{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"04513.15NRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"04513.15NRL","canonicalUrl":"https://icboms.com/littelfuse-inc/04513.15NRL","factsUrl":"https://icboms.com/api/mcp/products/04513.15NRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 Series, Board Mount SMD Fast Blow Fuse, 04513.15NRL, 3.15 A, 125 V AC/DC, 50 A Breaking Capacity, 2-SMD Square End Block Package.","salesMarkdown":"## 3.15 A fast-blow in a 2-SMD footprint The 04513.15NRL is a Littelfuse NANO²® 451 series surface-mount fast-blow fuse rated for 3.15 A continuous current at 125 V AC or DC. Its 50 A breaking capacity at rated voltage means it can safely interrupt a short-circuit fault up to that level without rupturing — a critical parameter for secondary-side protection in power supplies and DC-DC converter outputs where the available fault current from the bulk capacitor bank can exceed the fuse's interrupt rating if undersized. ## Board-level protection for DC rails Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, this fuse occupies minimal PCB real estate and is compatible with standard pick-and-place equipment. The 0.0215 Ohm cold DC resistance keeps voltage drop low — at 3.15 A the I²R loss is roughly 0.21 W, which is manageable for most layouts but should be considered in thermally constrained designs. The melting I²t of 1.92 A²s is the energy required to open the element. For inrush-sensitive loads like capacitive input filters or motors, compare this to the I²t of the transient — if the inrush pulse exceeds the fuse's I²t, the fuse may nuisance-open. The fast-blow response time means it clears quickly on overcurrent, but offers less tolerance to short-duration surges than a time-delay type. ## Active production with global approvals Listed as active in production, the 04513.15NRL carries CSA, PSE, and UL approvals — covering North American and Japanese regulatory acceptance for equipment-level safety.","metaTitle":"04513.15NRL Littelfuse NANO² 451 SMD Fuse, 3.15A, 125V","metaDescription":"04513.15NRL Littelfuse NANO² 451 surface mount fast-blow fuse, 3.15A, 125V AC/DC, 50A breaking capacity. Active, available to order.","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":"1.92","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Active","Approval Agency":"CSA, PSE, 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":"0.0215 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"3.15 A","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":"How can I order 04513.15NRL or check current availability?","answer":"The 04513.15NRL is an active Littelfuse part. Submit an RFQ through the storefront; we source through authorized and independent distribution channels and provide lot traceability on all shipments."},{"question":"What approvals does 04513.15NRL carry?","answer":"The fuse is approved by CSA, PSE, and UL. These certifications cover safety compliance for North American and Japanese markets — UL 248-14 for supplementary protectors, CSA C22.2 No. 248.14, and PSE for Japan's Electrical Appliance and Material Safety Law."},{"question":"What is the closest pin-compatible alternative to 04513.15NRL in the NANO² 451 series?","answer":"Within the same NANO² 451 series, the only difference between order codes is the current rating and associated I²t and resistance values. The 04513.15NRL at 3.15 A has no direct pin-compatible substitute at a different current rating — the package and footprint are identical across the series, but the protection threshold changes. For a different current, select the corresponding 0451xxxNRL variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/04513.15NRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/04513.15NRL 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}}