{"product_id":"littelfuse-flsr300-class-rk5-fuse-300a-600v-time-delay-fuse","title":"Littelfuse FLSR300 Class RK5 Fuse – 300A – 600V Time-Delay Fuse","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a11c9d2-fa5c-83e8-934f-b46429aa1619-7\" 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-b46429aa1619-7\" data-turn-id-container=\"request-6a11c9d2-fa5c-83e8-934f-b46429aa1619-7\" data-testid=\"conversation-turn-332\" 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=\"63fe06e1-78bf-44b6-9bfc-1bc5e7b7b010\" 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=\"90\" data-end=\"550\"\u003eThe Littelfuse FLSR300 is a 300 Amp Class RK5 dual-element time-delay fuse designed for industrial and commercial electrical distribution systems. Part of the FLSR series, this knife-blade fuse provides reliable overload and short-circuit protection for motors, transformers, feeders, and other power distribution equipment. Its dual-element construction permits temporary inrush currents without nuisance opening while maintaining dependable fault protection.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1judnlb\" data-start=\"557\" data-end=\"578\"\u003eElectrical Rating\u003c\/h3\u003e\n\u003cul data-start=\"579\" data-end=\"737\"\u003e\n\u003cli data-section-id=\"1432k74\" data-start=\"579\" data-end=\"607\"\u003eCurrent Rating: 300 Amps\u003c\/li\u003e\n\u003cli data-section-id=\"1s2lsbc\" data-start=\"608\" data-end=\"639\"\u003eMaximum AC Voltage: 600 VAC\u003c\/li\u003e\n\u003cli data-section-id=\"3p3ayl\" data-start=\"640\" data-end=\"671\"\u003eMaximum DC Voltage: 300 VDC\u003c\/li\u003e\n\u003cli data-section-id=\"3fy0ud\" data-start=\"672\" data-end=\"737\"\u003eInterrupting Rating:\n\u003cul data-start=\"699\" data-end=\"737\"\u003e\n\u003cli data-section-id=\"5nvs4y\" data-start=\"699\" data-end=\"712\"\u003e200 kA AC\u003c\/li\u003e\n\u003cli data-section-id=\"1fmwdnp\" data-start=\"715\" data-end=\"737\"\u003e20 kA DC @ 300 VDC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"uvdx3z\" data-start=\"744\" data-end=\"766\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul data-start=\"767\" data-end=\"953\"\u003e\n\u003cli data-section-id=\"15ezalo\" data-start=\"767\" data-end=\"795\"\u003eManufacturer: Littelfuse\u003c\/li\u003e\n\u003cli data-section-id=\"1g1fs4a\" data-start=\"796\" data-end=\"823\"\u003eCatalog Number: FLSR300\u003c\/li\u003e\n\u003cli data-section-id=\"3zw0ma\" data-start=\"824\" data-end=\"840\"\u003eSeries: FLSR\u003c\/li\u003e\n\u003cli data-section-id=\"rsvtqt\" data-start=\"841\" data-end=\"860\"\u003eFuse Class: RK5\u003c\/li\u003e\n\u003cli data-section-id=\"soa6gr\" data-start=\"861\" data-end=\"895\"\u003eConstruction Type: Knife-Blade\u003c\/li\u003e\n\u003cli data-section-id=\"jo8dmo\" data-start=\"896\" data-end=\"934\"\u003eFuse Type: Dual Element Time-Delay\u003c\/li\u003e\n\u003cli data-section-id=\"q4hlgv\" data-start=\"935\" data-end=\"953\"\u003eIndicating: No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"krhh0r\" data-start=\"960\" data-end=\"990\"\u003eProtection Characteristics\u003c\/h3\u003e\n\u003cul data-start=\"991\" data-end=\"1260\"\u003e\n\u003cli data-section-id=\"10on5wt\" data-start=\"991\" data-end=\"1027\"\u003eTime-delay (slow-blow) operation\u003c\/li\u003e\n\u003cli data-section-id=\"19w665b\" data-start=\"1028\" data-end=\"1062\"\u003eDual-element fuse construction\u003c\/li\u003e\n\u003cli data-section-id=\"1608z5w\" data-start=\"1063\" data-end=\"1113\"\u003eProvides overload and short-circuit protection\u003c\/li\u003e\n\u003cli data-section-id=\"tzl6rz\" data-start=\"1114\" data-end=\"1187\"\u003eAccommodates temporary motor starting and transformer inrush currents\u003c\/li\u003e\n\u003cli data-section-id=\"c2lga\" data-start=\"1188\" data-end=\"1260\"\u003eHigh interrupting capacity for industrial power distribution systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"xldzoc\" data-start=\"1267\" data-end=\"1292\"\u003eConstruction Features\u003c\/h3\u003e\n\u003cul data-start=\"1293\" data-end=\"1470\"\u003e\n\u003cli data-section-id=\"cgsz4i\" data-start=\"1293\" data-end=\"1324\"\u003eKnife-blade terminal design\u003c\/li\u003e\n\u003cli data-section-id=\"1lrgeqr\" data-start=\"1325\" data-end=\"1362\"\u003eNon-indicating fuse configuration\u003c\/li\u003e\n\u003cli data-section-id=\"jvmmae\" data-start=\"1363\" data-end=\"1422\"\u003eIndustrial-duty construction for demanding applications\u003c\/li\u003e\n\u003cli data-section-id=\"1s5hpl\" data-start=\"1423\" data-end=\"1470\"\u003eDesigned for reliable long-term performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1dp59sz\" data-start=\"1477\" data-end=\"1505\"\u003eMounting \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cul data-start=\"1506\" data-end=\"1726\"\u003e\n\u003cli data-section-id=\"1yglfdu\" data-start=\"1506\" data-end=\"1553\"\u003eMounting Method: Fuse Block \/ Clip \/ Holder\u003c\/li\u003e\n\u003cli data-section-id=\"1au6kun\" data-start=\"1554\" data-end=\"1621\"\u003eCompatible with standard Class RK5 fuse holders and fuse blocks\u003c\/li\u003e\n\u003cli data-section-id=\"18r6j0i\" data-start=\"1622\" data-end=\"1726\"\u003eSuitable for switchboards, panelboards, motor control centers, and industrial distribution equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"wggvqn\" data-start=\"1733\" data-end=\"1749\"\u003eApplications\u003c\/h3\u003e\n\u003cul data-start=\"1750\" data-end=\"1939\"\u003e\n\u003cli data-section-id=\"fz1udj\" data-start=\"1750\" data-end=\"1785\"\u003eMotor branch circuit protection\u003c\/li\u003e\n\u003cli data-section-id=\"fknz5c\" data-start=\"1786\" data-end=\"1812\"\u003eTransformer protection\u003c\/li\u003e\n\u003cli data-section-id=\"gsgjc0\" data-start=\"1813\" data-end=\"1851\"\u003eIndustrial machinery and equipment\u003c\/li\u003e\n\u003cli data-section-id=\"1b02wdy\" data-start=\"1852\" data-end=\"1898\"\u003eCommercial electrical distribution systems\u003c\/li\u003e\n\u003cli data-section-id=\"14gqy7m\" data-start=\"1899\" data-end=\"1939\"\u003eFeeder and branch circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1aljov1\" data-start=\"1946\" data-end=\"1962\"\u003eProduct Data\u003c\/h3\u003e\n\u003cul data-start=\"1963\" data-end=\"2090\"\u003e\n\u003cli data-section-id=\"15ezalo\" data-start=\"1963\" data-end=\"1991\"\u003eManufacturer: Littelfuse\u003c\/li\u003e\n\u003cli data-section-id=\"1g1fs4a\" data-start=\"1992\" data-end=\"2019\"\u003eCatalog Number: FLSR300\u003c\/li\u003e\n\u003cli data-section-id=\"6027wp\" data-start=\"2020\" data-end=\"2053\"\u003eProduct Type: Time-Delay Fuse\u003c\/li\u003e\n\u003cli data-section-id=\"3zw0ma\" data-start=\"2054\" data-end=\"2070\"\u003eSeries: FLSR\u003c\/li\u003e\n\u003cli data-section-id=\"rsvtqt\" data-start=\"2071\" data-end=\"2090\"\u003eFuse Class: RK5\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":48471307747577,"sku":"FLSR300","price":134.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/1280_gASNT7sy5hJ14AWL.jpg?v=1780328392","url":"https:\/\/mycircuitbreakers.com\/products\/littelfuse-flsr300-class-rk5-fuse-300a-600v-time-delay-fuse","provider":"My Circuit Breakers","version":"1.0","type":"link"}