{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"XT2LU3125BBB000XXX","brand":"ABB","brandSlug":"abb","productSlug":"XT2LU3125BBB000XXX","canonicalUrl":"https://aoctrl.com/abb/XT2LU3125BBB000XXX","factsUrl":"https://aoctrl.com/api/mcp/products/XT2LU3125BBB000XXX","rawCanonicalId":null},"summary":{"shortDescription":"ABB XT2LU3125BBB000XXX, XT2L 125TMA, 3-pole molded case circuit breaker, current lifecycle stage.","salesMarkdown":"This is the core overcurrent protection device for a distribution panel or motor control center branch — the 3-pole configuration handles three-phase loads, and the TMA trip gives you adjustable thermal (overload) and fixed magnetic (short-circuit) protection curves. The lifecycle stage is current, meaning it remains in ABB's active catalog and is not subject to a last-time-buy window. The 3-pole design means it occupies three module widths — factor that into your panel fill calculation alongside the upstream feeder breaker and downstream load terminals. The TMA trip unit's thermal adjustment range lets you fine-tune the overload pickup to match motor or transformer inrush without nuisance tripping, while the fixed magnetic setting clears hard faults fast enough to maintain selectivity with downstream branch breakers. ## Comparison with XT5NU340ABNF000XXX The XT5NU340ABNF000XXX is a physically larger XT5 frame breaker rated 400 A at 690 V AC, also 3-pole. It will not drop into a panel cutout or DIN-rail footprint designed for the XT2L frame — the XT5 requires wider spacing and higher bus-bar ampacity. If your BOM originally specified the XT5NU340ABNF000XXX, the XT2LU3125BBB000XXX is not a form-fit replacement; the two serve different current tiers (125 A vs 400 A) and different frame sizes. The XT2LU3125BBB000XXX is the correct choice for a 125 A branch; the XT5NU340ABNF000XXX belongs at the feeder or main level.","metaTitle":"ABB XT2LU3125BBB000XXX XT2L 125TMA, 3-Pole Molded Case Circu","metaDescription":"ABB XT2LU3125BBB000XXX 3-pole molded case circuit breaker, current lifecycle stage. Sourced to order against RFQ. Get a quote for your BOM line.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Poles":"3","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/XT2LU3125BBB000XXX/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy XT2LU3125BBB000XXX and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ to confirm availability and current pricing for your quantity and delivery timeline."},{"question":"What is XT2LU3125BBB000XXX's listed poles (3) on this component line?","answer":"The XT2LU3125BBB000XXX is a 3-pole molded case circuit breaker, designed for three-phase overcurrent protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/XT2LU3125BBB000XXX","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/XT2LU3125BBB000XXX when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}