{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451002.NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451002.NR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451002.NR","factsUrl":"https://icboms.com/api/mcp/products/0451002.NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, Board Mount (Cartridge Style Excluded) fuse, 0451002.NR, 2 A, 125 VAC/125 VDC, Fast Blow, 2-SMD Square End Block, Tape & Reel.","salesMarkdown":"## 2 A fast-blow SMD fuse — what the ratings mean for fit The 0451002.NR: Rated 2 A continuous at both 125 VAC and 125 VDC. The fast-blow response time means it clears quickly on overcurrent — no intentional delay for inrush. The 50 A breaking capacity at rated voltage tells you it can safely interrupt a fault current up to that level without rupturing; this is the figure that governs whether the fuse clears a short-circuit event in your circuit without cascading damage. Melting I²t is 0.53 — this is the energy needed to melt the fuse element. It matters for sizing the fuse against inrush pulses: if your load's surge energy exceeds this value, the fuse will open on turn-on. The DC cold resistance is 0.0367 Ohms, so the voltage drop at 2 A is about 73 mV — negligible in most low-voltage rails. Housed in a 2-SMD square end block package with dimensions 6.10 mm x 2.69 mm x 2.69 mm. Surface-mount, supplied on Tape & Reel. ## Approvals and temperature range Approved by CSA, PSE, and UL — accepted in North American and Japanese regulatory jurisdictions.","metaTitle":"0451002.NR Littelfuse NANO² 451 2A Fast Blow SMD Fuse","metaDescription":"Littelfuse 0451002.NR NANO² 451 2A fast-blow SMD fuse, 125VAC/DC, 50A breaking capacity. Obsolete — sourced to order against RFQ via independent channels.","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":"0.53","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":"0.0367 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"2 A","Operating Temperature":"-55°C~125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.9500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 0451002.NR?","answer":"Since it is obsolete, stock is limited to surplus and broker inventory."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451002.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/0451002.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}}