{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451002.MRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451002.MRL","canonicalUrl":"https://icboms.com/littelfuse-inc/0451002.MRL","factsUrl":"https://icboms.com/api/mcp/products/0451002.MRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, 0451002.MRL, Board Mount SMD Fuse, 2 A, 125 V AC/DC, Fast Blow, 50 A breaking capacity, 2-SMD square end block package.","salesMarkdown":"## 2 A fast-blow SMD fuse for secondary-side protection The Littelfuse 0451002.MRL is a 2 A fast-blow surface-mount fuse from the NANO²® 451 series, designed for board-level overcurrent protection where space is constrained and a quick open on fault is required. Rated for 125 V AC and 125 V DC circuits, it fits secondary-side power rails, DC-DC converter inputs, and low-voltage DC bus protection in telecom, industrial control, and consumer electronics. ## Fast-blow response and inrush withstand The fast-blow response clears the fuse quickly on a sustained overcurrent, but the 0.53 melting I²t gives it enough energy tolerance to ride through capacitor-charging inrush or brief current spikes without nuisance opening. A 50 A breaking capacity at rated voltage means the fuse can safely interrupt a fault current up to that level without rupturing or sustaining an arc — sufficient for most secondary-side supplies where the upstream source impedance limits fault current. ## Surface-mount package and thermal range Housed in a 2-SMD square end block measuring 6.10 mm x 2.69 mm x 2.69 mm, the 0451002.MRL is pick-and-place compatible and suits high-density PCB layouts where a through-hole cartridge fuse would not fit. ## Regulatory acceptance and sourcing posture Approved by CSA, PSE, and UL — the fuse carries the certifications needed for equipment sold into North American and Japanese markets without additional agency review.","metaTitle":"Littelfuse 0451002.MRL NANO²® 451 SMD Fuse, 2A Fast Blow","metaDescription":"Littelfuse 0451002.MRL NANO²® 451 surface-mount fuse, 2A fast blow, 125V AC/DC, 50A breaking capacity. Active lifecycle, 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) Cut Tape (CT)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"0.53","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Active","Approval Agency":"CSA, PSE, 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":"0.0367 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"2 A","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":"Where can I buy the 0451002.MRL and check availability?","answer":"The 0451002.MRL is sourced to order against your BOM quantity through independent distribution."},{"question":"What is the 0451002.MRL's breaking capacity?","answer":"The fuse is rated for 50 A breaking capacity at its rated 125 V AC/DC, sufficient for interrupting secondary-side fault currents in most telecom and industrial supplies."},{"question":"What approvals does the 0451002.MRL carry?","answer":"The fuse is approved by CSA, PSE, and UL, covering North American and Japanese regulatory acceptance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451002.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/0451002.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}}