{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451015.MRSN","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451015.MRSN","canonicalUrl":"https://icboms.com/littelfuse-inc/0451015.MRSN","factsUrl":"https://icboms.com/api/mcp/products/0451015.MRSN","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, 0451015.MRSN, 15 A fast-blow surface-mount fuse, 65 VAC/VDC, 2-SMD square end block package, 100 A AC / 150 A DC breaking capacity.","salesMarkdown":"## 15 A fast-blow in a 2-SMD square end block The 0451015.MRSN is a Littelfuse NANO²® 451 series surface-mount fuse rated 15 A continuous with a fast-blow response time — it opens within milliseconds on a moderate overcurrent, protecting downstream silicon before the fault energy climbs. The 2-SMD square end block package (6.10 mm x 2.69 mm x 2.69 mm) fits standard pick-and-place and reflow profiles, so it flows through the same line as the rest of the board. ## Breaking capacity and coordination Breaking capacity is 100 A AC and 150 A DC at the rated 65 V — that means the fuse can safely interrupt a fault current up to those levels without rupturing or arcing across the element. The melting I²t of 97.82 is the energy let-through before the fuse opens; use it to coordinate with upstream breakers and downstream semiconductor surge ratings so the fuse clears before the board traces vaporize. DC cold resistance is 0.0037 ohms — at 15 A the resistive power loss is under a watt, so the fuse stays cool in normal operation and the voltage drop across it is negligible for a 65 V rail.","metaTitle":"0451015.MRSN Littelfuse NANO² 451 Fuse, 15 A Fast-Blow, SMD","metaDescription":"0451015.MRSN Littelfuse NANO²® 451 surface-mount fuse, 15 A, 65 VAC/DC, fast-blow, 100 A/150 A breaking capacity. Active production, sourced per 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) Cut Tape (CT)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"97.82","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Active","Approval Agency":"CSA, METI, UR","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":"0.0037 Ohms","Voltage Rating - AC":"65 V","Voltage Rating - DC":"65 V","Current Rating (Amps)":"15 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"100A AC, 150A DC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451015.MRSN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451015.MRSN 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}}