{"product_id":"littelfuse-klkr-12-fuse","title":"Littelfuse KLKR-12 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 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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-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","url":"https:\/\/yunshuotrade.com\/products\/littelfuse-klkr-12-fuse","provider":"yunshuotrade","version":"1.0","type":"link"}