{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.062MRSN","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.062MRSN","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.062MRSN","factsUrl":"https://icboms.com/api/mcp/products/0451.062MRSN","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount SMD Fuse, Fast Blow, 62 mA, 125 VAC, 50 A breaking capacity, 2-SMD square end block package, Tape & Reel.","salesMarkdown":"## 62 mA fast-blow SMD fuse for secondary-side protection The Littelfuse 0451.062MRSN is a 62 mA, 125 VAC fast-blow SMD fuse from the NANO²® 451 series, housed in a compact 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm. With a breaking capacity of 50 A at rated voltage, it safely interrupts overcurrent faults up to that level without rupturing, making it suitable for secondary-side protection in power supplies, battery management circuits, and low-current DC/DC converter rails. ## What the ratings mean for your BOM fit The 62 mA current rating is the continuous current the fuse carries without opening — budget a 20–25 % derating margin below the circuit's normal operating current to avoid nuisance blowing at elevated ambient temperatures. The 125 VAC voltage rating covers most secondary-side rails in off-line supplies; the fast-blow response time means it clears quickly on short-circuit faults, but it may nuisance-open on moderate inrush pulses that exceed the melting I²t of 0.00019 A²s. ## Lifecycle and supply posture Approved by CSA and UR (UL Recognized), the fuse meets North American safety agency requirements for recognized component use in end equipment.","metaTitle":"Littelfuse 0451.062MRSN NANO² 451 SMD Fuse, 62 mA, 125 VAC","metaDescription":"Littelfuse 0451.062MRSN NANO² 451 SMD fuse, 62 mA, 125 VAC, fast blow, 50 A breaking capacity. Active production. Sourced to order. Request a quote.","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)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"0.00019","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Active","Approval Agency":"CSA, UR","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":"5.5 Ohms","Voltage Rating - AC":"125 V","Current Rating (Amps)":"62 mA","Operating Temperature":"-55°C~125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.1332","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/0451.062MRSN/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the 0451.062MRSN in the NANO² 451 series?","answer":"The NANO² 451 series includes multiple current ratings in the same 2-SMD square end block package and footprint. Any other 451-series fuse with the same package dimensions is a drop-in replacement for a different current rating; no single pin-compatible alternative exists for the exact 62 mA rating."},{"question":"What compliance documentation does Littelfuse provide for the 0451.062MRSN?","answer":"The fuse carries CSA and UR (UL Recognized) approvals. RoHS and REACH compliance documentation is typically available from Littelfuse upon request; the approvals confirm the fuse meets North American safety agency standards for recognized components."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.062MRSN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.062MRSN 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}}