-device selection according to circuit operating voltage, installation requirements and prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. Available prospective fault current must remain within the applicable interrupting capacity.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Cartridge\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Littelfuse specifies a series weight of 15.42 g for the 1.5 A through 30 A ratings. Compatible accessories include appropriately rated L60030C and LPSC\/LFPSC Touch-Safe fuse holder series.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial control circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits with compatible protection requirements\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-4 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-4?\u003c\/strong\u003e\u003cbr\u003eIt is a 4 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR004. The product marking is KLKR 4A, and Littelfuse lists KLKR004.T as the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-4?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 4 amperes, equivalent to 4000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC for the KLKR series. The circuit operating voltage must remain within the applicable AC or DC rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC interrupting rating as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-4 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-4 is a fast-acting fuse. It belongs to the KLKR series, which provides fast overload protection. The KLDR series has time-delay characteristics and should not be considered electrically identical.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-4 replace a KLDR-4 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses with a nominal 4 A current rating, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on circuit design, expected inrush current and the required overcurrent response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-4 suitable for industrial control panels?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is intended for general-purpose branch circuit protection and is used in OEM equipment and control panels. The 4 A fuse must be selected according to the equipment specifications, circuit voltage, expected load and protective-device coordination requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Littelfuse publish a specific I²t value for KLKR-4?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR datasheet revised February 25, 2025 does not provide an individual numerical total clearing I²t value for KLKR004.T in its ordering table. Values for other current ratings should not be substituted for the 4 A model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Confirm Class CC compatibility and the required voltage and electrical ratings before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-4 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-4?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-4 or KLKR004 designation, 4 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. Littelfuse lists KLKR004.T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67917765673039,"sku":"LL1-LI-KLKR-4*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67917765705807,"sku":"LL1-LI-KLKR-4*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67917765738575,"sku":"LL1-LI-KLKR-4*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67917765771343,"sku":"LL1-LI-KLKR-4*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-4-01.jpg?v=1793936846"},{"product_id":"littelfuse-klkr-5-fuse","title":"Littelfuse KLKR-5 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\" style=\"width: 99.9239%; height: 2235.52px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 44.3403px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 44.3403px;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 44.3403px;\"\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 44.3403px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 44.3403px;\"\u003eModel Number\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 44.3403px;\"\u003eKLKR-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eProduct Category\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 44.3403px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 44.3403px;\"\u003eProduct Series\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 44.3403px;\"\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 44.3403px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 44.3403px;\"\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 44.3403px;\"\u003e5 A (5000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 44.3403px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 44.3403px;\"\u003eFuse Class\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 44.3403px;\"\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eFuse Type\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003e200 kA RMS Symmetrical (200,000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 84.6181px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 84.6181px;\"\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 84.6181px;\"\u003e20 kA (20,000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 84.6181px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 84.6181px;\"\u003ePrimary Protection Function\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 84.6181px;\"\u003eFast Overload Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eIntended Circuit Protection\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003eGeneral-Purpose Branch Circuit Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eFuse Format\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003eClass CC Rejection-Style Cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4792px;\"\u003e\n\u003ctd style=\"width: 41.7284%; height: 64.4792px;\"\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd style=\"width: 57.6332%; height: 64.4792px;\"\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e5 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-5 features a 5 ampere current rating, equivalent to 5000 milliamperes. It is designed for appropriately specified industrial electrical equipment, control circuits and branch circuit applications requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for electrical circuits requiring a rapid response to overload conditions. Unlike the KLDR time-delay series, KLKR fuses are designed for fast overload response. Normal startup currents, temporary load changes and inrush conditions must be evaluated when selecting a fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe fuse is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC voltage ratings support protective-device selection according to circuit operating voltage, installation requirements and prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. Available prospective fault current must remain within the applicable interrupting capacity.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Cartridge\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Littelfuse specifies a series weight of 15.42 g for the 1.5 A through 30 A ratings. Compatible accessories include appropriately rated L60030C and LPSC\/LFPSC Touch-Safe fuse holder series.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial control circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits with compatible protection requirements\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-5 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-5?\u003c\/strong\u003e\u003cbr\u003eIt is a 5 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR005. The product marking is KLKR 5A, and Littelfuse lists KLKR005.T as the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-5?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 5 amperes, equivalent to 5000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC for the KLKR series. The circuit operating voltage must remain within the applicable AC or DC rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC interrupting rating as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-5 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-5 is a fast-acting fuse. It belongs to the KLKR series, which provides fast overload protection. The KLDR series has time-delay characteristics and should not be considered electrically identical.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-5 replace a KLDR-5 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses with a nominal 5 A current rating, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on circuit design, expected inrush current and the required overcurrent response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-5 suitable for industrial control panels?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is intended for general-purpose branch circuit protection and is used in OEM equipment and control panels. The 5 A fuse must be selected according to equipment specifications, circuit voltage, expected load and protective-device coordination requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Littelfuse publish a specific I²t value for KLKR-5?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR datasheet revised February 25, 2025 does not provide an individual numerical total clearing I²t value for KLKR005.T in its ordering table. Values for other current ratings should not be substituted for the 5 A model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Confirm Class CC compatibility and the required voltage and electrical ratings before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-5 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-5?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-5 or KLKR005 designation, 5 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. Littelfuse lists KLKR005.T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67917847035983,"sku":"LL1-LI-KLKR-5*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67917847068751,"sku":"LL1-LI-KLKR-5*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67917847101519,"sku":"LL1-LI-KLKR-5*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67917847134287,"sku":"LL1-LI-KLKR-5*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-5-01.jpg?v=1793258099"},{"product_id":"littelfuse-klkr-6-fuse","title":"Littelfuse KLKR-6 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e6 A (6000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.406 x 1.500 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e6 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-6 is a 6 ampere Class CC fuse designed for electrical circuits requiring a defined fast-acting overcurrent protection rating. Its current rating supports compatible industrial control equipment, branch circuits and OEM assemblies when selected according to the circuit design.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for circuits requiring a rapid response to overload conditions. Its operating characteristic differs from the time-delay Littelfuse KLDR series. Expected startup current, temporary load changes and inrush conditions should be evaluated before selecting a fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-6 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate voltage ratings support selection for suitable electrical installations. The circuit voltage and available prospective fault current must remain within the applicable ratings.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The fuse must be used within the applicable voltage and interrupting-capacity limits.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce the heating and magnetic effects associated with short-circuit currents. The rejection feature helps prevent installation of fuses with lower voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Construction\u003c\/h3\u003e\n\u003cp\u003eThe fuse features a melamine body, nickel-plated bronze end caps and a nominal cartridge size of 10.3 x 38.1 mm. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A. Compatible accessories include L60030C and LPSC\/LFPSC Touch-Safe fuse holder series.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eOEM equipment and electrical assemblies\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eElectronic equipment requiring compatible Class CC protection\u003c\/li\u003e\n\u003cli\u003eSolid-state devices requiring suitable fast-acting protection\u003c\/li\u003e\n\u003cli\u003eLighting and auxiliary circuits with compatible fuse requirements\u003c\/li\u003e\n\u003cli\u003eReplacement applications requiring the specified 6 A KLKR fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-6 Class CC Fast-Acting Fuse. If you need to make bulk purchases or inquire about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-6?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR-6 is a 6 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR006. The product marking is KLKR 6A, and KLKR006.T is the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 6 amperes, equivalent to 6000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is rated for 600 VAC and 300 VDC. The appropriate rating depends on the circuit type and operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe series has an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. The manufacturer identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-6 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-6 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-6 replace KLDR-6?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Both are Class CC fuse series, but KLKR is fast-acting and KLDR is time-delay. Confirm the circuit design, startup current, protective coordination and manufacturer requirements before choosing a replacement.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.406 x 1.500 inches. Confirm that the existing fuse holder supports the required Class CC format and electrical ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat materials are used in KLKR-6?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series uses a melamine body and nickel-plated bronze end caps. Littelfuse specifies a weight of 15.42 g for its 1.5 A through 30 A ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Littelfuse publish an individual I²t value for KLKR-6?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer ordering table identifies the KLKR006 model but does not provide a separate numerical total clearing I²t value for this specific rating. Values from other current ratings should not be substituted for KLKR-6.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are compatible?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Verify Class CC compatibility, operating voltage, interrupting capacity and the requirements of the electrical installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the KLKR series have UL and CSA certifications?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse datasheet identifies UL Listing under file E81895 and CSA Certification under file LR29862. It also lists Declaration of Conformity KLKR_210128_1 and RoHS compliance for the series.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-6?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-6 model designation, manufacturer catalog number KLKR006, 6 A rating, 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, compatible Class CC fuse holder and required pack quantity. KLKR006.T is listed as a 10-piece manufacturer ordering number; the quantity supplied by an individual seller should be checked separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"1PCS","offer_id":67917936492623,"sku":"LL1-LI-KLKR-6*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67917936525391,"sku":"LL1-LI-KLKR-6*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"10PCS","offer_id":67917936558159,"sku":"LL1-LI-KLKR-6*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67917936590927,"sku":"LL1-LI-KLKR-6*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-6-01.jpg?v=1793258478"},{"product_id":"littelfuse-klkr-7-fuse","title":"Littelfuse KLKR-7 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e7 A (7000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e7 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-7 features a 7 ampere current rating, equivalent to 7000 milliamperes. It is designed for appropriately specified electrical equipment, industrial control circuits and branch circuit applications requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for circuits requiring a rapid response to overload conditions. Its operating characteristics differ from the time-delay Littelfuse KLDR series. Expected startup currents, transient loads and inrush conditions should be evaluated when selecting a fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-7 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate voltage ratings support protective-device selection according to the circuit type and operating voltage. The available prospective fault current must remain within the applicable interrupting rating.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The fuse must be applied within the relevant voltage and interrupting-capacity limits.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce the heating and magnetic effects associated with short-circuit currents. Rejection-style construction helps prevent installation of fuses with insufficient ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Construction\u003c\/h3\u003e\n\u003cp\u003eThe fuse features a melamine body, nickel-plated bronze end caps and a nominal cartridge size of 10.3 x 38.1 mm. Its compact format supports compatible industrial panels and OEM assemblies. Confirm the fuse holder's Class CC compatibility and electrical ratings before installation.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eSolid-state devices requiring compatible fast-acting protection\u003c\/li\u003e\n\u003cli\u003eElectronic equipment requiring Class CC fuse protection\u003c\/li\u003e\n\u003cli\u003eLighting and auxiliary circuits with compatible fuse requirements\u003c\/li\u003e\n\u003cli\u003eReplacement applications requiring the specified 7 A KLKR fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-7 Class CC Fast-Acting Fuse. If you need to make bulk purchases or inquire about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-7?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR-7 is a 7 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR007. The product marking is KLKR 7A, and KLKR007.T is the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 7 amperes, equivalent to 7000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is rated for 600 VAC and 300 VDC. Select the appropriate rating according to the circuit type and operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe series has an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. The manufacturer identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-7 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-7 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-7 replace KLDR-7?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses with a 7 A current rating, KLKR is fast-acting while KLDR is time-delay. Confirm circuit requirements, startup current, protective coordination and manufacturer recommendations before choosing a replacement.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.406 x 1.500 inches. Confirm that the existing fuse holder supports the Class CC format and required electrical ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich equipment can use KLKR-7?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is intended for general-purpose branch circuit protection and is commonly specified for compatible OEM equipment, control panels and electronic circuits requiring fast-acting protection. The suitability of the 7 A rating must be established from the equipment and circuit requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the manufacturer publish a specific I²t value for KLKR-7?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer datasheet's electrical table lists numerical total clearing I²t values for selected current ratings but does not list a separate numerical value for KLKR007.T. Values from other current ratings should not be substituted for the 7 A model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are compatible?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Verify Class CC compatibility, operating voltage, interrupting capacity and the requirements of the electrical installation before use.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the KLKR series have UL and CSA certifications?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse datasheet identifies UL Listing under file E81895 and CSA Certification under file LR29862. The series documentation also identifies RoHS compliance and a manufacturer Declaration of Conformity.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-7?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-7 model designation, manufacturer catalog number KLKR007, 7 A current rating, 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, compatible Class CC fuse holder and required pack quantity. KLKR007.T is the manufacturer's 10-piece ordering number; confirm the actual selling quantity separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67918033354831,"sku":"LL1-LI-KLKR-7*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67918033387599,"sku":"LL1-LI-KLKR-7*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67918033420367,"sku":"LL1-LI-KLKR-7*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67918033453135,"sku":"LL1-LI-KLKR-7*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-6-01.jpg?v=1793258478"},{"product_id":"littelfuse-klkr-8-fuse","title":"Littelfuse KLKR-8 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e8 A (8000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.406 x 1.500 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e8 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-8 features an 8 ampere current rating, equivalent to 8000 milliamperes. It is designed for appropriately specified electrical equipment, industrial control circuits and branch circuit applications requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for circuits requiring a rapid response to overload conditions. Its operating characteristic differs from the time-delay Littelfuse KLDR series. Expected startup currents, transient loads and inrush conditions should be evaluated when selecting a fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-8 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate voltage ratings support protective-device selection according to circuit type and operating voltage. The available prospective fault current must remain within the applicable interrupting rating.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The fuse must be applied within the relevant voltage and interrupting-capacity limits.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce the heating and magnetic effects associated with short-circuit currents. Rejection-style construction helps prevent installation of fuses with insufficient ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Construction\u003c\/h3\u003e\n\u003cp\u003eThe fuse features a melamine body, nickel-plated bronze end caps and a nominal cartridge size of 10.3 x 38.1 mm. Its compact format supports compatible industrial panels and OEM assemblies. Confirm the fuse holder's Class CC compatibility and electrical ratings before installation.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eOEM equipment and electrical assemblies\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eSolid-state devices requiring compatible fast-acting protection\u003c\/li\u003e\n\u003cli\u003eElectronic equipment requiring Class CC fuse protection\u003c\/li\u003e\n\u003cli\u003eLighting and auxiliary circuits with compatible fuse requirements\u003c\/li\u003e\n\u003cli\u003eReplacement applications requiring the specified 8 A KLKR fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eFor bulk purchasing or inquiries about the Littelfuse KLKR-8 Class CC Fast-Acting Fuse, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-8?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR-8 is an 8 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR008. The product marking is KLKR 8A, and KLKR008.T is the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 8 amperes, equivalent to 8000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is rated for 600 VAC and 300 VDC. Select the appropriate rating according to the circuit type and operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe series has an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. The manufacturer identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-8 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-8 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-8 replace KLDR-8?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses with an 8 A current rating, KLKR is fast-acting while KLDR is time-delay. Confirm circuit requirements, startup current, protective coordination and manufacturer recommendations before choosing a replacement.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.406 x 1.500 inches. Confirm that the existing fuse holder supports the Class CC format and required electrical ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich equipment can use KLKR-8?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is intended for general-purpose branch circuit protection and is commonly specified for compatible OEM equipment, control panels and electronic circuits requiring fast-acting protection. Confirm that the 8 A rating meets the equipment and circuit requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the manufacturer publish a specific I²t value for KLKR-8?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer datasheet's electrical table provides numerical total clearing I²t values for selected current ratings but does not list a separate numerical value for KLKR008.T. Values from other current ratings should not be substituted for the 8 A model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are compatible?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC Touch-Safe holder series as accessories. Verify Class CC compatibility, operating voltage, interrupting capacity and the requirements of the electrical installation before use.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the KLKR series have UL and CSA certifications?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse datasheet identifies UL Listing under file E81895 and CSA Certification under file LR29862. The series documentation also identifies RoHS compliance and a Declaration of Conformity.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-8?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-8 model designation, manufacturer catalog number KLKR008, 8 A current rating, 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, compatible Class CC fuse holder and required pack quantity. KLKR008.T is the manufacturer's 10-piece ordering number; confirm the actual selling quantity separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67918077591631,"sku":"LL1-LI-KLKR-8*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67918077558863,"sku":"LL1-LI-KLKR-8*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67918077526095,"sku":"LL1-LI-KLKR-8*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67918077624399,"sku":"LL1-LI-KLKR-8*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/c819d168-b3b1-43de-b85c-e524cc61a3ed.png?v=1793937281"},{"product_id":"littelfuse-klkr-9-fuse","title":"Littelfuse KLKR-9 Class CC Fast-Acting Fuse","description":"\u003cstyle\u003e.nxs-industrial-product-page{--industrial-navy:#082f49;--industrial-blue:#0b4f7c;--industrial-blue-2:#0f6ea8;--industrial-blue-3:#1784c1;--industrial-cyan:#38bdf8;--steel-line:#c9dce9;--surface:#fff;--surface-soft:#f7fbfe;--text-main:#173042;--shadow-soft:0 10px 30px rgba(8,47,73,.08);--shadow-hover:0 16px 36px rgba(8,79,124,.15);--radius-lg:14px;--radius-md:10px}.nxs-industrial-product-page,.nxs-industrial-product-page *{margin:0;padding:0;box-sizing:border-box;font-family:Arial,Helvetica,sans-serif}.nxs-industrial-product-page{background-color:#f3f8fb;background-image:linear-gradient(180deg,#eef6fb 0,#f7fafc 320px,#eef3f7 100%),linear-gradient(rgba(15,110,168,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(15,110,168,.025) 1px,transparent 1px);background-size:auto,34px 34px,34px 34px;position:relative;isolation:isolate;overflow:hidden;color:var(--text-main);line-height:1.75;-webkit-font-smoothing:antialiased}.nxs-industrial-product-page 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h2::before{width:20px;flex-basis:20px}.nxs-industrial-product-page .spec-table{display:table;table-layout:fixed}.nxs-industrial-product-page .spec-table td{padding:11px 9px;font-size:13px;line-height:1.55;overflow-wrap:anywhere}.nxs-industrial-product-page .spec-table td:first-child{width:42%}.nxs-industrial-product-page .features{grid-template-columns:1fr;gap:12px}.nxs-industrial-product-page .card{padding:18px 17px}.nxs-industrial-product-page .card:hover{transform:none}.nxs-industrial-product-page .section ul{grid-template-columns:1fr;gap:9px}.nxs-industrial-product-page .section li{padding:11px 12px 11px 36px;font-size:14px}.nxs-industrial-product-page .section:last-of-type\u003ep{padding:16px 14px 16px 48px;font-size:14px}.nxs-industrial-product-page .section:last-of-type\u003ep::before{left:12px;top:15px;min-width:26px;height:26px;font-size:10px}}@media(prefers-reduced-motion:reduce){.nxs-industrial-product-page,.nxs-industrial-product-page *,.nxs-industrial-product-page *::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLKR009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Marking\u003c\/td\u003e\n\u003ctd\u003eKLKR 9A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e9 A (9000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical (200,000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA (20,000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Protection Function\u003c\/td\u003e\n\u003ctd\u003eFast Overload and Short-Circuit Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Circuit Protection\u003c\/td\u003e\n\u003ctd\u003eGeneral-Purpose Branch Circuit Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Format\u003c\/td\u003e\n\u003ctd\u003eClass CC Rejection-Style Cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.406 x 1.500 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e9 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-9 features a 9 ampere current rating, equivalent to 9000 milliamperes. It is designed for appropriately specified industrial electrical equipment, control circuits and branch circuit applications requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for electrical circuits requiring a rapid response to overload conditions. Unlike the time-delay Littelfuse KLDR series, KLKR fuses are designed for fast overload response. Expected startup currents, transient loads and inrush conditions should be evaluated when selecting a fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-9 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate voltage ratings support protective-device selection according to circuit type, operating voltage and prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The available fault current must remain within the applicable interrupting rating.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce the heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Construction\u003c\/h3\u003e\n\u003cp\u003eThe fuse features a melamine body, nickel-plated bronze end caps and a nominal cartridge size of 10.3 x 38.1 mm. Its compact format supports compatible industrial panels and OEM assemblies. Confirm the fuse holder's Class CC compatibility and electrical ratings before installation.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eOEM equipment and electrical assemblies\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eSolid-state devices requiring compatible fast-acting protection\u003c\/li\u003e\n\u003cli\u003eElectronic equipment requiring Class CC fuse protection\u003c\/li\u003e\n\u003cli\u003eLighting and auxiliary circuits with compatible fuse requirements\u003c\/li\u003e\n\u003cli\u003eReplacement applications requiring the specified 9 A KLKR fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-9 Class CC Fast-Acting Fuse. If you need to make bulk purchases or inquire about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-9?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR-9 is a 9 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR009. The product marking is KLKR 9A, and KLKR009.T is the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 9 amperes, equivalent to 9000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is rated for 600 VAC and 300 VDC. Select the appropriate rating according to the circuit type and operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe series has an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. The manufacturer identifies the DC rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-9 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-9 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-9 replace KLDR-9?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses with a 9 A current rating, KLKR is fast-acting while KLDR is time-delay. Confirm circuit requirements, startup current, protective coordination and manufacturer recommendations before choosing a replacement.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.406 x 1.500 inches. Confirm that the existing fuse holder supports the Class CC format and required electrical ratings.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich equipment can use KLKR-9?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is intended for general-purpose branch circuit protection and is commonly specified for compatible OEM equipment, industrial control panels and electronic circuits requiring fast-acting protection. Confirm that the 9 A rating meets the equipment and circuit requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the manufacturer publish a specific I²t value for KLKR-9?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR datasheet provides numerical total clearing I²t values for selected current ratings but does not list a separate numerical value for KLKR009.T in its electrical specifications table. Values from other current ratings should not be substituted for the 9 A model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are compatible?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Verify Class CC compatibility, operating voltage, interrupting capacity and the requirements of the electrical installation before use.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the KLKR series have UL and CSA certifications?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse datasheet identifies UL Listing under file E81895 and CSA Certification under file LR29862. The series documentation also identifies RoHS compliance and Declaration of Conformity KLKR_210128_1.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-9?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-9 model designation, manufacturer catalog number KLKR009, 9 A current rating, 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, compatible Class CC fuse holder and required pack quantity. KLKR009.T is the manufacturer's 10-piece ordering number; confirm the actual selling quantity separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67918102331471,"sku":"LL1-LI-KLKR-9*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67918102364239,"sku":"LL1-LI-KLKR-9*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67918102397007,"sku":"LL1-LI-KLKR-9*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67918102429775,"sku":"LL1-LI-KLKR-9*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-9-01.jpg?v=1793259655"},{"product_id":"littelfuse-klkr-10-fuse","title":"Littelfuse KLKR-10 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLKR010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Marking\u003c\/td\u003e\n\u003ctd\u003eKLKR 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e10 A (10000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e10 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-10 provides a 10 ampere current rating, equivalent to 10000 milliamperes. It is designed for appropriately specified industrial electrical equipment, control circuits and general-purpose branch circuit applications requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for electrical circuits requiring a rapid response to overload conditions. Unlike the Littelfuse KLDR time-delay series, KLKR fuses are intended for applications requiring fast overload protection. Expected startup currents and temporary inrush conditions must be evaluated during fuse selection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-10 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC voltage ratings support protective-device selection according to operating voltage, circuit requirements and available prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. Available prospective fault current must remain within the applicable interrupting capacity.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003ePublished Electrical Performance\u003c\/h3\u003e\n\u003cp\u003eLittelfuse specifies a total clearing I²t of 344 A²s at its 200 kA test condition and a power loss of 1.56 W at 100% rated current for KLKR010.T. The fuse uses a melamine body, nickel-plated bronze caps and a nominal 10.3 x 38.1 mm cartridge format.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial control circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits suitable for fast-acting fuses\u003c\/li\u003e\n\u003cli\u003eSolid-state component circuits with compatible protection requirements\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in compatible Class CC fuse holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-10 Class CC Fast-Acting Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Please verify the required model, current rating and purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-10?\u003c\/strong\u003e\u003cbr\u003eIt is a 10 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series, intended for general-purpose branch circuit protection and applications requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR010. The product marking is KLKR 10A, and Littelfuse lists KLKR010.T as its manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating of KLKR-10?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 10 amperes, equivalent to 10000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies 600 VAC and 300 VDC for the KLKR series. The circuit operating voltage must remain within the applicable AC or DC rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC interrupting rating as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-10 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-10 is a fast-acting fuse. It belongs to the KLKR series, which is designed for fast overload protection. The KLDR series has different time-delay characteristics and should not be considered electrically identical.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-10 replace a KLDR-10 fuse?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses rated at 10 A, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on circuit design, normal inrush current, overload response and protective-device coordination requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the total clearing I²t value of KLKR-10?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a total clearing I²t of 344 A²s for KLKR010.T under the manufacturer's 200 kA test condition. This value is specific to the 10 A rating and must not be substituted with data from another KLKR model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the power loss at rated current?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a power loss of 1.56 W at 100% rated current for KLKR010.T. The manufacturer's electrical table does not specify a numerical power-loss value at 80% rated current for this model. Consider the applicable operating conditions when evaluating fuse-holder heat dissipation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.41 x 1.50 inches. The KLKR series uses a melamine body and nickel-plated bronze caps. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe fuse holder series as accessories. Verify Class CC compatibility and the required electrical ratings before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-10 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering KLKR-10?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-10 or KLKR010 designation, 10 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse-holder compatibility and desired purchase quantity. Littelfuse lists KLKR010.T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67918127693903,"sku":"LL1-LI-KLKR-10*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67918127726671,"sku":"LL1-LI-KLKR-10*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67918127759439,"sku":"LL1-LI-KLKR-10*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67918127792207,"sku":"LL1-LI-KLKR-10*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-6-01.jpg?v=1793258478"},{"product_id":"littelfuse-klkr-12-fuse","title":"Littelfuse KLKR-12 Class CC Fast-Acting 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h2::before{width:20px;flex-basis:20px}.nxs-industrial-product-page .spec-table{display:table;table-layout:fixed}.nxs-industrial-product-page .spec-table td{padding:11px 9px;font-size:13px;line-height:1.55;overflow-wrap:anywhere}.nxs-industrial-product-page .spec-table td:first-child{width:42%}.nxs-industrial-product-page .features{grid-template-columns:1fr;gap:12px}.nxs-industrial-product-page .card{padding:18px 17px}.nxs-industrial-product-page .card:hover{transform:none}.nxs-industrial-product-page .section ul{grid-template-columns:1fr;gap:9px}.nxs-industrial-product-page .section li{padding:11px 12px 11px 36px;font-size:14px}.nxs-industrial-product-page .section:last-of-type\u003ep{padding:16px 14px 16px 48px;font-size:14px}.nxs-industrial-product-page .section:last-of-type\u003ep::before{left:12px;top:15px;min-width:26px;height:26px;font-size:10px}}@media(prefers-reduced-motion:reduce){.nxs-industrial-product-page,.nxs-industrial-product-page *,.nxs-industrial-product-page *::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e12 A (12000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Dimensions\u003c\/td\u003e\n\u003ctd\u003e10.3 x 38.1 mm (0.41 x 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eMelamine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e12 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-12 features a 12 ampere current rating, equivalent to 12000 milliamperes. It is designed for appropriately specified industrial electrical equipment, control circuits and branch circuit applications requiring Class CC fast-acting overcurrent protection.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for electrical circuits requiring a rapid response to overload conditions. Unlike the time-delay Littelfuse KLDR series, KLKR fuses are intended for fast overload protection. Expected startup currents, temporary load changes and inrush conditions must be evaluated when selecting a fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-12 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate voltage ratings support protective-device selection according to circuit type, operating voltage and available prospective short-circuit current.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. Available prospective fault current must remain within the applicable interrupting capacity.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003ePublished Electrical Performance\u003c\/h3\u003e\n\u003cp\u003eLittelfuse specifies a total clearing I²t of 350 A²s at its 200 kA test condition, power loss of 1.58 W at 100% rated current and 0.83 W at 80% rated current for KLKR012.T. The fuse features a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast overload response\u003c\/li\u003e\n\u003cli\u003eSolid-state devices requiring compatible fast-acting protection\u003c\/li\u003e\n\u003cli\u003eElectronic equipment requiring Class CC fuse protection\u003c\/li\u003e\n\u003cli\u003eLighting and auxiliary circuits with compatible fuse requirements\u003c\/li\u003e\n\u003cli\u003eReplacement applications requiring the specified 12 A KLKR fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-12 Class CC Fast-Acting Fuse. If you need to make bulk purchases or inquire about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-12?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR-12 is a 12 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR012. The product marking is KLKR 12A, and KLKR012.T is the manufacturer's ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 12 amperes, equivalent to 12000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is rated for 600 VAC and 300 VDC. Select the applicable rating according to the circuit type and operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200 kA RMS symmetrical, and the DC interrupting rating is 20 kA. Littelfuse identifies the DC interrupting rating as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-12 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-12 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-12 replace KLDR-12?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses rated at 12 A, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on circuit design, expected inrush current, overload response and protective-device coordination requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the total clearing I²t value?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a total clearing I²t of 350 A²s for KLKR012.T under the manufacturer's 200 kA test condition. This value is specific to the 12 A rating and should not be substituted with data from another KLKR model.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the power loss at rated current?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a power loss of 1.58 W at 100% rated current and 0.83 W at 80% rated current for KLKR012.T. These values can help evaluate operating heat dissipation when selecting a compatible fuse holder and designing an electrical panel.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.41 x 1.50 inches. The KLKR series uses a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are recommended?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe fuse holder series as accessories. Verify Class CC compatibility, operating voltage and applicable electrical ratings before installation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-12 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse identifies the series as RoHS compliant and provides manufacturer conformity documentation. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-12?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-12 or KLKR012 designation, 12 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse-holder compatibility and desired purchase quantity. KLKR012.T is the manufacturer's 10-piece ordering number; confirm the actual selling quantity separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"1PCS","offer_id":67918160527439,"sku":"LL1-LI-KLKR-12*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67918160560207,"sku":"LL1-LI-KLKR-12*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"10PCS","offer_id":67918160592975,"sku":"LL1-LI-KLKR-12*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67918160625743,"sku":"LL1-LI-KLKR-12*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-12-01.jpg?v=1793260222"},{"product_id":"littelfuse-klkr-15-fuse","title":"Littelfuse KLKR-15 Class CC Fast-Acting 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*::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e15 A (15000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical (200,000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA (20,000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Clearing I²t\u003c\/td\u003e\n\u003ctd\u003e314 A²s at 200 kA Test Condition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss at 100% Rated Current\u003c\/td\u003e\n\u003ctd\u003e2.30 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss at 80% Rated Current\u003c\/td\u003e\n\u003ctd\u003e1.37 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e15 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-15 features a 15 ampere current rating, equivalent to 15000 milliamperes. It is designed for appropriately rated industrial electrical equipment, control panels and branch circuits requiring Class CC fast-acting overcurrent protection. Verify the circuit's design current and protective coordination before selecting the fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for circuits requiring a rapid response to overload conditions. Its operating characteristics differ from those of the time-delay Littelfuse KLDR series. Evaluate equipment startup current, temporary overloads and inrush conditions to ensure the fuse is suitable for the application.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-15 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate ratings support selection for appropriate electrical installations. The operating voltage, circuit configuration and available prospective fault current must remain within the applicable limits.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. Confirm that the available fault current does not exceed the applicable interrupting rating for the circuit.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce the heating and magnetic effects associated with short-circuit currents. The rejection feature helps prevent the use of inadequately rated fuses when installed with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003ePublished Electrical Performance\u003c\/h3\u003e\n\u003cp\u003eLittelfuse specifies a total clearing I²t of 314 A²s at the 200 kA test condition, power loss of 2.30 W at 100% rated current and 1.37 W at 80% rated current for KLKR015.T. The fuse has a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast-acting overcurrent protection\u003c\/li\u003e\n\u003cli\u003eSolid-state devices requiring compatible fast-acting protection\u003c\/li\u003e\n\u003cli\u003eElectronic equipment requiring Class CC fuse protection\u003c\/li\u003e\n\u003cli\u003eLighting and auxiliary circuits with compatible fuse requirements\u003c\/li\u003e\n\u003cli\u003eReplacement applications requiring the specified 15 A KLKR fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-15 Class CC Fast-Acting Fuse. For bulk purchases or inquiries about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-15?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR-15 is a 15 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR015. The product marking is KLKR 15A, and KLKR015.T is the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 15 amperes, equivalent to 15000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is rated for 600 VAC and 300 VDC. Choose the applicable rating according to the circuit type and operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe series has an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the total clearing I²t value?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer datasheet specifies a total clearing I²t of 314 A²s for KLKR015.T under the 200 kA test condition. This value is specific to the 15 A model and should not be replaced with data from another current rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the power loss at rated current?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a power loss of 2.30 W at 100% rated current and 1.37 W at 80% rated current for KLKR015.T. These values can help evaluate operating heat dissipation when selecting a compatible fuse holder and designing an electrical panel.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-15 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-15 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-15 replace KLDR-15?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses rated at 15 A, KLKR is fast-acting while KLDR is time-delay. Confirm circuit requirements, startup current, protective coordination and manufacturer recommendations before selecting a replacement.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.406 x 1.500 inches. The KLKR series uses a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for the applicable current-rating range.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are compatible?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Verify Class CC compatibility, operating voltage, interrupting capacity and the requirements of the electrical installation before use.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the KLKR series have UL and CSA certifications?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer datasheet identifies UL Listing under file E81895 and CSA Certification under file LR29862. The series documentation also identifies CE conformity documentation and RoHS compliance.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-15?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-15 model designation, manufacturer catalog number KLKR015, 15 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, compatible Class CC fuse holder and required pack quantity. KLKR015.T is the manufacturer's 10-piece ordering number; verify the quantity supplied by the individual seller separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67918201815119,"sku":"LL1-LI-KLKR-15*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67918201847887,"sku":"LL1-LI-KLKR-15*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67918201880655,"sku":"LL1-LI-KLKR-15*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67918201913423,"sku":"LL1-LI-KLKR-15*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-12-01.jpg?v=1793260222"},{"product_id":"littelfuse-klkr-20-fuse","title":"Littelfuse KLKR-20 Class CC Fast-Acting 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h2::before{width:20px;flex-basis:20px}.nxs-industrial-product-page .spec-table{display:table;table-layout:fixed}.nxs-industrial-product-page .spec-table td{padding:11px 9px;font-size:13px;line-height:1.55;overflow-wrap:anywhere}.nxs-industrial-product-page .spec-table td:first-child{width:42%}.nxs-industrial-product-page .features{grid-template-columns:1fr;gap:12px}.nxs-industrial-product-page .card{padding:18px 17px}.nxs-industrial-product-page .card:hover{transform:none}.nxs-industrial-product-page .section ul{grid-template-columns:1fr;gap:9px}.nxs-industrial-product-page .section li{padding:11px 12px 11px 36px;font-size:14px}.nxs-industrial-product-page .section:last-of-type\u003ep{padding:16px 14px 16px 48px;font-size:14px}.nxs-industrial-product-page .section:last-of-type\u003ep::before{left:12px;top:15px;min-width:26px;height:26px;font-size:10px}}@media(prefers-reduced-motion:reduce){.nxs-industrial-product-page,.nxs-industrial-product-page *,.nxs-industrial-product-page *::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLKR020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e20 A (20000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical (200000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA (20000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Clearing I²t\u003c\/td\u003e\n\u003ctd\u003e900 A²s at 200 kA Test Condition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss at 100% Rated Current\u003c\/td\u003e\n\u003ctd\u003e2.30 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss at 80% Rated Current\u003c\/td\u003e\n\u003ctd\u003e1.39 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e20 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-20 features a 20 ampere current rating, equivalent to 20000 milliamperes. It is designed for appropriately rated industrial electrical equipment, control panels and branch circuits requiring Class CC fast-acting overcurrent protection. Verify the circuit design current and protective coordination before selecting the fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for circuits requiring a rapid response to overload conditions. Its operating characteristics differ from those of the time-delay Littelfuse KLDR series. Evaluate equipment startup current, temporary overloads and inrush conditions to ensure the fuse is suitable for the application.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-20 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate ratings support selection for appropriate electrical installations. The operating voltage, circuit configuration and available prospective fault current must remain within the applicable limits.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. Confirm that the available fault current does not exceed the applicable interrupting rating for the circuit.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce the heating and magnetic effects associated with short-circuit currents. The rejection feature helps prevent the use of inadequately rated fuses when installed with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003ePublished Electrical Performance\u003c\/h3\u003e\n\u003cp\u003eLittelfuse specifies a total clearing I²t of 900 A²s at the 200 kA test condition, power loss of 2.30 W at 100% rated current and 1.39 W at 80% rated current for KLKR020.T. The fuse has a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast-acting overcurrent protection\u003c\/li\u003e\n\u003cli\u003eSolid-state devices requiring compatible fast-acting protection\u003c\/li\u003e\n\u003cli\u003eElectronic equipment requiring Class CC fuse protection\u003c\/li\u003e\n\u003cli\u003eLighting and auxiliary circuits with compatible fuse requirements\u003c\/li\u003e\n\u003cli\u003eReplacement applications requiring the specified 20 A KLKR fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-20 Class CC Fast-Acting Fuse. For bulk purchases or inquiries about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-20?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR-20 is a 20 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR020. The product marking is KLKR 20A, and KLKR020.T is the manufacturer ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 20 amperes, equivalent to 20000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is rated for 600 VAC and 300 VDC. Choose the applicable rating according to the circuit type and operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe series has an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the total clearing I²t value?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer datasheet specifies a total clearing I²t of 900 A²s for KLKR020.T under the 200 kA test condition. This value is specific to the 20 A model and should not be replaced with data from another current rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the power loss at rated current?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a power loss of 2.30 W at 100% rated current and 1.39 W at 80% rated current for KLKR020.T. These values can help evaluate operating heat dissipation when selecting a compatible fuse holder and designing an electrical panel.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-20 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-20 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-20 replace KLDR-20?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses rated at 20 A, KLKR is fast-acting while KLDR is time-delay. Confirm circuit requirements, startup current, protective coordination and manufacturer recommendations before selecting a replacement.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.406 x 1.500 inches. The KLKR series uses a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for the applicable current-rating range.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are compatible?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Verify Class CC compatibility, operating voltage, interrupting capacity and the requirements of the electrical installation before use.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the KLKR series have UL and CSA certifications?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer datasheet identifies UL Listing under file E81895 and CSA Certification under file LR29862. The series documentation also identifies CE conformity documentation and RoHS compliance. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-20?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-20 model designation, manufacturer catalog number KLKR020, 20 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, compatible Class CC fuse holder and required pack quantity. KLKR020.T is the manufacturer's 10-piece ordering number; verify the quantity supplied by the individual seller separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67918224228431,"sku":"LL1-LI-KLKR-20*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67918224261199,"sku":"LL1-LI-KLKR-20*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67918224293967,"sku":"LL1-LI-KLKR-20*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67918224326735,"sku":"LL1-LI-KLKR-20*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-20-01.jpg?v=1793260822"},{"product_id":"littelfuse-klkr-30-fuse","title":"Littelfuse KLKR-30 Class CC Fast-Acting 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h2::before{width:20px;flex-basis:20px}.nxs-industrial-product-page .spec-table{display:table;table-layout:fixed}.nxs-industrial-product-page .spec-table td{padding:11px 9px;font-size:13px;line-height:1.55;overflow-wrap:anywhere}.nxs-industrial-product-page .spec-table td:first-child{width:42%}.nxs-industrial-product-page .features{grid-template-columns:1fr;gap:12px}.nxs-industrial-product-page .card{padding:18px 17px}.nxs-industrial-product-page .card:hover{transform:none}.nxs-industrial-product-page .section ul{grid-template-columns:1fr;gap:9px}.nxs-industrial-product-page .section li{padding:11px 12px 11px 36px;font-size:14px}.nxs-industrial-product-page .section:last-of-type\u003ep{padding:16px 14px 16px 48px;font-size:14px}.nxs-industrial-product-page .section:last-of-type\u003ep::before{left:12px;top:15px;min-width:26px;height:26px;font-size:10px}}@media(prefers-reduced-motion:reduce){.nxs-industrial-product-page,.nxs-industrial-product-page *,.nxs-industrial-product-page *::before,.nxs-industrial-product-page *::after{transition:none!important}}\u003c\/style\u003e\n\u003cdiv class=\"nxs-industrial-product-page\"\u003e\n\u003cdiv class=\"container\"\u003e\u003cmain\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eLittelfuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eKLKR-30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Fast-Acting Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLKR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e30 A (30000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e600 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e300 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Class\u003c\/td\u003e\n\u003ctd\u003eUL Class CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Characteristic\u003c\/td\u003e\n\u003ctd\u003eFast-Acting (Fast-Blow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003eCurrent-Limiting Cartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e200 kA RMS Symmetrical (200000 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Interrupting Rating\u003c\/td\u003e\n\u003ctd\u003e20 kA (20000 A, Manufacturer Self-Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Clearing I²t\u003c\/td\u003e\n\u003ctd\u003e1720 A²s at 200 kA Test Condition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss at 100% Rated Current\u003c\/td\u003e\n\u003ctd\u003e3.75 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss at 80% Rated Current\u003c\/td\u003e\n\u003ctd\u003e2.10 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e30 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLKR-30 provides a 30 ampere current rating, equivalent to 30000 milliamperes. It is designed for appropriately rated industrial electrical equipment, control panels and branch circuits requiring Class CC fast-acting overcurrent protection. Verify the circuit design current and protective coordination before selecting the fuse.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eFast-Acting Overload Response\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides fast-acting protection for circuits requiring a rapid response to overload conditions. Its operating characteristics differ from those of the time-delay Littelfuse KLDR series. Evaluate equipment startup current, temporary overloads and inrush conditions to ensure the fuse is suitable for the application.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003e600 VAC and 300 VDC Ratings\u003c\/h3\u003e\n\u003cp\u003eThe KLKR-30 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate ratings support selection for appropriate electrical installations. The operating voltage, circuit configuration and available prospective fault current must remain within the applicable limits.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eThe KLKR series provides an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. Confirm that the available fault current does not exceed the applicable interrupting rating for the circuit.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Protection\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce the heating and magnetic effects associated with short-circuit currents. The rejection feature helps prevent the use of inadequately rated fuses when installed with compatible Class CC rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003ePublished Electrical Performance\u003c\/h3\u003e\n\u003cp\u003eLittelfuse specifies a total clearing I²t of 1720 A²s at the 200 kA test condition, power loss of 3.75 W at 100% rated current and 2.10 W at 80% rated current for KLKR030.T. The fuse has a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose industrial branch circuit protection\u003c\/li\u003e\n\u003cli\u003eIndustrial electrical control panels\u003c\/li\u003e\n\u003cli\u003eOEM electrical equipment and assemblies\u003c\/li\u003e\n\u003cli\u003eControl circuits requiring fast-acting overcurrent protection\u003c\/li\u003e\n\u003cli\u003eSolid-state components requiring compatible fast-acting protection\u003c\/li\u003e\n\u003cli\u003eLighting circuits requiring Class CC fuse protection\u003c\/li\u003e\n\u003cli\u003eControl transformer circuits with compatible fuse requirements\u003c\/li\u003e\n\u003cli\u003eReplacement applications requiring the specified 30 A KLKR fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003ePurchase Information\u003c\/h2\u003e\n\u003cp\u003eWe support online purchase of the Littelfuse KLKR-30 Class CC Fast-Acting Fuse. For bulk purchases or inquiries about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the Littelfuse KLKR-30?\u003c\/strong\u003e\u003cbr\u003eThe Littelfuse KLKR-30 is a 30 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer catalog number is KLKR030. The product marking is KLKR 30A, and KLKR030.T is the manufacturer's ordering number for a 10-piece pack.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 30 amperes, equivalent to 30000 milliamperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe KLKR series is rated for 600 VAC and 300 VDC. Choose the applicable rating according to the circuit type and operating voltage.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe series has an AC interrupting rating of 200 kA RMS symmetrical and a DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the total clearing I²t value?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer datasheet specifies a total clearing I²t of 1720 A²s for KLKR030.T under the 200 kA test condition. This value is specific to the 30 A model and should not be replaced with data from another current rating.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the power loss at rated current?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a power loss of 3.75 W at 100% rated current and 2.10 W at 80% rated current for KLKR030.T. These values can help evaluate operating heat dissipation when selecting a compatible fuse holder and designing an electrical panel.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLKR-30 fast-acting or time-delay?\u003c\/strong\u003e\u003cbr\u003eKLKR-30 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan KLKR-30 replace KLDR-30?\u003c\/strong\u003e\u003cbr\u003eNot automatically. Although both are Class CC fuses rated at 30 A, KLKR is fast-acting while KLDR is time-delay. Confirm circuit requirements, startup current, protective coordination and manufacturer recommendations before selecting a replacement.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions and construction materials?\u003c\/strong\u003e\u003cbr\u003eThe nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.406 x 1.500 inches. The KLKR series uses a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhich fuse holders are compatible?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists the L60030C and LPSC\/LFPSC Touch-Safe holder series as accessories. Verify Class CC compatibility, operating voltage, interrupting capacity and the requirements of the electrical installation before use.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the KLKR series have UL and CSA certifications?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer datasheet identifies UL Listing under file E81895 and CSA Certification under file LR29862. The series documentation also identifies CE conformity documentation and RoHS compliance. The DC interrupting rating is separately manufacturer self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be checked before ordering KLKR-30?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLKR-30 model designation, manufacturer catalog number KLKR030, 30 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, compatible Class CC fuse holder and required pack quantity. KLKR030.T is the manufacturer's 10-piece ordering number; verify the quantity supplied by the individual seller separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"10PCS","offer_id":67918250082383,"sku":"LL1-LI-KLKR-30*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67918250115151,"sku":"LL1-LI-KLKR-30*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67918250147919,"sku":"LL1-LI-KLKR-30*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67918250180687,"sku":"LL1-LI-KLKR-30*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLKR-9-01.jpg?v=1793259655"}],"url":"https:\/\/yunshuotrade.com\/collections\/littelfuse-klkr-series-fuses.oembed","provider":"yunshuotrade","version":"1.0","type":"link"}