{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"XT5NU440ATFF000XXX","brand":"ABB","brandSlug":"abb","productSlug":"XT5NU440ATFF000XXX","canonicalUrl":"https://aoctrl.com/abb/XT5NU440ATFF000XXX","factsUrl":"https://aoctrl.com/api/mcp/products/XT5NU440ATFF000XXX","rawCanonicalId":null},"summary":{"shortDescription":"ABB, XT5N series, 400 A breaking part, 4-pole, F F, UL/CSA+TU, order code XT5NU440ATFF000XXX.","salesMarkdown":"The ABB XT5NU440ATFF000XXX is a 400 A breaking part for the XT5N molded-case circuit breaker platform, configured as a 4-pole unit with F F (front-front) terminations and UL/CSA+TU certification. This is a field-replaceable internal subassembly — the breaking part carries the arc chambers, contacts, and trip mechanism that actually interrupt fault current. It is not a standalone breaker; it mounts inside the XT5N frame during assembly or as a service replacement when the original interrupting module is damaged or needs a different rating. ## What the approvals tell you The UL/CSA+TU marking on this breaking part means it carries UL and CSA certification for the North American market, plus TU (Technischer Überwachungsverein) approval for the German and broader European market. That dual certification simplifies panel builds that need to satisfy both IEC and NEC code requirements — one part number covers both jurisdictions.","metaTitle":"ABB XT5NU440ATFF000XXX XT5N 400A 4P F F UL/CSA Breaking Part","metaDescription":"ABB XT5NU440ATFF000XXX XT5N 400A 4-pole breaking part with UL/CSA approvals. Lifecycle stage current. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"title":"XT5NU440ATFF000XXX","description":"XT5N 400 BREAKING PART 4P F F UL/CSA+TU|XT5N 400 BREAKING PART 4P F F UL/CSA+TU","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5afe453d32ff007ed87de41411768891.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy XT5NU440ATFF000XXX?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is XT5NU440ATFF000XXX's listed lifecycle_stage?","answer":"The lifecycle stage is current."},{"question":"What is XT5NU440ATFF000XXX's listed description?","answer":"The description is XT5N 400 BREAKING PART 4P F F UL/CSA+TU."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/XT5NU440ATFF000XXX","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/abb/XT5NU440ATFF000XXX when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}