{"product_id":"littelfuse-kllu800-class-l-fuse-800a-600v-time-delay-fuse","title":"Littelfuse KLLU800 Class L Fuse – 800A – 600V Time-Delay Fuse","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a11c9d2-fa5c-83e8-934f-b46429aa1619-36\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-6a11c9d2-fa5c-83e8-934f-b46429aa1619-36\" data-turn-id-container=\"request-6a11c9d2-fa5c-83e8-934f-b46429aa1619-36\" data-testid=\"conversation-turn-428\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"279333e3-5c90-4faa-b644-10cc552c4b45\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full dark markdown-new-styling\"\u003e\n\u003cp data-start=\"88\" data-end=\"603\"\u003eThe Littelfuse KLLU800 is an 800 Amp Class L time-delay fuse designed for high-capacity industrial and commercial electrical distribution systems. Part of the KLLU series, this UL Listed fuse provides dependable overload and short-circuit protection while offering a cost-effective alternative to the POWR-PRO™ KLPC series. Its time-delay characteristics allow temporary motor starting currents and transformer inrush currents to pass without nuisance opening, ensuring reliable operation in demanding applications.\u003c\/p\u003e\n\u003cp data-start=\"605\" data-end=\"781\"\u003eKLLU series fuses meet or exceed all UL requirements for Class L fuses and provide excellent protection for feeders, motors, switchgear, and large power distribution equipment.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1judnlb\" data-start=\"788\" data-end=\"809\"\u003eElectrical Rating\u003c\/h3\u003e\n\u003cul data-start=\"810\" data-end=\"951\"\u003e\n\u003cli data-section-id=\"1khni0b\" data-start=\"810\" data-end=\"838\"\u003eCurrent Rating: 800 Amps\u003c\/li\u003e\n\u003cli data-section-id=\"1s2lsbc\" data-start=\"839\" data-end=\"870\"\u003eMaximum AC Voltage: 600 VAC\u003c\/li\u003e\n\u003cli data-section-id=\"3p3ayl\" data-start=\"871\" data-end=\"902\"\u003eMaximum DC Voltage: 300 VDC\u003c\/li\u003e\n\u003cli data-section-id=\"gjiobx\" data-start=\"903\" data-end=\"951\"\u003eInterrupting Rating:\n\u003cul data-start=\"928\" data-end=\"951\"\u003e\n\u003cli data-section-id=\"1263bk\" data-start=\"928\" data-end=\"951\"\u003e200 kA AC @ 600 VAC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"uvdx3z\" data-start=\"958\" data-end=\"980\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul data-start=\"981\" data-end=\"1198\"\u003e\n\u003cli data-section-id=\"15ezalo\" data-start=\"981\" data-end=\"1009\"\u003eManufacturer: Littelfuse\u003c\/li\u003e\n\u003cli data-section-id=\"6x0xic\" data-start=\"1010\" data-end=\"1037\"\u003eCatalog Number: KLLU800\u003c\/li\u003e\n\u003cli data-section-id=\"1shf2rb\" data-start=\"1038\" data-end=\"1054\"\u003eSeries: KLLU\u003c\/li\u003e\n\u003cli data-section-id=\"1uncqjf\" data-start=\"1055\" data-end=\"1078\"\u003eFuse Class: Class L\u003c\/li\u003e\n\u003cli data-section-id=\"113ctc8\" data-start=\"1079\" data-end=\"1109\"\u003eConstruction Type: Bolt-In\u003c\/li\u003e\n\u003cli data-section-id=\"1383xbz\" data-start=\"1110\" data-end=\"1145\"\u003eFuse Type: Time-Delay (Slo-Blo)\u003c\/li\u003e\n\u003cli data-section-id=\"fnxc28\" data-start=\"1146\" data-end=\"1179\"\u003eFamily: Current-Limiting Fuse\u003c\/li\u003e\n\u003cli data-section-id=\"q4hlgv\" data-start=\"1180\" data-end=\"1198\"\u003eIndicating: No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"krhh0r\" data-start=\"1205\" data-end=\"1235\"\u003eProtection Characteristics\u003c\/h3\u003e\n\u003cul data-start=\"1236\" data-end=\"1742\"\u003e\n\u003cli data-section-id=\"1dkifmp\" data-start=\"1236\" data-end=\"1293\"\u003eMinimum 10-second time delay at 500% of rated current\u003c\/li\u003e\n\u003cli data-section-id=\"7kks75\" data-start=\"1294\" data-end=\"1363\"\u003eAccommodates motor starting currents and transformer inrush loads\u003c\/li\u003e\n\u003cli data-section-id=\"1hhm2tv\" data-start=\"1364\" data-end=\"1445\"\u003eCurrent-limiting design reduces short-circuit damage to systems and equipment\u003c\/li\u003e\n\u003cli data-section-id=\"ztfbe9\" data-start=\"1446\" data-end=\"1518\"\u003eHigh 200 kA interrupting capacity provides superior fault protection\u003c\/li\u003e\n\u003cli data-section-id=\"1byi0vc\" data-start=\"1519\" data-end=\"1594\"\u003eProtects branch circuit conductors, motor control equipment, and motors\u003c\/li\u003e\n\u003cli data-section-id=\"7wfktw\" data-start=\"1595\" data-end=\"1678\"\u003eSelective coordination with other Class L and Littelfuse current-limiting fuses\u003c\/li\u003e\n\u003cli data-section-id=\"1eucru7\" data-start=\"1679\" data-end=\"1742\"\u003eHelps reduce downtime by isolating only the faulted circuit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"xldzoc\" data-start=\"1749\" data-end=\"1774\"\u003eConstruction Features\u003c\/h3\u003e\n\u003cul data-start=\"1775\" data-end=\"2043\"\u003e\n\u003cli data-section-id=\"u16vvj\" data-start=\"1775\" data-end=\"1823\"\u003eHeavy-duty bolt-in Class L fuse construction\u003c\/li\u003e\n\u003cli data-section-id=\"wcjcwv\" data-start=\"1824\" data-end=\"1882\"\u003eUL Listed and compliant with Class L fuse requirements\u003c\/li\u003e\n\u003cli data-section-id=\"16dug4x\" data-start=\"1883\" data-end=\"1948\"\u003eIndustrial-grade design for demanding electrical environments\u003c\/li\u003e\n\u003cli data-section-id=\"turfpy\" data-start=\"1949\" data-end=\"2010\"\u003eCost-effective alternative to POWR-PRO™ KLPC series fuses\u003c\/li\u003e\n\u003cli data-section-id=\"n1bgx2\" data-start=\"2011\" data-end=\"2043\"\u003eNon-indicating configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"565xk3\" data-start=\"2050\" data-end=\"2073\"\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul data-start=\"2074\" data-end=\"2510\"\u003e\n\u003cli data-section-id=\"fmwtsp\" data-start=\"2074\" data-end=\"2156\"\u003eCurrent-limiting protection minimizes equipment damage during fault conditions\u003c\/li\u003e\n\u003cli data-section-id=\"tur1rw\" data-start=\"2157\" data-end=\"2216\"\u003eEasily coordinated with other system protective devices\u003c\/li\u003e\n\u003cli data-section-id=\"18s431e\" data-start=\"2217\" data-end=\"2298\"\u003e200 kA AC interrupting rating supports present and future system requirements\u003c\/li\u003e\n\u003cli data-section-id=\"18xd2ir\" data-start=\"2299\" data-end=\"2373\"\u003eTime-current characteristics closely match many circuit breaker curves\u003c\/li\u003e\n\u003cli data-section-id=\"i7nbox\" data-start=\"2374\" data-end=\"2459\"\u003eAllows greater flexibility in breaker coordination than fast-acting Class L fuses\u003c\/li\u003e\n\u003cli data-section-id=\"sxwnoj\" data-start=\"2460\" data-end=\"2510\"\u003eEnhances equipment life and system reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2512\" data-end=\"2515\"\u003e\n\u003ch3 data-section-id=\"1dp59sz\" data-start=\"2517\" data-end=\"2545\"\u003eMounting \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cul data-start=\"2546\" data-end=\"2736\"\u003e\n\u003cli data-section-id=\"hminvj\" data-start=\"2546\" data-end=\"2574\"\u003eMounting Method: Bolt-In\u003c\/li\u003e\n\u003cli data-section-id=\"kq1c21\" data-start=\"2575\" data-end=\"2649\"\u003eCompatible with Class L fuse clips, fuse blocks, and mounting hardware\u003c\/li\u003e\n\u003cli data-section-id=\"11fkr4o\" data-start=\"2650\" data-end=\"2736\"\u003eSuitable for switchboards, switchgear, feeder circuits, and distribution equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"wggvqn\" data-start=\"2743\" data-end=\"2759\"\u003eApplications\u003c\/h3\u003e\n\u003cul data-start=\"2760\" data-end=\"3016\"\u003e\n\u003cli data-section-id=\"8xlv6l\" data-start=\"2760\" data-end=\"2787\"\u003eMain service protection\u003c\/li\u003e\n\u003cli data-section-id=\"ur0r8t\" data-start=\"2788\" data-end=\"2817\"\u003eFeeder circuit protection\u003c\/li\u003e\n\u003cli data-section-id=\"hcon8e\" data-start=\"2818\" data-end=\"2842\"\u003eLarge motor circuits\u003c\/li\u003e\n\u003cli data-section-id=\"fknz5c\" data-start=\"2843\" data-end=\"2869\"\u003eTransformer protection\u003c\/li\u003e\n\u003cli data-section-id=\"1j39mqk\" data-start=\"2870\" data-end=\"2912\"\u003eIndustrial switchgear and switchboards\u003c\/li\u003e\n\u003cli data-section-id=\"143eonf\" data-start=\"2913\" data-end=\"2969\"\u003eCommercial and industrial power distribution systems\u003c\/li\u003e\n\u003cli data-section-id=\"lqiu41\" data-start=\"2970\" data-end=\"3016\"\u003eSelectively coordinated electrical systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1aljov1\" data-start=\"3023\" data-end=\"3039\"\u003eProduct Data\u003c\/h3\u003e\n\u003cul data-start=\"3040\" data-end=\"3222\"\u003e\n\u003cli data-section-id=\"15ezalo\" data-start=\"3040\" data-end=\"3068\"\u003eManufacturer: Littelfuse\u003c\/li\u003e\n\u003cli data-section-id=\"6x0xic\" data-start=\"3069\" data-end=\"3096\"\u003eCatalog Number: KLLU800\u003c\/li\u003e\n\u003cli data-section-id=\"j7i9rs\" data-start=\"3097\" data-end=\"3147\"\u003eProduct Type: Time-Delay Current-Limiting Fuse\u003c\/li\u003e\n\u003cli data-section-id=\"1shf2rb\" data-start=\"3148\" data-end=\"3164\"\u003eSeries: KLLU\u003c\/li\u003e\n\u003cli data-section-id=\"1uncqjf\" data-start=\"3165\" data-end=\"3188\"\u003eFuse Class: Class L\u003c\/li\u003e\n\u003cli data-section-id=\"fnxc28\" data-start=\"3189\" data-end=\"3222\"\u003eFamily: Current-Limiting Fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"NEW","offer_id":48478145085689,"sku":"KLLU800","price":501.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/1280_o0gWK0bZcZ72ccGT.jpg?v=1780427766","url":"https:\/\/mycircuitbreakers.com\/products\/littelfuse-kllu800-class-l-fuse-800a-600v-time-delay-fuse","provider":"My Circuit Breakers","version":"1.0","type":"link"}