{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.500MRSN","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.500MRSN","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.500MRSN","factsUrl":"https://icboms.com/api/mcp/products/0451.500MRSN","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount (Cartridge Style Excluded) fuse, 0451.500MRSN, 500 mA, 125 VAC, 50 A breaking capacity, Fast Blow, 2-SMD Square End Block package, Tape & Reel.","salesMarkdown":"## 500 mA fast-blow SMD fuse for secondary-side protection The Littelfuse 0451.500MRSN is a 500 mA fast-blow surface-mount fuse from the NANO²® 451 series, rated for 125 VAC with a 50 A breaking capacity at rated voltage. The 0.0795 melting I²t and 0.42 Ohms DC cold resistance define the energy-to-clear and voltage drop in the circuit — the low I²t keeps downstream silicon safe during a fault, while the resistance matters for IR-drop in low-voltage rails.","metaTitle":"Littelfuse 0451.500MRSN NANO² 451 Fuse, 500 mA, 125 VAC","metaDescription":"Littelfuse 0451.500MRSN NANO² 451 surface-mount fuse, 500 mA, 125 VAC, fast blow, 50 A breaking capacity. Active production, sourced to order.","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":"0.0795","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":"0.42 Ohms","Voltage Rating - AC":"125 V","Current Rating (Amps)":"500 mA","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4614","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/0451.500MRSN/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 0451.500MRSN at 125 VAC?","answer":"The fuse is rated for 50 A breaking capacity at 125 VAC — it safely interrupts a fault current up to that level without rupturing or sustaining an arc."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.500MRSN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.500MRSN 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}}