{"product_id":"littelfuse-klkr-20-fuse","title":"Littelfuse KLKR-20 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-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","url":"https:\/\/yunshuotrade.com\/products\/littelfuse-klkr-20-fuse","provider":"yunshuotrade","version":"1.0","type":"link"}