{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.750NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.750NR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.750NR","factsUrl":"https://icboms.com/api/mcp/products/0451.750NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount Surface Mount Fuse, Fast Blow, 750 mA, 125 VAC/DC, 50 A breaking capacity, 2-SMD Square End Block package, Tape & Reel.","salesMarkdown":"## 750 mA fast-blow fuse for secondary-side overcurrent protection The 0451.750NR is a 750 mA fast-blow surface-mount fuse from the Littelfuse NANO² 451 series, designed for board-level overcurrent protection on 125 VAC or 125 VDC rails. Its 50 A breaking capacity at rated voltage means it safely interrupts fault currents up to that level without rupturing — adequate for secondary-side power supplies and control circuits where the available fault current stays below 50 A. The 0.185 melting I²t gives the energy needed to clear the element; a downstream semiconductor rated for less I²t withstand will fail before the fuse opens unless coordinated. ## Obsolete — sourced through independent channels For new designs, consider a current-production NANO² 451 variant with the same package footprint and voltage rating, but verify the I²t and breaking capacity against the BOM requirement. ## Surface-mount footprint and environmental range Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, the fuse sits flat on the PCB with end-cap terminations — no through-hole leads, so the layout uses standard SMD pads with no drilled holes. ## CSA and UL approvals for North American markets The fuse carries CSA and UL approval agency marks — accepted in equipment destined for North American regulatory review without additional fuse testing.","metaTitle":"0451.750NR Littelfuse NANO² 451 Fuse, 750 mA, Fast Blow","metaDescription":"Littelfuse 0451.750NR NANO² 451 surface-mount fuse, 750 mA, 125 VAC/DC, 50 A breaking capacity. Obsolete — sourced to order. CSA, UL approved.","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":"0.185","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":"0.245 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"750 mA","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.9500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.750NR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.750NR 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}}