{"product_id":"littelfuse-kldr-1-4-fuse","title":"Littelfuse KLDR-1\/4 Class CC Time-Delay 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-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 100%),linear-gradient(rgba(15,110,168,0.025) 1px,transparent 1px),linear-gradient(90deg,rgba(15,110,168,0.025) 1px,transparent 1px);background-size:auto,34px 34px,34px 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(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\u003eKLDR-1\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Category\u003c\/td\u003e\n\u003ctd\u003eClass CC Time-Delay Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePOWR-GARD KLDR\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\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\u003e0.25 A Low-Current Protection\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLDR-1\/4 provides a 0.25 ampere current rating for appropriately designed low-current industrial control circuits and inductive loads. Its 250 mA rating is suitable where quarter-ampere Class CC protection is specified.\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 electrical circuits up to 600 VAC or 300 VDC. Littelfuse publishes separate AC and DC voltage and interrupting ratings, allowing the fuse to be evaluated for suitable industrial AC and DC applications.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eTime-Delay Characteristics\u003c\/h3\u003e\n\u003cp\u003eDesigned to accommodate temporary magnetizing current surges from control transformers, solenoids and similar inductive components. The UL opening-time requirement specifies a minimum of 12 seconds at 200% of rated current rather than a fixed clearing time.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eProvides a 200 kA RMS symmetrical AC interrupting rating and a separately specified 20 kA DC interrupting rating. Littelfuse identifies the DC rating as self-certified. Circuit selection must account for available prospective fault current and the applicable voltage rating.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCurrent-Limiting Class CC Construction\u003c\/h3\u003e\n\u003cp\u003eThe current-limiting design helps reduce thermal and magnetic effects during short circuits. Its rejection feature helps prevent installation of unsuitable lower-voltage or lower-interrupting-rated fuses when used with corresponding rejection-type fuse holders.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle class=\"card\"\u003e\n\u003ch3\u003eCompact Industrial Fuse Design\u003c\/h3\u003e\n\u003cp\u003eFeatures a melamine body and nickel-plated bronze caps in a nominal 10.3 x 38.1 mm cartridge format. Compatible mounting options include appropriately rated Littelfuse L60030C and LPSC\/LFPSC Class CC fuse holders.\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\u003eIndustrial control transformer protection\u003c\/li\u003e\n\u003cli\u003eSolenoid circuit overcurrent protection\u003c\/li\u003e\n\u003cli\u003eLow-current inductive control circuits\u003c\/li\u003e\n\u003cli\u003eIndustrial control panels using Class CC fuses\u003c\/li\u003e\n\u003cli\u003eCompatible motor branch circuits with IEC motor controllers\u003c\/li\u003e\n\u003cli\u003eMotor control circuits with suitable NEMA contactors\u003c\/li\u003e\n\u003cli\u003eCompatible 600 VAC and 300 VDC control circuits\u003c\/li\u003e\n\u003cli\u003eExact-rating replacement in suitable 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 KLDR-1\/4 Class CC Time-Delay 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. Confirm the required purchase quantity and packaging configuration 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 KLDR-1\/4?\u003c\/strong\u003e\u003cbr\u003eIt is a 0.25 A Class CC time-delay, current-limiting cartridge fuse in the Littelfuse POWR-GARD KLDR series, intended for appropriately designed control transformer, solenoid and industrial control applications.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eThe 1\/4 A version is identified as KLDR.250 in the Littelfuse manufacturer datasheet. KLDR-1\/4 is a commonly used fractional-amperage model designation.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\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\u003eThe fuse is rated for 600 VAC and 300 VDC. The appropriate rating must be selected according to the intended AC or DC circuit.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC interrupting ratings?\u003c\/strong\u003e\u003cbr\u003eThe AC interrupting rating is 200,000 amperes RMS symmetrical, while the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC interrupting rating as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLDR-1\/4 a time-delay or fast-acting fuse?\u003c\/strong\u003e\u003cbr\u003eKLDR-1\/4 is a time-delay fuse designed to accommodate temporary inrush currents associated with control transformers, solenoids and similar inductive components.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fuse open in exactly 12 seconds at twice the rated current?\u003c\/strong\u003e\u003cbr\u003eNo. The UL agency requirement specifies a minimum opening time of 12 seconds at 200% of rated current. It is not a fixed opening time. Use the manufacturer time-current curves to assess actual circuit protection behavior.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the pre-arcing and total clearing I²t values?\u003c\/strong\u003e\u003cbr\u003eLittelfuse lists a pre-arcing I²t value of 0.0138 A²s and a total clearing I²t value of 0.0967 A²s in the manufacturer electrical specifications table. The latter is identified under the 200 kA test condition.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions?\u003c\/strong\u003e\u003cbr\u003eThe nominal dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.41 inch by 1.50 inches.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat materials and fuse holders are used?\u003c\/strong\u003e\u003cbr\u003eLittelfuse specifies a melamine body and nickel-plated bronze caps. Compatible fuse holders include appropriately specified products from the L60030C, LPSC\/LFPSC, LEC and 571\/572 series.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLDR-1\/4 UL listed and RoHS compliant?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer identifies the KLDR series as UL Listed under file E81895, CSA Certified under file LR29862 and RoHS compliant. The datasheet also provides a CE declaration reference. The listed DC interrupting rating is self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should be verified before ordering?\u003c\/strong\u003e\u003cbr\u003eConfirm the KLDR-1\/4 or KLDR.250 designation, 0.25 A current rating, 600 VAC or 300 VDC voltage requirement, applicable interrupting capacity, time-delay characteristics, fuse-holder compatibility and purchase quantity. Littelfuse lists KLDR.250TXP for a 10-piece manufacturer pack and KLDR.250HXP for a 100-piece manufacturer pack; these ordering codes do not establish the quantity provided by an individual retail 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":67898349846607,"sku":"LL1-LI-KLDR-1\/4*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67898349879375,"sku":"LL1-LI-KLDR-1\/4*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67898349912143,"sku":"LL1-LI-KLDR-1\/4*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67898349944911,"sku":"LL1-LI-KLDR-1\/4*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLDR-1_4-01.jpg?v=1793169084","url":"https:\/\/yunshuotrade.com\/products\/littelfuse-kldr-1-4-fuse","provider":"yunshuotrade","version":"1.0","type":"link"}