{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.100NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.100NR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.100NR","factsUrl":"https://icboms.com/api/mcp/products/0451.100NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 Series, Board Mount Surface Mount Fuse, 0451.100NR, 100 mA, 125 V AC/DC, Fast Blow, 50 A Breaking Capacity, 2-SMD Square End Block Package.","salesMarkdown":"## 100 mA fast-blow fuse for secondary-side protection The Littelfuse 0451.100NR is a 100 mA fast-blow surface-mount fuse from the NANO² 451 series, rated for 125 V AC and 125 V DC with a 50 A interrupting capacity at rated voltage. This fuse is designed to protect sensitive downstream circuits from overcurrent faults in low-power DC rails or AC control lines, common in telecom, instrumentation, and industrial control boards. ## Package and board-fit considerations for rework Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, this fuse is suited for automated pick-and-place assembly and reflow soldering. Supplied in tape and reel packaging, it integrates directly into high-volume SMT lines without manual handling. ## Electrical characteristics and application fit With a melting I²t of 0.00138 and a cold DC resistance of 3.1 ohms, this fuse provides fast clearing for short-circuit events while tolerating brief inrush currents from capacitive loads or relay coils. ## Approvals and compliance for global equipment The 0451.100NR carries CSA and cULus approval agency markings, confirming it meets North American safety standards for overcurrent protection in end-user equipment. ## Sourcing this obsolete fuse for existing BOMs For existing designs that require this exact fuse, we source it through independent distribution channels — quantities and pricing are confirmed at RFQ time, and each reel is verified for authenticity and date code.","metaTitle":"Littelfuse 0451.100NR NANO² 451 Fuse, 100 mA, 125 V","metaDescription":"0451.100NR Littelfuse NANO² 451 surface mount fuse, 100 mA, 125 V AC/DC, fast blow, 50 A breaking capacity. Obsolete, sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Color":"-","Series":"NANO²® 451","Package":"Tape & Reel (TR)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"0.00138","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Obsolete","Approval Agency":"CSA, cULus","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":"3.1 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"100 mA","Operating Temperature":"-55°C~125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/93a301cacf56880fc0553832fd7cd1d0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the 0451.100NR's breaking capacity?","answer":"The fuse has a breaking capacity of 50 A at its rated voltage of 125 V AC or DC. This means it can safely interrupt a fault current up to 50 A without rupturing or causing a fire hazard."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.100NR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.100NR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}