{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S273-K63","brand":"ABB","brandSlug":"abb","productSlug":"S273-K63","canonicalUrl":"https://aoctrl.com/abb/S273-K63","factsUrl":"https://aoctrl.com/api/mcp/products/S273-K63","rawCanonicalId":null},"summary":{"shortDescription":"ABB S273-K63 miniature circuit breaker, 3-pole, 63 A, Trip Curve K, DIN rail mount.","salesMarkdown":"Curve K means the magnetic trip operates between 8 and 12 times rated current (504–756 A), designed for inductive loads like motors and transformers where inrush is brief but high; it avoids nuisance trips that a B-curve or C-curve would cause on those starts. The 3-pole block occupies three modular-width positions (about 52.5 mm total). Wire termination accepts conductors up to 25 mm², which matches the 63 A rating for a motor branch circuit or transformer primary protection. I'd land the line and load conductors with ring lugs and torque to the terminal marking; the spring-cage variant (if present) wants ferruled stranded for a clean pull.","metaTitle":"S273-K63 63A 3-Pole Trip Curve K MCB, DIN Rail","metaDescription":"S273-K63 miniature circuit breaker, 63 A, Trip Curve K, 3-pole, DIN rail mount. Current-production status. Sourced to order. Get a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Amps":"63","Type":"Trip Curve K","Poles":"3","Mounting":"DIN Rail","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$40.03","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S273-K63/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy S273-K63 and how do I get a price?","answer":"S273-K63 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 is the closest functional second-source for S273-K63?","answer":"The S203-K63 is the official successor — same 63 A, 3-pole, Curve K, DIN-rail footprint. It drops into the same panel position without rewiring."},{"question":"What does Trip Curve K mean on this breaker?","answer":"Trip Curve K means the magnetic short-circuit trip activates between 8x and 12x rated current (504–756 A for the 63 A model). That characteristic suits motor and transformer branch circuits where brief inrush is higher than a C-curve would tolerate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S273-K63","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/S273-K63 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}}