{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451005.NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451005.NR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451005.NR","factsUrl":"https://icboms.com/api/mcp/products/0451005.NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, board mount surface mount fuse, fast blow, 5 A, 125 V AC/DC, 50 A breaking capacity, 2-SMD square end block package, Tape & Reel.","salesMarkdown":"## 5 A fast-blow fuse for 125 V rails — NANO² 451 series The Littelfuse 0451005.NR is a 5 A fast-blow surface-mount fuse from the NANO² 451 series, rated for 125 V AC and DC circuits with a 50 A interrupting capacity at rated voltage. The 0.0125 Ohm cold resistance and 5.566 melting I²t figure let you coordinate the fuse with downstream components — the I²t tells you the energy let-through before the element opens, which matters for protecting semiconductor loads like rectifiers or DC-DC converters on the same rail. ## Surface-mount footprint and regulatory acceptance The 2-SMD square end block package (6.10 mm x 2.69 mm x 2.69 mm) suits reflow assembly on standard PCB pads — the body is the same width as the terminal pads, so the solder fillet wets the full end face. Approved by CSA, PSE, and UL — the fuse carries acceptance for North American and Japanese regulatory frameworks, which simplifies certification of the end equipment.","metaTitle":"Littelfuse 0451005.NR NANO² 451 Fuse, 5 A, 125 V, Fast Blow","metaDescription":"Littelfuse 0451005.NR NANO² 451 surface-mount fuse, 5 A, 125 V AC/DC, fast blow, 50 A breaking capacity.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Color":"-","Series":"NANO²® 451","Package":"Tape & Reel (TR)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"5.566","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Obsolete","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":"0.0125 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"5 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/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the breaking capacity of the 0451005.NR at 125 V?","answer":"The fuse is rated to interrupt 50 A at both 125 V AC and 125 V DC. This means it safely clears a fault current up to 50 A without rupturing the package — important for secondary-side protection in power supplies where the available fault current can exceed the fuse's continuous rating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451005.NR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451005.NR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}