{"product_id":"littelfuse-klsr400-400a-class-rk1-fast-acting-fuse-knife-blade-600vac-300vdc","title":"Littelfuse KLSR400 400A Class RK1 Fast-Acting Fuse – Knife-Blade – 600VAC\/300VDC","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"324cc105-4be2-4814-8abb-a5a1f77a5327\" 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=\"324cc105-4be2-4814-8abb-a5a1f77a5327\" data-turn-id-container=\"324cc105-4be2-4814-8abb-a5a1f77a5327\" data-testid=\"conversation-turn-30\" 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=\"324cc105-4be2-4814-8abb-a5a1f77a5327\" data-turn-start-message=\"true\" 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\" 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=\"86\" data-end=\"606\"\u003eThe Littelfuse KLSR400 is a Class RK1 fast-acting current-limiting fuse designed for high-performance short-circuit protection in industrial and commercial electrical systems. Built with a single-element silver link construction, it delivers rapid response to fault conditions. It is commonly used to protect surge-sensitive equipment such as variable speed drives, rectifiers, and electronic systems, but may require oversizing in motor or inductive load applications to avoid nuisance operation due to inrush currents.\u003c\/p\u003e\n\u003ch3 data-section-id=\"yc43s8\" data-start=\"608\" data-end=\"630\"\u003eVoltage and Rating\u003c\/h3\u003e\n\u003cul data-start=\"631\" data-end=\"780\"\u003e\n\u003cli data-section-id=\"1klu6p3\" data-start=\"631\" data-end=\"657\"\u003eCurrent Rating: 400 Amps\u003c\/li\u003e\n\u003cli data-section-id=\"10uce35\" data-start=\"658\" data-end=\"688\"\u003eVoltage Rating: 600 Volts AC\u003c\/li\u003e\n\u003cli data-section-id=\"9fd05y\" data-start=\"689\" data-end=\"722\"\u003eDC Voltage Rating: 300 Volts DC\u003c\/li\u003e\n\u003cli data-section-id=\"1cuenj9\" data-start=\"723\" data-end=\"780\"\u003eInterrupting Rating: 200 kA AIR (up to 20 kA @ 300 VDC)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"uvdx3z\" data-start=\"782\" data-end=\"804\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul data-start=\"805\" data-end=\"1013\"\u003e\n\u003cli data-section-id=\"wijt83\" data-start=\"805\" data-end=\"833\"\u003eFuse Type: Fast-Acting (F)\u003c\/li\u003e\n\u003cli data-section-id=\"1unc7hb\" data-start=\"834\" data-end=\"857\"\u003eFuse Class: Class RK1\u003c\/li\u003e\n\u003cli data-section-id=\"k4fsuj\" data-start=\"858\" data-end=\"886\"\u003eMounting Type: Knife-Blade\u003c\/li\u003e\n\u003cli data-section-id=\"b0m8sv\" data-start=\"887\" data-end=\"901\"\u003eSeries: KLSR\u003c\/li\u003e\n\u003cli data-section-id=\"1kphyi2\" data-start=\"902\" data-end=\"939\"\u003eFamily Style: Current Limiting Fuse\u003c\/li\u003e\n\u003cli data-section-id=\"17qmmtf\" data-start=\"940\" data-end=\"1013\"\u003eApplication: Short-circuit protection for industrial electrical systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nucr17\" data-start=\"1015\" data-end=\"1043\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1044\" data-end=\"1361\"\u003e\n\u003cli data-section-id=\"qiwjk0\" data-start=\"1044\" data-end=\"1081\"\u003eOpening Characteristic: Fast-Acting\u003c\/li\u003e\n\u003cli data-section-id=\"hdskf5\" data-start=\"1082\" data-end=\"1105\"\u003eCurrent Limiting: Yes\u003c\/li\u003e\n\u003cli data-section-id=\"1izn0e4\" data-start=\"1106\" data-end=\"1140\"\u003eInterrupt Amperage: 200,000 Amps\u003c\/li\u003e\n\u003cli data-section-id=\"1892vgj\" data-start=\"1141\" data-end=\"1190\"\u003eConstruction: Single-element silver link design\u003c\/li\u003e\n\u003cli data-section-id=\"5kzgux\" data-start=\"1191\" data-end=\"1267\"\u003eSuitable For: Variable speed drives, rectifiers, surge-sensitive equipment\u003c\/li\u003e\n\u003cli data-section-id=\"ao3owz\" data-start=\"1268\" data-end=\"1361\"\u003eSafety Rating: High interrupting capacity reduces need for extensive short-circuit analysis\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1aljov1\" data-start=\"1363\" data-end=\"1379\"\u003eProduct Data\u003c\/h3\u003e\n\u003cul data-start=\"1380\" data-end=\"1466\"\u003e\n\u003cli data-section-id=\"1xtv818\" data-start=\"1380\" data-end=\"1406\"\u003eManufacturer: Littelfuse\u003c\/li\u003e\n\u003cli data-section-id=\"gb0ch8\" data-start=\"1407\" data-end=\"1430\"\u003eModel Number: KLSR400\u003c\/li\u003e\n\u003cli data-section-id=\"15kmg9l\" data-start=\"1431\" data-end=\"1466\"\u003eSeries: KLSR RK1 Fast-Acting Fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"19zqy0x\" data-start=\"1468\" data-end=\"1480\"\u003eFeatures\u003c\/h3\u003e\n\u003cul data-start=\"1481\" data-end=\"1771\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"n66kro\" data-start=\"1481\" data-end=\"1537\"\u003eExtremely current-limiting for fast fault interruption\u003c\/li\u003e\n\u003cli data-section-id=\"69ohdb\" data-start=\"1538\" data-end=\"1596\"\u003eReliable protection up to 200 kA available fault current\u003c\/li\u003e\n\u003cli data-section-id=\"1oko51v\" data-start=\"1597\" data-end=\"1654\"\u003eHelps reduce equipment damage from short-circuit energy\u003c\/li\u003e\n\u003cli data-section-id=\"fnvk6w\" data-start=\"1655\" data-end=\"1701\"\u003eKnife-blade design for standard fuse holders\u003c\/li\u003e\n\u003cli data-section-id=\"1emlk2f\" data-start=\"1702\" data-end=\"1771\" data-is-last-node=\"\"\u003eIdeal for industrial distribution and electronic protection systems\u003c\/li\u003e\n\u003c\/ul\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\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":48478318559481,"sku":"KLSR400","price":401.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/4000.jpg?v=1780434740","url":"https:\/\/mycircuitbreakers.com\/products\/littelfuse-klsr400-400a-class-rk1-fast-acting-fuse-knife-blade-600vac-300vdc","provider":"My Circuit Breakers","version":"1.0","type":"link"}