{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451005.MRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451005.MRL","canonicalUrl":"https://icboms.com/littelfuse-inc/0451005.MRL","factsUrl":"https://icboms.com/api/mcp/products/0451005.MRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, board-mount surface-mount fuse, 0451005.MRL, 5 A, 125 V AC/DC, fast blow, 50 A breaking capacity, 2-SMD square end block package.","salesMarkdown":"## Breaking capacity and I²t coordination The 0451005.MRL: Breaking capacity is 50 A at the rated voltage — sufficient for interrupting faults in low-power DC rails or AC control circuits without cascading failure. The melting I²t of 5.566 lets you coordinate with downstream semiconductors or PCB traces: a downstream component with an I²t rating above this value will survive the clearing event. ## Package, mounting, and temperature range Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, this fuse is designed for automated pick-and-place assembly onto a PCB. The surface-mount footprint mates with standard solder pads; the square end block provides stable solder joint formation during reflow. ## Regulatory approvals and sourcing posture Approved by CSA, PSE, and UL — the UL listing confirms compliance with UL 248-14 for supplementary protectors, while PSE opens the Japanese market. Available in Tape & Reel (TR) or Cut Tape (CT) to match production volume.","metaTitle":"0451005.MRL Littelfuse NANO² 451 Fuse, 5A, 125V, Fast Blow","metaDescription":"0451005.MRL Littelfuse NANO² 451 surface-mount fuse, 5 A, 125 V AC/DC, fast blow. Active production. CSA/PSE/UL approved. Sourced to order against 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); Cut Tape (CT)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"5.566","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":"0.0125 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"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/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the breaking capacity of 0451005.MRL?","answer":"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."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451005.MRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451005.MRL 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}}