{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"XT5NU340ABNF000XXX","brand":"ABB","brandSlug":"abb","productSlug":"XT5NU340ABNF000XXX","canonicalUrl":"https://aoctrl.com/abb/XT5NU340ABNF000XXX","factsUrl":"https://aoctrl.com/api/mcp/products/XT5NU340ABNF000XXX","rawCanonicalId":null},"summary":{"shortDescription":"ABB XT5N series, molded case circuit breaker, 3-pole, 400 A continuous, 690 VAC, TMA 400-4000 trip unit, UL listed.","salesMarkdown":"The ABB XT5NU340ABNF000XXX is a 3-pole molded case circuit breaker from the XT5N series, rated for 400 A continuous current at 690 VAC. It carries a TMA 400-4000 thermal-magnetic trip unit with adjustable overload and fixed instantaneous settings, suited for protecting feeders and large motor branch circuits in industrial switchboards. The 400 A rating at 690 VAC defines the breaker's continuous current capacity at its maximum rated voltage. For a 480 VAC panel, the same 400 A frame carries full ampacity without derating. The 3-pole configuration matches three-phase distribution; the TMA trip unit provides thermal protection for overloads and magnetic pickup for short circuits, with the 400-4000 range indicating the adjustable thermal element covers 400 A to 4000 A (the frame's upper limit). ## Panel integration The XT5N frame mounts in standard switchboard or panelboard cubicles with bolted connections. Line and load lugs accept copper or aluminum conductors sized for 400 A. The TMA trip unit's dials are accessible through the cover for field adjustment of the thermal pickup without removing the breaker.","metaTitle":"ABB XT5NU340ABNF000XXX Molded Case Breaker, 400 A, 690 VAC","metaDescription":"ABB XT5N 400 TMA 400-4000 3P FF UL molded case circuit breaker rated 400 A at 690 VAC. Current lifecycle stage. 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":{"Amps":"400","Type":"Breaker; Molded Case","Poles":"3","title":"XT5NU340ABNF000XXX","Volts AC":"690","description":"XT5N 400 TMA 400-4000 3P FF UL|XT5N 400 TMA 400-4000 3P FF UL","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b51c35e4996973cdc0d937706ac550de.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the continuous amp rating of XT5NU340ABNF000XXX?","answer":"It is rated 400 A continuous at 690 VAC, 3-pole."},{"question":"Where can I buy XT5NU340ABNF000XXX?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for current pricing and availability."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/XT5NU340ABNF000XXX","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/XT5NU340ABNF000XXX 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}}