{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"04513.15MRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"04513.15MRL","canonicalUrl":"https://icboms.com/littelfuse-inc/04513.15MRL","factsUrl":"https://icboms.com/api/mcp/products/04513.15MRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, board mount SMD fuse, 04513.15MRL, 3.15 A, 125 V AC/DC, fast blow, 2-SMD square end block package.","salesMarkdown":"## What the 3.15 A rating and 50 A breaking capacity mean for your board The 04513.15MRL is a Littelfuse NANO²® 451 series surface-mount fuse rated 3.15 A at 125 V AC or DC. The 50 A interrupting rating at 125 V means it can safely clear a fault up to that current without rupturing the package — critical for secondary-side protection in power supplies where the available fault current from the bulk capacitor bank can exceed the fuse's own rating if undersized. Fast-blow response and a melting I²t of 1.92 mean this fuse opens quickly on high overcurrents but tolerates brief inrush pulses — a fit for circuits where the load's startup surge is short relative to the fault energy. ## Package, footprint, and temperature range Housed in a 2-SMD square end block measuring 6.10 mm x 2.69 mm x 2.69 mm, the 04513.15MRL occupies the same footprint as other NANO² 451 fuses — the pad layout is shared across the current ratings in the series, so a single PCB pattern serves multiple BOM variants. Surface-mount construction suits reflow assembly. ## Approvals and compliance Carries CSA, PSE, and UL recognition — the UL listing covers the 125 V AC/DC rating and 50 A interrupting capacity, which is the standard a safety engineer needs for a secondary-side fuse in equipment sold into North America.","metaTitle":"04513.15MRL Littelfuse NANO² 451, 3.15A 125V Fast Blow SMD","metaDescription":"04513.15MRL Littelfuse NANO² 451 SMD fuse, 3.15A, 125V AC/DC, fast blow, 50A breaking capacity. Active production, sourced to order. Request a quote.","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) Cut Tape (CT)","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":"$1.4600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the key ratings for 04513.15MRL?","answer":"3.15 A current rating, 125 V AC and DC voltage rating, fast-blow response, 50 A breaking capacity at rated voltage, and a melting I²t of 1.92."},{"question":"What approvals does the 04513.15MRL carry?","answer":"CSA, PSE, and UL recognition are listed for this fuse."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/04513.15MRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/04513.15MRL 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}}