{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"045101.6MRSN","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"045101.6MRSN","canonicalUrl":"https://icboms.com/littelfuse-inc/045101.6MRSN","factsUrl":"https://icboms.com/api/mcp/products/045101.6MRSN","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, 045101.6MRSN, board-mount SMD fast-blow fuse, 1.6 A, 125 VAC, 50 A breaking capacity, 2-SMD square end block package, Tape & Reel.","salesMarkdown":"## SMD fast-blow fuse for secondary-side protection The 045101.6MRSN is a 1.6 A, 125 VAC fast-blow SMD fuse from Littelfuse's NANO² 451 series. It is designed for board-level overcurrent protection where fast response to short-circuit faults is required. Rated breaking capacity is 50 A at the rated voltage — sufficient for interrupting fault currents in most secondary-side DC/DC converter outputs, point-of-load regulators, and low-power AC circuits without rupturing the package. The melting I²t of 1.06 gives a clear window for inrush coordination: a capacitor bank or motor start drawing a transient above 1.6 A must clear before the fuse element reaches its melting energy threshold. ## Package, mounting, and thermal envelope Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, the fuse mounts directly onto the PCB footprint with standard reflow soldering. The Tape & Reel packaging supports automated pick-and-place for volume assembly. The cold DC resistance of 0.058 Ω keeps voltage drop and self-heating low at rated current. Approved by CSA and UR — the fuse carries North American safety certification for use in equipment listed to UL 248-14 and CSA C22.2 No. 248.14. ## Lifecycle and supply posture No minimum order quantity restrictions beyond the standard reel increment.","metaTitle":"045101.6MRSN Littelfuse NANO² 451 Fast-Blow SMD Fuse, 1.6 A","metaDescription":"045101.6MRSN Littelfuse NANO² 451 SMD fuse, 1.6 A, 125 VAC, fast-blow, 50 A breaking capacity, -55 to 125 °C. Active production, available 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":"1.06","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":"0.058 Ohms","Voltage Rating - AC":"125 V","Current Rating (Amps)":"1.6 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4614","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What approvals does the 045101.6MRSN carry?","answer":"The fuse carries CSA and UR approval, certifying compliance with UL 248-14 and CSA C22.2 No. 248.14 for North American safety requirements."},{"question":"What is the breaking capacity of the 045101.6MRSN?","answer":"The breaking capacity is 50 A at the rated voltage of 125 VAC. This is the maximum fault current the fuse can safely interrupt without rupturing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/045101.6MRSN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/045101.6MRSN 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}}