{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MS450-40","brand":"ABB","brandSlug":"abb","productSlug":"MS450-40","canonicalUrl":"https://aoctrl.com/abb/MS450-40","factsUrl":"https://aoctrl.com/api/mcp/products/MS450-40","rawCanonicalId":null},"summary":{"shortDescription":"ABB MS450-40 manual motor protector, 40 A, 3-phase, adjustable FLA range 28-40 A, UL508, Trip Class 10/20, DIN rail.","salesMarkdown":"The MS450-40 is a manual motor protector rated 40 A, with an adjustable full-load amp (FLA) setting range of 28 to 40 A. That adjustability is the key spec: you set the dial to match the motor nameplate FLA, and the device provides both overload protection and short-circuit protection in one package — no separate contactor or fuse block needed for the branch circuit. UL508 listing means this unit is accepted for US industrial control panels without additional agency review. The dual Trip Class 10/20 gives you a choice: Class 10 for standard motor starting (faster trip on overload, better protection for the motor winding) or Class 20 for high-inertia loads like fans and flywheels that need a longer acceleration window before the overload trips. ## Built-in phase failure detection — why it matters for three-phase motors Phase failure detection is integrated into the MS450-40. If one phase drops out, the protector trips on the remaining single-phase current — which can be 1.73× the rated current and will overheat the motor winding in seconds.","metaTitle":"ABB MS450-40 Manual Motor Protector, 40 A, 28-40 A Range","metaDescription":"ABB MS450-40 manual motor protector, 40 A, adjustable 28-40 A FLA, 3-phase, UL508, Trip Class 10/20. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Amps":"40","Type":"Manual Motor Protector","Phase":"3","title":"MS450-40","Amps Range":"28 - 40","description":"28.00 - 40.00 FLA. MMP, MS450|28.00 - 40.00 FLA (Full Load Amps). MMP, 600V Rated, UL508, Trip Class: 10/20. Type MS450. Includes: Short Circuit Protection and Phase Failure Detection.","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1a9242ef3fe89548fb28ee05a51ecde8.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the adjustable FLA range on the MS450-40?","answer":"The MS450-40 has an adjustable full-load amp range of 28 to 40 A. You set the dial to match the motor nameplate FLA within that window."},{"question":"Does the MS450-40 include phase failure protection?","answer":"Yes, phase failure detection is built in. The protector will trip if one phase is lost, preventing single-phase motor damage."},{"question":"What compliance documentation does ABB provide for the MS450-40?","answer":"The MS450-40 is UL508 listed. ABB typically provides a Declaration of Conformity covering the applicable standards; specific RoHS and REACH declarations are available on request at RFQ time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/MS450-40","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/MS450-40 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}}