{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S803S-K40","brand":"ABB","brandSlug":"abb","productSlug":"S803S-K40","canonicalUrl":"https://aoctrl.com/abb/S803S-K40","factsUrl":"https://aoctrl.com/api/mcp/products/S803S-K40","rawCanonicalId":null},"summary":{"shortDescription":"ABB S803S-K40, 40 A, 3-pole, trip curve K miniature circuit breaker, 50 kA interrupting capacity at 230 V AC, DIN rail mount.","salesMarkdown":"## 40 A, Curve K, 50 kA — what this MCB is built for The K curve typically trips magnetically between 8 and 12 times rated current, which for a 40 A breaker means the magnetic release operates between 320 A and 480 A — a good match for motor branch circuits where the starting surge can hit 6–8× FLA without causing a trip. Snap-on DIN rail mounting per EN 60715 makes this breaker a direct fit for standard 35 mm top-hat rail in any enclosure or panel — no adapter plates or special brackets needed. Rated operational voltage covers 400/690 V AC three-phase systems and 375 V DC, so it handles both standard European low-voltage distribution and DC bus protection in drive-fed panels. The 3-pole configuration suits three-phase motor feeds, heater banks, or any balanced load where all phases need simultaneous overcurrent and short-circuit protection.","metaTitle":"S803S-K40 40A 3-Pole Trip Curve K MCB, 50 kA","metaDescription":"S803S-K40 miniature circuit breaker, 40 A, 3-pole, trip curve K, 50 kA interrupting capacity at 230 V AC. 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":"40","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/9cc1ee6cdaa93ee85766b0db357ae88d.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S803S-K40/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S803S-K40","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-K40 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}}