{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451015.NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451015.NR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451015.NR","factsUrl":"https://icboms.com/api/mcp/products/0451015.NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount Surface Mount Fuse, 0451015.NR, 15 A, 65 V AC/DC, Fast Blow, 2-SMD Square End Block, CSA, UL.","salesMarkdown":"## What the 15 A rating means for the board The Littelfuse 0451015.NR is a 15 A fast-blow fuse in the NANO² 451 series, designed to open quickly on overcurrents before downstream silicon or PCB traces reach their thermal limits. Rated for 65 V on both AC and DC circuits, it fits common 48 V telecom, 24 V industrial, and 12 V automotive rails — the DC rating is the same as the AC rating, which simplifies BOM logic when the same fuse covers both domains. The 50 A breaking capacity at rated voltage means it can safely interrupt a fault current up to that level without rupturing the package — adequate for most secondary-side protection in equipment fed from a 10 A or smaller branch circuit. ## Fast-blow response and I²t for inrush decisions Fast-blow characteristic with a melting I²t of 97.82 — this is the energy the fuse element absorbs before opening. A downstream capacitor bank or motor start that draws a pulse above this threshold will nuisance-blow the fuse unless the pulse energy stays under the I²t rating. ## Obsolete — sourcing reality for the 0451015.NR For a BOM that already carries this fuse, the procurement path is through independent distribution channels where date-code provenance and lot traceability should be verified. No pin-compatible drop-in replacement is documented by the manufacturer; a parametric search for 15 A, 65 V, fast-blow, 2-SMD package fuses with comparable I²t and resistance will identify functional alternatives that require qualification testing. Housed in a 2-SMD square end-block package measuring 6.10 mm x 2.69 mm x 2.69 mm — the rectangular body with end-cap terminations reflows like a chip resistor. The pad layout should match the manufacturer's recommended land pattern for the 451 series to keep the solder fillet height within spec and avoid tombstoning during reflow. ## Compliance and approvals Carries CSA and UL approval agency marks — both standards require the fuse to clear its rated current at 65 V without sustained arcing or case rupture. These marks are accepted in North American panel and equipment listings without additional component-level testing.","metaTitle":"Littelfuse 0451015.NR NANO² 451 Fuse, 15 A, 65 V, Obsolete","metaDescription":"Littelfuse 0451015.NR NANO² 451 surface-mount fast-blow fuse, 15 A, 65 V AC/DC, 50 A breaking capacity. Obsolete — sourced to order against RFQ.","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":"97.82","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Obsolete","Approval Agency":"CSA, 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":"0.0037 Ohms","Voltage Rating - AC":"65 V","Voltage Rating - DC":"65 V","Current Rating (Amps)":"15 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.2800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the breaking capacity of the 0451015.NR?","answer":"50 A at the rated 65 V AC or DC. This is the maximum fault current the fuse can safely interrupt without rupturing; for secondary-side protection in equipment fed from a 10 A or smaller branch circuit, this is adequate."},{"question":"What compliance marks does the 0451015.NR carry?","answer":"CSA and UL approvals — both recognized in North America for overcurrent protection devices in industrial control panels and consumer equipment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451015.NR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451015.NR 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}}