{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451007.NRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451007.NRL","canonicalUrl":"https://icboms.com/littelfuse-inc/0451007.NRL","factsUrl":"https://icboms.com/api/mcp/products/0451007.NRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, 0451007.NRL, 7 A, 125 V AC/DC, fast-blow, surface-mount fuse, 2-SMD square end block package, 50 A breaking capacity.","salesMarkdown":"## What the 7 A rating means for your board The 0451007.NRL is a Littelfuse NANO²® 451 series fast-blow surface-mount fuse rated 7 A continuous at both 125 V AC and 125 V DC. The 50 A breaking capacity at rated voltage means it safely interrupts a fault current up to that level without rupturing the package or sustaining an arc — critical for clearing a hard short on a 125 V rail where the available fault current can exceed the fuse's own continuous rating by an order of magnitude. ## Fast-blow response and melting I²t The fast-blow characteristic means the fuse element is designed to open quickly on overcurrent — no intentional thermal delay. The melting I²t of 10.32 A²s is the energy required to melt the element; for a downstream semiconductor (rectifier, MOSFET, DC-DC converter), the fuse must clear before the device's own I²t rating is exceeded. A 7 A fast-blow with this I²t typically coordinates with a 10 A or 12 A silicon junction in a 125 V rail. ## Package, footprint, and temperature envelope Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, the 0451007.NRL mounts on the board surface — no through-hole leads, so the reflow profile must match the solder paste's peak temperature.","metaTitle":"0451007.NRL Littelfuse NANO² 451 7A Fast-Blow SMD Fuse","metaDescription":"0451007.NRL Littelfuse NANO² 451 series 7A fast-blow SMD fuse, 125V AC/DC, 50A breaking capacity, -55°C to 125°C. Active production, 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":"10.32","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Active","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":"0.009 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"7 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":"What compliance documentation does Littelfuse provide for 0451007.NRL?","answer":"The fuse is approved by CSA, PSE, and UL. Littelfuse typically provides RoHS and REACH compliance declarations for the NANO² 451 series; confirm the specific document revision at the time of ordering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451007.NRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451007.NRL 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}}