{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"XT4LU3030AFF00NXXX","brand":"ABB","brandSlug":"abb","productSlug":"XT4LU3030AFF00NXXX","canonicalUrl":"https://aoctrl.com/abb/XT4LU3030AFF00NXXX","factsUrl":"https://aoctrl.com/api/mcp/products/XT4LU3030AFF00NXXX","rawCanonicalId":null},"summary":{"shortDescription":"ABB XT4L series molded case circuit breaker, 250 A frame, TMF 30-400 A thermal-magnetic adjustable trip, 3-pole, fixed thermal, fixed magnetic, UL/CSA certified, order code XT4LU3030AFF00NXXX.","salesMarkdown":"This is a 3-pole unit with fixed thermal and fixed magnetic settings, UL/CSA listed — meaning it meets North American panelboard and switchboard standards for branch circuit protection. ## What the description tells a panel builder The description decodes as: XT4L series, 250 A frame, TMF trip block adjustable from 30 A to 400 A, 3-pole, fixed thermal and fixed magnetic settings, UL/CSA certified. The TMF trip provides thermal-magnetic overload and short-circuit protection with a fixed magnetic pickup — no field-adjustable instantaneous setting. This is a panel-mount device, sized for standard MCC or distribution panel cutouts; verify mounting pattern against the existing bus or lug kit. ## What the trip rating means for the circuit The TMF 30-400 A thermal-magnetic trip allows the continuous current rating to be set anywhere between 30 A and 400 A via the thermal adjustment dial, while the magnetic (short-circuit) pickup is fixed relative to the selected thermal setting. This gives the specifying engineer flexibility to match the breaker to a specific load without changing the trip unit — useful when the same frame size is used across multiple motor or feeder circuits in a panel.","metaTitle":"ABB XT4LU3030AFF00NXXX XT4L 250A TMF 30-400A 3P F F UL/CSA","metaDescription":"ABB XT4LU3030AFF00NXXX XT4L molded case circuit breaker, 250 A frame, TMF 30-400 A trip, 3-pole, UL/CSA. 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":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/XT4LU3030AFF00NXXX/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy XT4LU3030AFF00NXXX and how is it quoted?","answer":"The XT4LU3030AFF00NXXX is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What does the description XT4L 250 TMF 30-400 3P F F UL/CSA mean?","answer":"It decodes as: ABB XT4L series molded case circuit breaker, 250 A frame size, TMF thermal-magnetic trip unit adjustable 30-400 A, 3-pole, fixed thermal (F) and fixed magnetic (F) settings, UL/CSA certified."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/XT4LU3030AFF00NXXX","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/XT4LU3030AFF00NXXX 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}}