{"product_id":"littelfuse-klkr-1-2-fuse","title":"Littelfuse KLKR-1\/2 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-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","url":"https:\/\/yunshuotrade.com\/products\/littelfuse-klkr-1-2-fuse","provider":"yunshuotrade","version":"1.0","type":"link"}