{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451010.MRSN","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451010.MRSN","canonicalUrl":"https://icboms.com/littelfuse-inc/0451010.MRSN","factsUrl":"https://icboms.com/api/mcp/products/0451010.MRSN","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, 0451010.MRSN, 10 A, 125 V AC/DC, fast blow, surface mount, 2-SMD square end block package, 35 A breaking capacity.","salesMarkdown":"## 10 A fast-blow SMD fuse for board-level protection The 0451010.MRSN is a Littelfuse NANO²® 451 series surface-mount fuse rated for 10 A continuous current at 125 V AC or DC. Its fast-blow response time clears overcurrents quickly, making it suitable for protecting sensitive circuits where a time-delay characteristic could allow damage before the fuse opens. The 35 A breaking capacity at the rated voltage means it can safely interrupt fault currents up to that level without rupturing — adequate for most secondary-side DC rails and low-power AC branch circuits. ## Package and board-fit Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, this fuse occupies a compact footprint for dense PCB layouts. Surface-mount construction with a DC cold resistance of 0.0056 ohms minimizes voltage drop and I²R heating at rated current — the fuse runs cool in normal operation. ## Approvals and compliance Carries CSA, METI, and UR approvals, confirming acceptance in North American and Japanese regulatory frameworks for safety-critical overcurrent protection. The melting I²t of 26.46 A²s gives a measure of the energy let-through during clearing — useful for coordinating with downstream semiconductor ratings in a protection scheme.","metaTitle":"0451010.MRSN Littelfuse NANO² 451 10A Fast Blow SMD Fuse","metaDescription":"Active Littelfuse 0451010.MRSN NANO²® 451 SMD fuse, 10A, 125V AC/DC, fast blow, 35A breaking capacity. CSA, METI, UR approved. Sourced 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) Cut Tape (CT)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"26.46","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":"0.0056 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"10 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"35A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What approvals does 0451010.MRSN carry?","answer":"This fuse is approved by CSA (Canadian Standards Association), METI (Japanese Ministry of Economy, Trade and Industry), and UR (Underwriters Laboratories Recognized), covering North American and Japanese safety requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451010.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/0451010.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}}