{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.750MRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.750MRL","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.750MRL","factsUrl":"https://icboms.com/api/mcp/products/0451.750MRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount Surface Mount Fuse, 750 mA, 125 V AC/DC, Fast Blow, 50 A Breaking Capacity, 2-SMD Square End Block Package.","salesMarkdown":"## 750 mA fast-blow protection for tight board-level circuits The Littelfuse 0451.750MRL is a 750 mA fast-blow surface-mount fuse from the NANO²® 451 series, rated for 125 V AC and DC circuits with a 50 A interrupting capacity at rated voltage. The fast-blow response clears quickly on overcurrents above the rating, making it suited for protecting sensitive electronics where a brief overload could damage downstream silicon. A melting I²t of 0.185 defines the energy needed to open the fuse element — useful for coordinating with inrush currents from capacitive loads or for ensuring the fuse does not nuisance-blow on normal startup transients. ## 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 0451.750MRL mounts directly to the PCB and reflows alongside standard passive components. The DC cold resistance of 0.245 Ohms is low enough that self-heating at rated current stays within the package's thermal limits. ## Approvals and compliance coverage The 0451.750MRL carries CSA and UL approvals, confirming it meets North American safety standards for overcurrent protection in board-level circuits.","metaTitle":"Littelfuse 0451.750MRL NANO² 451 Fuse, 750 mA, Fast Blow","metaDescription":"Littelfuse 0451.750MRL NANO²® 451 surface-mount fuse, 750 mA, 125 V, fast-blow, 50 A breaking capacity. Active production, sourced per 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":"0.185","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Active","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":"$1.4600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How can I get pricing and availability for the 0451.750MRL?","answer":"Current pricing and stock levels are confirmed at quote time — submit an RFQ for a firm quote with lead time."},{"question":"What approvals does the 0451.750MRL carry?","answer":"The fuse is approved by CSA and UL, certifying compliance with North American safety standards for overcurrent protection in board-mount applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.750MRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.750MRL 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}}