{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451002.MR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451002.MR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451002.MR","factsUrl":"https://icboms.com/api/mcp/products/0451002.MR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount SMD fuse, 0451002.MR, 2 A, 125 V AC/DC, Fast Blow, 50 A breaking capacity, 2-SMD square end block package.","salesMarkdown":"## What the 2 A rating means for your board The 0451002.MR is a 2 A fast-blow SMD fuse from the Littelfuse NANO²® 451 series, rated for 125 V AC and 125 V DC. The 2 A current rating is the continuous current the fuse can carry without opening under normal conditions — it is the nominal rating, not a trip threshold. A sustained overload above 2 A will clear the fuse within the fast-blow response curve, which is specified by the melting I²t of 0.53 A²s. The 50 A breaking capacity at rated voltage means the fuse can safely interrupt a fault current up to 50 A without rupturing or sustaining an arc — critical for DC circuits where arcs are harder to extinguish. Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, this fuse is a surface-mount device intended for reflow soldering. The package footprint is compatible with standard pick-and-place equipment, and the tape-and-reel packaging (Cut Tape also available) supports volume assembly. ## Lifecycle reality — obsolete, sourced to order Littelfuse has marked the 0451002.MR as obsolete. This means the manufacturer no longer produces the part; any remaining inventory is in the distribution channel or surplus market.","metaTitle":"0451002.MR Littelfuse NANO² 451 2A Fast Blow SMD Fuse","metaDescription":"Littelfuse 0451002.MR NANO² 451 2A fast-blow SMD fuse, 125V AC/DC, 50A breaking capacity. Obsolete — sourced to order against RFQ.","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) Cut Tape (CT)","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":"$1.4600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 0451002.MR or check stock?","answer":"The 0451002.MR is obsolete but available to order through independent distribution. Submit an RFQ for current availability and pricing — no stock count is held on this listing."},{"question":"What is the closest alternative to 0451002.MR in the NANO² 451 series?","answer":"A parametric search for a 2 A, 125 V, fast-blow SMD fuse in a similar package (2-SMD square end block) is the recommended approach for a replacement."},{"question":"What compliance documentation does Littelfuse provide for 0451002.MR?","answer":"The fuse carries CSA, PSE, and UL approvals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451002.MR","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.MR 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}}