{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451012.MRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451012.MRL","canonicalUrl":"https://icboms.com/littelfuse-inc/0451012.MRL","factsUrl":"https://icboms.com/api/mcp/products/0451012.MRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, surface-mount fast-blow fuse, 0451012.MRL, 12 A, 65 V AC/DC, 50 A breaking capacity, 2-SMD square end block package, -55°C to 125°C.","salesMarkdown":"## 12 A fast-blow SMT fuse for board-level protection The Littelfuse 0451012.MRL is a 12 A fast-blow surface-mount fuse from the NANO² 451 series, rated for 65 V AC and DC circuits. Its 50 A interrupting capacity at rated voltage means it can safely clear a short-circuit fault up to that level without rupturing — essential for protecting downstream silicon on a crowded PCB. ## Parametric fit for your rail Rated 12 A continuous with a cold DC resistance of 0.0049 ohms — the voltage drop at full load is negligible, under 60 mV, so it won't steal headroom from the load. Melting I²t of 47.97 A²s is the energy let-through before the fuse opens. Use this value to coordinate with downstream components: a MOSFET rated for 50 A²s pulsed avalanche energy will survive a fault behind this fuse; a smaller FET may not. Fast-blow response means it clears quickly on high-overcurrent events — typical for protecting sensitive ICs that can't tolerate sustained overcurrent. Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm. Supplied in Tape & Reel (TR) or Cut Tape (CT) for pick-and-place assembly.","metaTitle":"0451012.MRL Littelfuse NANO² 451 SMT Fuse, 12 A, 65 V","metaDescription":"0451012.MRL Littelfuse NANO² 451 surface-mount fuse, 12 A, 65 V AC/DC, fast blow, 50 A breaking capacity, -55 to 125°C. Active production, quoted 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":"47.97","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":"0.0049 Ohms","Voltage Rating - AC":"65 V","Voltage Rating - DC":"65 V","Current Rating (Amps)":"12 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 0451012.MRL?","answer":"The 0451012.MRL has a breaking capacity of 50 A at its rated voltage of 65 V AC/DC. This means it can safely interrupt a fault current up to 50 A without rupturing or causing a fire hazard."},{"question":"What approvals does the 0451012.MRL carry?","answer":"The fuse is approved by CSA and UL, indicating it meets North American safety standards for overcurrent protection in electronic equipment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451012.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/0451012.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}}