{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203-K63","brand":"ABB","brandSlug":"abb","productSlug":"S203-K63","canonicalUrl":"https://aoctrl.com/abb/S203-K63","factsUrl":"https://aoctrl.com/api/mcp/products/S203-K63","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200 series, S203-K63, 3-pole miniature circuit breaker, 63 A, Trip Curve K, 480Y/277 VAC, 6 kA interrupting rating, DIN rail mount, UL 1077, CSA 22.2.","salesMarkdown":"## 63 A, Trip Curve K — what it means for your panel The S203-K63: That interrupting rating covers most industrial control-panel fault levels up to 6 kA symmetrical — if your panel SCCR is higher, you need an upstream current-limiting device or a higher-rated breaker. The thermal element handles the 63 A continuous; the magnetic element clears hard faults fast. ## UL 1077 supplemental protection — compliance boundary This breaker carries UL 1077 and CSA 22.2 listing — it is a supplemental protector, not a branch-circuit rated device per UL 489. That means it is intended for use within equipment (control panels, HVAC units, machine-tool enclosures) where a UL 489 breaker already provides branch-circuit protection upstream. The 480Y/277 VAC rating covers common 277/480 V wye panels.","metaTitle":"ABB S203-K63 3-Pole MCB, 63 A, Trip Curve K, DIN Rail","metaDescription":"ABB S203-K63 miniature circuit breaker, 63 A, 3-pole, Trip Curve K, 480Y/277 VAC, 6 kA interrupting rating, UL 1077. Quoted to order against BOM.","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","Volts AC":"277","lifecycle_stage":"current","Interrupt Rating AC":"6 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$38.10","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1b888e9d473400bd32917551d1de57a0.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S203-K63/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does ABB provide for the S203-K63?","answer":"The S203-K63 is UL 1077 listed and CSA 22.2 certified per the manufacturer's description. ABB typically provides a Declaration of Conformity covering the relevant standards; RoHS and REACH compliance documentation is available from ABB's product compliance portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203-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/S203-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}}