{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"045103.5NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"045103.5NR","canonicalUrl":"https://icboms.com/littelfuse-inc/045103.5NR","factsUrl":"https://icboms.com/api/mcp/products/045103.5NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount (Cartridge Style Excluded) fuse, 045103.5NR, 3.5 A, 125 V AC/DC, Fast Blow, 2-SMD Square End Block, Tape & Reel.","salesMarkdown":"## What this 3.5 A fast-blow SMD fuse protects The Littelfuse 045103.5NR is a 3.5 A fast-blow fuse in the NANO² 451 series, housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm. It is rated for 125 V AC and 125 V DC, with a breaking capacity of 50 A at rated voltage — meaning it safely interrupts a fault current up to 50 A without rupturing the package. The fast-blow response time clears overcurrents quickly, making it suitable for protecting sensitive circuits where a brief overload could damage downstream components. The 2.469 melting I²t value gives a coordination point for sizing upstream protection and predicting let-through energy during a fault. ## Obsolete — sourcing path and compliance Littelfuse has marked the 045103.5NR as obsolete. The fuse carries CSA, PSE, and UL approvals, so it meets the safety agency requirements for North American and Japanese markets.","metaTitle":"Littelfuse 045103.5NR NANO² 451 Fuse, 3.5A, 125V, Fast Blow","metaDescription":"Littelfuse 045103.5NR NANO² 451 fast-blow surface-mount fuse, 3.5A at 125V AC/DC, 50A breaking capacity. Obsolete — sourced to order 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":"2.469","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":"0.02 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"3.5 A","Operating Temperature":"-55°C~125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.7000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 045103.5NR and get a price?","answer":"The 045103.5NR is sourced to order through independent surplus and broker channels."},{"question":"What is the breaking capacity of the 045103.5NR?","answer":"The breaking capacity is 50 A at the rated voltage of 125 V AC or DC. This is the maximum fault current the fuse can safely interrupt without rupturing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/045103.5NR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/045103.5NR 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}}