{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"045101.5NRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"045101.5NRL","canonicalUrl":"https://icboms.com/littelfuse-inc/045101.5NRL","factsUrl":"https://icboms.com/api/mcp/products/045101.5NRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, 045101.5NRL, board mount SMD fuse, 1.5 A, 125 VAC/VDC, fast blow, 2-SMD square end block package, 50 A breaking capacity.","salesMarkdown":"## What the 1.5 A rating and 50 A breaking capacity mean for your board The 045101.5NRL is a 1.5 A fast-blow fuse in the NANO² 451 series, rated for 125 VAC and 125 VDC. The 50 A breaking capacity at rated voltage means it safely interrupts a fault current up to 50 A 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 rating. ## Melting I²t and cold resistance — sizing for inrush and voltage drop With a melting I²t of 0.853 A²s, this fuse tolerates brief inrush pulses from capacitive or inductive loads without nuisance opening — a 10 ms pulse at 9 A draws roughly 0.81 A²s, leaving a small margin before the element reaches its melting point. The 0.063 ohm DC cold resistance at 25 °C produces a voltage drop of under 95 mV at rated current, negligible for a 125 V supply but worth checking if the load is a low-voltage rail downstream of a regulator. ## Surface-mount package and temperature range Housed in a 2-SMD square end block measuring 6.10 mm x 2.69 mm x 2.69 mm, the 045101.5NRL mounts directly to the PCB pad pattern typical for 2410-size chip fuses. ## Compliance and approvals Approved by CSA, PSE, and UL — the UL listing confirms the fuse meets the standard for branch-circuit protection in North American equipment, while PSE opens the Japanese market.","metaTitle":"045101.5NRL Littelfuse NANO² 451 SMD Fuse, 1.5 A, 125 V","metaDescription":"045101.5NRL Littelfuse NANO² 451 SMD fuse, 1.5 A, 125 VAC/VDC, fast blow, 50 A breaking capacity. Active production, sourced per RFQ. CSA, PSE, UL approved.","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":"0.853","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":"0.063 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"1.5 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 approvals does 045101.5NRL carry?","answer":"The fuse is approved by CSA, PSE, and UL. These cover North American equipment safety (UL), Canadian standards (CSA), and Japanese market compliance (PSE)."},{"question":"What is the melting I²t of 045101.5NRL and why does it matter?","answer":"The melting I²t is 0.853 A²s. This value determines how much inrush energy the fuse can absorb before opening — useful for coordinating with downstream components and avoiding nuisance trips during startup."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/045101.5NRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/045101.5NRL 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}}