{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S803S-KM50","brand":"ABB","brandSlug":"abb","productSlug":"S803S-KM50","canonicalUrl":"https://aoctrl.com/abb/S803S-KM50","factsUrl":"https://aoctrl.com/api/mcp/products/S803S-KM50","rawCanonicalId":null},"summary":{"shortDescription":"ABB S803S-KM50, S800S series, 3-pole miniature circuit breaker, 50 A, Trip Curve K, 230 VAC, 50 kA interrupting capacity, DIN rail mount.","salesMarkdown":"That level of SCCR (short-circuit current rating) is typical for industrial panelboards and motor control centers where the available fault current from the upstream transformer is high — it avoids cascading failure downstream and keeps arc-flash energy contained within the breaker's tested limits. ## Deployment context The 3-pole form factor occupies three module widths — plan your DIN rail layout accordingly, leaving finger-duct clearance for the outgoing cable terminations. The S800S series uses tunnel terminals accepting up to 35 mm² conductor, so torque the terminals to the value printed on the device face (typically 3.5 Nm) to avoid loose connections that generate heat.","metaTitle":"ABB S803S-KM50 MCB, 50A 3P Curve K, 50kA","metaDescription":"ABB S803S-KM50 S800S series MCB, 50 A, 3-pole, Trip Curve K, 50 kA interrupting capacity at 230 VAC. DIN rail mount. Current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Amps":"50","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/823877d99c7f6ef16fc73a042317b216.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S803S-KM50/alternatives.json"},"ai":{"faq":[{"question":"What is S803S-KM50's interrupting capacity?","answer":"The interrupting rating is 50 kA at 230 VAC, which means it can safely clear fault currents up to 50,000 A without damage to the breaker or the panel."},{"question":"What load types is Trip Curve K designed for?","answer":"Curve K (magnetic trip at 8–12× In) is engineered for motor circuits, transformers, and inductive loads where the starting inrush current is several times the running current. It avoids nuisance tripping on start-up while still providing short-circuit protection."},{"question":"Where can I buy S803S-KM50 and get current pricing?","answer":"The S803S-KM50 is sourced 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."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S803S-KM50","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-KM50 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}}