{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.800NRL","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.800NRL","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.800NRL","factsUrl":"https://icboms.com/api/mcp/products/0451.800NRL","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 Series, Board Mount Surface Mount Fuse, Fast Blow, 800 mA, 125 V AC/DC, 50 A Breaking Capacity, 2-SMD Square End Block, Tape & Reel.","salesMarkdown":"## 800 mA fast-blow SMD fuse for secondary-side protection The Littelfuse 0451.800NRL is an 800 mA fast-blow surface-mount fuse from the NANO²® 451 series, rated for 125 V AC and 125 V DC with a breaking capacity of 50 A at rated voltage. The 0.271 melting I²t value lets you coordinate this fuse with downstream traces and semiconductor ratings — the energy let-through is low enough to protect a 125 V rail feeding a DC-DC converter or a control transformer secondary. Approved under CSA and UL, so it passes the panel-level certification for industrial control equipment and power supplies shipped into North America. ## Package, footprint, and storage note Housed in a 2-SMD square end block measuring 6.10 mm x 2.69 mm x 2.69 mm — the same footprint as the rest of the NANO² 451 family, so a single pad layout serves multiple current ratings on the same BOM.","metaTitle":"0451.800NRL Littelfuse NANO² 451 Fuse, 800 mA, 125 V","metaDescription":"0451.800NRL Littelfuse NANO²® 451 surface mount fuse, 800 mA, 125 V AC/DC, fast blow, 50 A breaking capacity, CSA/UL approved.","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":"0.271","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":"0.212 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"800 mA","Operating Temperature":"-55°C~125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6002","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 0451.800NRL and get a price?","answer":"The 0451.800NRL is sourced to order through independent and authorized distribution channels."},{"question":"What compliance documentation does Littelfuse provide for 0451.800NRL?","answer":"The fuse carries CSA and UL approvals for North American panel certification. RoHS and REACH compliance documentation is standard for the NANO² 451 series and is available upon request with the order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.800NRL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.800NRL 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}}