{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451003.NRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451003.NRL","canonicalUrl":"https://icboms.com/littelfuse-inc/0451003.NRL","factsUrl":"https://icboms.com/api/mcp/products/0451003.NRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, board mount SMD fuse, 0451003.NRL, 3 A, 125 VAC/125 VDC, fast-blow, 50 A breaking capacity, 2-SMD package, Tape & Reel.","salesMarkdown":"## 3 A fast-blow SMD fuse for 125 VDC rail protection The Littelfuse 0451003.NRL is a 3 A, 125 VAC/125 VDC fast-blow fuse in the NANO²® 451 series, designed for surface-mount board-level overcurrent protection where a small footprint and automated assembly are required. Rated for 50 A breaking capacity at 125 V, this fuse is suited for secondary-side protection in DC-DC converter outputs, point-of-load regulators, and telecom line cards — not for primary panel-level fault interruption where higher interrupt ratings are needed. The fast-blow response time means it clears quickly on overcurrent events, making it a good match for protecting sensitive semiconductor loads like ASICs, FPGAs, and memory banks that cannot tolerate sustained fault current. ## Melting I²t and DC resistance for coordination With a melting I²t of 1.65 A²s, this fuse can withstand brief inrush currents from capacitive loads — a 100 µF input capacitor charging from 125 VDC produces an inrush energy well below this threshold, so nuisance blowing is unlikely. ## SMD package and assembly fit Housed in a 2-SMD, square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, the 0451003.NRL fits standard pick-and-place equipment and reflow soldering profiles — no manual handling required. Available in Tape & Reel (TR) for volume production or Cut Tape (CT) for prototype and low-volume builds — the reel quantity supports automated assembly without reel changeovers for moderate batch sizes. ## Regulatory approvals and compliance The 0451003.NRL carries CSA, PSE, and UL approvals — accepted in North American and Japanese markets without additional agency review for most equipment-level safety certifications.","metaTitle":"Littelfuse 0451003.NRL NANO² 451 Fuse, 3 A, 125 V, Fast Blow","metaDescription":"Littelfuse 0451003.NRL NANO² 451 SMD fuse, 3 A, 125 VAC/VDC, fast-blow, 50 A breaking capacity, UL/CSA/PSE approved. 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":"1.65","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":"0.0227 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"3 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 0451003.NRL at 125 V?","answer":"The fuse is rated for 50 A breaking capacity at both 125 VAC and 125 VDC. This is adequate for secondary-side protection in most DC-DC converter and point-of-load applications."},{"question":"What approvals does the 0451003.NRL carry?","answer":"The fuse is approved by CSA, PSE, and UL, covering North American and Japanese regulatory requirements for equipment-level safety certification."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451003.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/0451003.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}}