{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.315NRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.315NRL","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.315NRL","factsUrl":"https://icboms.com/api/mcp/products/0451.315NRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 Series, Board Mount Surface Mount Fuse, Fast Blow, 315 mA, 125 V AC/DC, 50 A Breaking Capacity, 2-SMD Square End Block Package, Tape & Reel.","salesMarkdown":"## 315 mA fast-blow fuse for secondary-side protection The Littelfuse 0451.315NRL is a 315 mA fast-acting surface-mount fuse from the NANO²® 451 series, designed to clear quickly on high overcurrents — protecting downstream ICs, power modules, and control circuits from fault energy. Rated for 125 V AC and DC with a 50 A interrupting capacity, it safely opens the circuit under short-circuit conditions up to that fault level without casing rupture or arc propagation. ## Breaking capacity and coordination data The 50 A breaking capacity at 125 V AC/DC means this fuse can interrupt a fault current up to that level — sufficient for most secondary-side power supplies, DC-DC converters, and control circuits where the prospective short-circuit current stays below 50 A. Melting I²t of 0.0311 A²s is the energy required to melt the fusible element; this value is used to coordinate with upstream circuit breakers or fuses so that the 0451.315NRL opens before the upstream device on a downstream fault. ## Temperature range and approvals CSA and UL approvals mean the fuse is accepted for use in equipment certified to North American safety standards — a requirement for OEMs shipping into the US and Canadian markets.","metaTitle":"0451.315NRL Littelfuse NANO² 451 Fuse, 315 mA, Fast Blow","metaDescription":"Littelfuse 0451.315NRL NANO² 451 surface-mount fuse, 315 mA, 125 V, fast blow, 50 A breaking capacity. Active production. UL/CSA approved. Order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Color":"-","Series":"NANO²® 451","Package":"Tape & Reel (TR)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"0.0311","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Active","Approval Agency":"CSA, UL","lifecycle_stage":"unknown","Size / Dimension":"0.240\\\" L x 0.106\\\" W x 0.106\\\" H (6.10mm x 2.69mm x 2.69mm)","DC Cold Resistance":"0.3918 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"315 mA","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5926","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the breaking capacity of the 0451.315NRL?","answer":"The 0451.315NRL has a breaking capacity of 50 A at its rated voltage of 125 V AC or DC. This means it can safely interrupt a fault current up to 50 A without rupturing."},{"question":"What approvals does the 0451.315NRL carry?","answer":"The fuse is CSA and UL approved, confirming compliance with North American safety standards for overcurrent protection components."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.315NRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.315NRL when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}