{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S803S-K63","brand":"ABB","brandSlug":"abb","productSlug":"S803S-K63","canonicalUrl":"https://aoctrl.com/abb/S803S-K63","factsUrl":"https://aoctrl.com/api/mcp/products/S803S-K63","rawCanonicalId":null},"summary":{"shortDescription":"ABB S803S-K63, miniature circuit breaker, 63 A, 3-pole, trip curve K, DIN-rail mount, 50 kA interrupting capacity at 230 VAC.","salesMarkdown":"Its 50 kA interrupting capacity at 230 VAC gives headroom for high-fault-current installations, common in industrial switchgear where upstream transformer ratings push available fault current above 25 kA. The K-curve (10–14× In magnetic trip) is the key selector: it handles the inrush of motor loads, transformers, and inductive circuits without nuisance tripping, while still providing short-circuit protection. At 63 A continuous, it backs a moderate motor feeder or a sub-distribution board. ## Panel integration Snap-on DIN-rail mount (standard 35 mm rail) fits into any enclosure or sub-panel. The 3-pole width occupies three modular units; plan for side-by-side grouping with other S800-series breakers for a clean bus-bar layout.","metaTitle":"ABB S803S-K63 63A 3P K-Curve MCB, 50 kA","metaDescription":"ABB S803S-K63 63 A, 3-pole, K-curve miniature circuit breaker. 50 kA interrupting capacity at 230 VAC. DIN-rail mount, current lifecycle. Quoted to order.","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":"230","lifecycle_stage":"current","Interrupt Rating AC":"50 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1d81743144a9c5d7707702e158b9e427.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S803S-K63/alternatives.json"},"ai":{"faq":[{"question":"What is the interrupting rating of the S803S-K63?","answer":"The S803S-K63 has a 50 kA interrupting capacity at 230 VAC, giving it headroom for high-fault-current industrial panels."},{"question":"Where can I buy the S803S-K63 and how is it quoted?","answer":"The S803S-K63 is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What does the K-curve mean on this breaker?","answer":"The K-curve (magnetic trip at 10–14× rated current) is designed for motor and transformer loads, handling inrush without nuisance tripping while still providing short-circuit protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S803S-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/S803S-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}}