{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"045106.3MR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"045106.3MR","canonicalUrl":"https://icboms.com/littelfuse-inc/045106.3MR","factsUrl":"https://icboms.com/api/mcp/products/045106.3MR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, Board Mount (Cartridge Style Excluded) fuse, 045106.3MR, 6.3 A, 125 VAC/VDC, Fast Blow, 2-SMD Square End Block, Tape & Reel.","salesMarkdown":"## Fast-blow SMD fuse, 6.3 A, 125 V — Littelfuse NANO² 451 The 045106.3MR is a Littelfuse NANO²® 451 series surface-mount fast-blow fuse, rated 6.3 A continuous at 125 VAC or 125 VDC. The 50 A interrupting rating at rated voltage means it can safely clear a short-circuit fault up to that level without rupturing the package. Its melting I²t of 9.17 A²s characterises the energy needed to open the element — useful for coordinating with downstream semiconductor devices that have a lower surge-withstand capability. The DC cold resistance is 0.0096 Ω, so at rated current the I²R loss is under 0.4 W, well within the SMD package's thermal budget. ## Obsolete — sourcing through independent channels Littelfuse lists the 045106.3MR as obsolete. Approvals from CSA, PSE, and UL cover the major North American and Asian regulatory jurisdictions for equipment-level safety certification. Housed in a 2-SMD square end-block package measuring 6.10 mm x 2.69 mm x 2.69 mm. The surface-mount footprint suits reflow assembly; the tape-and-reel packaging (TR) is compatible with standard pick-and-place feeders.","metaTitle":"045106.3MR Littelfuse NANO² 451 6.3A 125V Fast-Blow SMD Fuse","metaDescription":"Discontinued Littelfuse 045106.3MR NANO² 451 surface-mount fast-blow fuse, 6.3 A, 125 VAC/VDC, 50 A breaking capacity.","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":"9.17","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":"0.0096 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"6.3 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":"What compliance documentation does Littelfuse provide for 045106.3MR?","answer":"The 045106.3MR carries approvals from CSA, PSE, and UL. These cover North American and Japanese safety standards for overcurrent protection devices. RoHS and REACH compliance status should be confirmed against the manufacturer's latest documentation at time of order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/045106.3MR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/045106.3MR 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}}