{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"045101.6NRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"045101.6NRL","canonicalUrl":"https://icboms.com/littelfuse-inc/045101.6NRL","factsUrl":"https://icboms.com/api/mcp/products/045101.6NRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount (Cartridge Style Excluded) fuse, 1.6 A, 125 VAC/125 VDC, Fast Blow, 50 A breaking capacity, 2-SMD square end block package, Tape & Reel.","salesMarkdown":"## What this 1.6 A fast-blow fuse does on the board The 045101.6NRL is a Littelfuse NANO²® 451 series surface-mount fuse rated 1.6 A at 125 VAC and 125 VDC with a fast-blow response time. It comes in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, supplied on Tape & Reel for pick-and-place assembly. The 50 A breaking capacity at rated voltage means it can safely interrupt a fault current up to that level without rupturing or sustaining an arc — critical for protecting downstream traces and components in a 125 V rail. ## Breaking capacity and I²t — the numbers that matter for protection With a melting I²t of 1.06 A²s and a DC cold resistance of 0.058 Ohms, this fuse opens fast on a hard short — the I²t value tells you the energy let-through before the element clears, which is the figure the PCB trace width calculation and the downstream semiconductor surge rating need to see. The 50 A interrupting rating at 125 VAC/VDC is the same for both AC and DC circuits — unusual for a small SMD fuse, where DC breaking is often derated. That dual-voltage spec simplifies BOM planning for boards that see both a 125 VAC mains-derived rail and a 125 VDC battery bus. ## Approvals and compliance for global equipment The 045101.6NRL carries CSA, PSE, and UL approvals — covering North American and Japanese regulatory acceptance. For a power supply or telecom board shipping into those markets, this fuse meets the safety agency listing requirements without a separate component qualification. Operating temperature range is -55°C to 125°C, which covers both commercial and industrial ambient conditions — the fuse does not derate significantly across the band, so the 1.6 A rating holds in a hot enclosure near a power stage.","metaTitle":"Littelfuse 045101.6NRL NANO² 451 Fuse, 1.6 A, 125 V","metaDescription":"Littelfuse 045101.6NRL NANO² 451 surface-mount fuse, 1.6 A, 125 VAC/VDC, fast blow, 50 A breaking capacity. Active production. Sourced per RFQ.","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)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"1.06","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":"0.058 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"1.6 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5926","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the breaking capacity of 045101.6NRL at 125 V?","answer":"The breaking capacity is 50 A at the rated 125 VAC and 125 VDC — sufficient for interrupting fault currents in typical low-power board-level circuits without cascading failure."},{"question":"What approvals does 045101.6NRL carry?","answer":"The fuse is approved by CSA, PSE, and UL — covering North American and Japanese safety agency requirements for equipment-level circuit protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/045101.6NRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/045101.6NRL 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}}