{"product_id":"littelfuse-kllu1200-class-l-fuse-1200a-600v-time-delay-fuse","title":"Littelfuse KLLU1200 Class L Fuse – 1200A – 600V Time-Delay Fuse","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a11c9d2-fa5c-83e8-934f-b46429aa1619-30\" 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-b46429aa1619-30\" data-turn-id-container=\"request-6a11c9d2-fa5c-83e8-934f-b46429aa1619-30\" data-testid=\"conversation-turn-416\" 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=\"7209a924-0f73-46be-88b5-a6737a089985\" dir=\"auto\" data-message-model-slug=\"gpt-5-3-mini\" 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=\"90\" data-end=\"458\"\u003eThe Littelfuse KLLU1200 is a 1200 Amp Class L time-delay fuse designed as a cost-effective alternative to the POWR-PRO™ KLPC series while still meeting or exceeding UL Class L requirements. It is engineered for high-capacity industrial power distribution systems where reliable short-circuit protection, selective coordination, and motor inrush tolerance are required.\u003c\/p\u003e\n\u003cp data-start=\"460\" data-end=\"637\"\u003eThis fuse provides robust protection for feeders, large motors, and transformers, while maintaining a lower cost profile compared to premium specification-grade Class L options.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1judnlb\" data-start=\"644\" data-end=\"665\"\u003eElectrical Rating\u003c\/h3\u003e\n\u003cul data-start=\"666\" data-end=\"809\"\u003e\n\u003cli data-section-id=\"dde1qo\" data-start=\"666\" data-end=\"695\"\u003eCurrent Rating: 1200 Amps\u003c\/li\u003e\n\u003cli data-section-id=\"1s2lsbc\" data-start=\"696\" data-end=\"727\"\u003eMaximum AC Voltage: 600 VAC\u003c\/li\u003e\n\u003cli data-section-id=\"3p3ayl\" data-start=\"728\" data-end=\"759\"\u003eMaximum DC Voltage: 300 VDC\u003c\/li\u003e\n\u003cli data-section-id=\"fnoj3s\" data-start=\"760\" data-end=\"809\"\u003eInterrupting Rating:\n\u003cul data-start=\"785\" data-end=\"809\"\u003e\n\u003cli data-section-id=\"q1zcdh\" data-start=\"785\" data-end=\"809\"\u003e200 kA AC at 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=\"816\" data-end=\"838\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul data-start=\"839\" data-end=\"1057\"\u003e\n\u003cli data-section-id=\"15ezalo\" data-start=\"839\" data-end=\"867\"\u003eManufacturer: Littelfuse\u003c\/li\u003e\n\u003cli data-section-id=\"mavatb\" data-start=\"868\" data-end=\"896\"\u003eCatalog Number: KLLU1200\u003c\/li\u003e\n\u003cli data-section-id=\"1shf2rb\" data-start=\"897\" data-end=\"913\"\u003eSeries: KLLU\u003c\/li\u003e\n\u003cli data-section-id=\"1uncqjf\" data-start=\"914\" data-end=\"937\"\u003eFuse Class: Class L\u003c\/li\u003e\n\u003cli data-section-id=\"113ctc8\" data-start=\"938\" data-end=\"968\"\u003eConstruction Type: Bolt-In\u003c\/li\u003e\n\u003cli data-section-id=\"1383xbz\" data-start=\"969\" data-end=\"1004\"\u003eFuse Type: Time-Delay (Slo-Blo)\u003c\/li\u003e\n\u003cli data-section-id=\"fnxc28\" data-start=\"1005\" data-end=\"1038\"\u003eFamily: Current-Limiting Fuse\u003c\/li\u003e\n\u003cli data-section-id=\"q4hlgv\" data-start=\"1039\" data-end=\"1057\"\u003eIndicating: No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"krhh0r\" data-start=\"1064\" data-end=\"1094\"\u003eProtection Characteristics\u003c\/h3\u003e\n\u003cul data-start=\"1095\" data-end=\"1554\"\u003e\n\u003cli data-section-id=\"2vr9pj\" data-start=\"1095\" data-end=\"1175\"\u003eTime-delay design provides at least 10-second delay at 500% of rated current\u003c\/li\u003e\n\u003cli data-section-id=\"1khedgy\" data-start=\"1176\" data-end=\"1242\"\u003eAccommodates motor starting and inductive load inrush currents\u003c\/li\u003e\n\u003cli data-section-id=\"d5dnbq\" data-start=\"1243\" data-end=\"1309\"\u003eCurrent-limiting action reduces damage during fault conditions\u003c\/li\u003e\n\u003cli data-section-id=\"1gm11ks\" data-start=\"1310\" data-end=\"1390\"\u003eHigh interrupting rating (200 kA) ensures strong fault protection capability\u003c\/li\u003e\n\u003cli data-section-id=\"1gi2tqg\" data-start=\"1391\" data-end=\"1483\"\u003eSupports selective coordination with other Class L and Littelfuse current-limiting fuses\u003c\/li\u003e\n\u003cli data-section-id=\"191a4uz\" data-start=\"1484\" data-end=\"1554\"\u003eHelps reduce downtime by isolating only the faulted branch circuit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"xldzoc\" data-start=\"1561\" data-end=\"1586\"\u003eConstruction Features\u003c\/h3\u003e\n\u003cul data-start=\"1587\" data-end=\"1845\"\u003e\n\u003cli data-section-id=\"pyotnx\" data-start=\"1587\" data-end=\"1624\"\u003eBolt-in Class L fuse construction\u003c\/li\u003e\n\u003cli data-section-id=\"82kaqz\" data-start=\"1625\" data-end=\"1700\"\u003eIndustrial-grade, heavy-duty design for high fault current environments\u003c\/li\u003e\n\u003cli data-section-id=\"9lmvzs\" data-start=\"1701\" data-end=\"1746\"\u003eCost-effective alternative to KLPC series\u003c\/li\u003e\n\u003cli data-section-id=\"x7ykas\" data-start=\"1747\" data-end=\"1812\"\u003eDesigned for long service life and reliable system protection\u003c\/li\u003e\n\u003cli data-section-id=\"n1bgx2\" data-start=\"1813\" data-end=\"1845\"\u003eNon-indicating configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1dp59sz\" data-start=\"1852\" data-end=\"1880\"\u003eMounting \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cul data-start=\"1881\" data-end=\"2041\"\u003e\n\u003cli data-section-id=\"hminvj\" data-start=\"1881\" data-end=\"1909\"\u003eMounting Method: Bolt-In\u003c\/li\u003e\n\u003cli data-section-id=\"1fpvg7l\" data-start=\"1910\" data-end=\"1961\"\u003eCompatible with Class L fuse blocks and holders\u003c\/li\u003e\n\u003cli data-section-id=\"wl0nkd\" data-start=\"1962\" data-end=\"2041\"\u003eUsed in switchboards, switchgear, and large industrial distribution systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"wggvqn\" data-start=\"2048\" data-end=\"2064\"\u003eApplications\u003c\/h3\u003e\n\u003cul data-start=\"2065\" data-end=\"2280\"\u003e\n\u003cli data-section-id=\"rpjpp\" data-start=\"2065\" data-end=\"2103\"\u003eMain and feeder circuit protection\u003c\/li\u003e\n\u003cli data-section-id=\"hcon8e\" data-start=\"2104\" data-end=\"2128\"\u003eLarge motor circuits\u003c\/li\u003e\n\u003cli data-section-id=\"1uzj8ti\" data-start=\"2129\" data-end=\"2171\"\u003eTransformers and heavy inductive loads\u003c\/li\u003e\n\u003cli data-section-id=\"n7lx3w\" data-start=\"2172\" data-end=\"2213\"\u003eIndustrial power distribution systems\u003c\/li\u003e\n\u003cli data-section-id=\"k6aw0r\" data-start=\"2214\" data-end=\"2245\"\u003eSwitchgear and switchboards\u003c\/li\u003e\n\u003cli data-section-id=\"1awzusj\" data-start=\"2246\" data-end=\"2280\"\u003eSelective coordination systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1aljov1\" data-start=\"2287\" data-end=\"2303\"\u003eProduct Data\u003c\/h3\u003e\n\u003cul data-start=\"2304\" data-end=\"2436\"\u003e\n\u003cli data-section-id=\"15ezalo\" data-start=\"2304\" data-end=\"2332\"\u003eManufacturer: Littelfuse\u003c\/li\u003e\n\u003cli data-section-id=\"mavatb\" data-start=\"2333\" data-end=\"2361\"\u003eCatalog Number: KLLU1200\u003c\/li\u003e\n\u003cli data-section-id=\"1shf2rb\" data-start=\"2362\" data-end=\"2378\"\u003eSeries: KLLU\u003c\/li\u003e\n\u003cli data-section-id=\"1uncqjf\" data-start=\"2379\" data-end=\"2402\"\u003eFuse Class: Class L\u003c\/li\u003e\n\u003cli data-section-id=\"fnxc28\" data-start=\"2403\" data-end=\"2436\"\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":48478064050425,"sku":"KLLU1200","price":501.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/1280_Y38q0TJgMgo11oya.jpg?v=1780424671","url":"https:\/\/mycircuitbreakers.com\/products\/littelfuse-kllu1200-class-l-fuse-1200a-600v-time-delay-fuse","provider":"My Circuit Breakers","version":"1.0","type":"link"}