{"product_id":"littelfuse-kldr-1-1-4-fuse","title":"Littelfuse KLDR-1-1\/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-line:#c9dce9;--surface:#ffffff;--surface-soft:#f7fbfe;--text-main:#173042;--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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.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\u003eKLDR-1-1\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Catalog Number\u003c\/td\u003e\n\u003ctd\u003eKLDR1.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Marking\u003c\/td\u003e\n\u003ctd\u003eKLDR 1 1\/4 A\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\u003e1.25 A (1250 mA, 1-1\/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\u003eTime-Delay\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\u003e1.25 A Current Rating\u003c\/h3\u003e\n\u003cp\u003eThe Littelfuse KLDR-1-1\/4 provides a 1.25 ampere current rating for appropriately specified industrial control circuits, transformer primary circuits and inductive electrical equipment. Its 1250 mA rating supports applications requiring Class CC time-delay overcurrent protection.\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. Separate AC and DC interrupting ratings support application-specific selection according to operating voltage and available prospective fault current.\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 inrush currents associated with 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 separate 20 kA DC interrupting rating. Littelfuse identifies the DC rating as self-certified. Both ratings should be evaluated against the prospective short-circuit current of the installation.\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 thermal and magnetic effects during short-circuit events. Its rejection feature helps prevent installation of unsuitable lower-voltage or lower-interrupting-rated fuses when used with corresponding rejection-type 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 caps and a nominal 10.3 x 38.1 mm cartridge format. Compatible mounting accessories include appropriately rated Littelfuse L60030C, LPSC\/LFPSC, LEC and 571\/572 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-1-1\/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-1-1\/4?\u003c\/strong\u003e\u003cbr\u003eIt is a 1.25 A Class CC time-delay, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLDR series. The fuse is designed for compatible control transformers, solenoids and other industrial control applications.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer catalog number?\u003c\/strong\u003e\u003cbr\u003eLittelfuse identifies the 1-1\/4 A version under manufacturer catalog number KLDR1.25. The product marking is KLDR 1 1\/4 A.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the current rating?\u003c\/strong\u003e\u003cbr\u003eThe rated current is 1.25 amperes, equivalent to 1250 milliamperes or one and one-quarter amperes.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the AC and DC voltage ratings?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer specifies 600 VAC and 300 VDC. Confirm that the intended circuit is within the appropriate voltage rating and installation requirements.\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 at 600 VAC. The DC interrupting rating is 20,000 amperes at 300 VDC and is identified by Littelfuse as self-certified.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLDR-1-1\/4 a time-delay or fast-acting fuse?\u003c\/strong\u003e\u003cbr\u003eKLDR-1-1\/4 is a time-delay fuse. The KLDR series is designed to accommodate temporary magnetizing inrush currents associated with control transformers, solenoids and similar inductive components.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDoes KLDR-1-1\/4 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. This is not a fixed opening time. Consult the manufacturer's time-current curves to evaluate 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 specifies a pre-arcing I²t value of 0.4367 A²s and a total clearing I²t value of 7.354 A²s. The total clearing value is listed under the manufacturer's 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 cartridge 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 with nickel-plated bronze caps. Recommended compatible holder families include L60030C, LPSC\/LFPSC, LEC and 571\/572. The specific fuse holder must meet the application's electrical and mechanical requirements.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eIs KLDR-1-1\/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 references a CE declaration. Its DC interrupting rating is manufacturer 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-1-1\/4 or KLDR1.25 designation, 1.25 A current rating, applicable 600 VAC or 300 VDC requirement, AC or DC interrupting capacity, time-delay characteristics, fuse-holder compatibility and purchase quantity. Littelfuse lists KLDR1.25TXP for a 10-piece manufacturer pack and KLDR1.25HXP for a 100-piece manufacturer pack; these ordering codes do not determine the quantity supplied in 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":67898595409999,"sku":"LL1-LI-KLDR-1-1\/4*10","price":48.86,"currency_code":"USD","in_stock":true},{"title":"5PCS","offer_id":67898595377231,"sku":"LL1-LI-KLDR-1-1\/4*5","price":27.92,"currency_code":"USD","in_stock":true},{"title":"1PCS","offer_id":67898595344463,"sku":"LL1-LI-KLDR-1-1\/4*1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"20PCS","offer_id":67898595442767,"sku":"LL1-LI-KLDR-1-1\/4*20","price":83.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/7569\/2623\/files\/KLDR-1-1_4-01.jpg?v=1793171463","url":"https:\/\/yunshuotrade.com\/products\/littelfuse-kldr-1-1-4-fuse","provider":"yunshuotrade","version":"1.0","type":"link"}