{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"XT5NU340AEFF000XXX","brand":"ABB","brandSlug":"abb","productSlug":"XT5NU340AEFF000XXX","canonicalUrl":"https://aoctrl.com/abb/XT5NU340AEFF000XXX","factsUrl":"https://aoctrl.com/api/mcp/products/XT5NU340AEFF000XXX","rawCanonicalId":null},"summary":{"shortDescription":"ABB, XT5N Series, Molded Case Circuit Breaker, XT5NU340AEFF000XXX, 400 A, 600 V AC/DC, 3-Pole, Ekip Dip LS/I, UL/CSA.","salesMarkdown":"## 400 A Molded Case Breaker with Ekip Dip LS/I Protection The ABB XT5NU340AEFF000XXX is a 400 A, 3-pole molded case circuit breaker (MCCB) from the XT5N frame, rated for 600 V AC and 600 V DC. It carries the Ekip Dip LS/I electronic trip unit, which gives you adjustable long-time (L) and short-time (S) pickup and delay, plus fixed instantaneous (I) protection. The 400 A frame is sized for main feeder or large motor branch protection where you need selectivity downstream. For a commissioning engineer verifying the protection scheme: the LS/I curve means you can coordinate the breaker with downstream devices by setting the S delay — a common requirement on a panel fed by a transformer or generator. The 600 V DC rating covers battery banks or UPS outputs, though verify the DC polarity marking on the terminals before energizing. ## Duty and Deployment Context The XT5N frame mounts in a standard switchboard or panel enclosure on a bolted bus connection — no DIN-rail adapter for this frame class. The 400 A continuous rating and 600 V AC/DC withstand let it serve as a main disconnect on a 600 V distribution panel. For a field-service tech isolating a fault: the breaker's rotary handle mechanism provides visible indication of the contact position. The Ekip Dip unit stores the last-trip cause (L, S, or I) on the LCD, which cuts down troubleshooting time on a downstream short or overload event.","metaTitle":"ABB XT5NU340AEFF000XXX XT5N 400A MCCB, 600V AC/DC, Ekip Dip","metaDescription":"ABB XT5NU340AEFF000XXX molded case circuit breaker, 400 A, 600 V AC/DC, 3-pole with Ekip Dip LS/I trip unit. UL/CSA listed, current lifecycle. 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":"XT5NU340AEFF000XXX","Volts AC":"600","Volts DC":"600","description":"Breaker, Molded Case, XT5N, 400A, 600V AC/DC, Ekip Dip LS/I,|Breaker, Molded Case, XT5N, 400 Amp, 600 Volt AC/DC, Ekip Dip LS/I, 3-Pole, FF, UL/CSA","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/97d1f943d727ad2fa83706ba7d2c71b6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the key ratings of the XT5NU340AEFF000XXX?","answer":"It is a 400 A, 3-pole molded case breaker rated for 600 V AC and 600 V DC, with an Ekip Dip LS/I electronic trip unit. The UL and CSA listings cover North American installations."},{"question":"Where can I buy the XT5NU340AEFF000XXX?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of your quote request — contact our desk with your quantity and target delivery window."},{"question":"What does the Ekip Dip LS/I trip unit provide?","answer":"The LS/I designation means adjustable long-time (L) and short-time (S) protection with fixed instantaneous (I) pickup. The S delay setting allows selective coordination with downstream breakers, which is essential for maintaining power to healthy circuits during a fault."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/XT5NU340AEFF000XXX","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/XT5NU340AEFF000XXX 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}}