{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S803S-K50","brand":"ABB","brandSlug":"abb","productSlug":"S803S-K50","canonicalUrl":"https://aoctrl.com/abb/S803S-K50","factsUrl":"https://aoctrl.com/api/mcp/products/S803S-K50","rawCanonicalId":null},"summary":{"shortDescription":"ABB S803S-K50 miniature circuit breaker, 50 A, 3-pole, Trip Curve K, 50 kA interrupting capacity, DIN rail mount.","salesMarkdown":"The DIN rail mounting means it clips directly onto a standard 35 mm rail in the enclosure — no panel drilling, no adapter brackets. That's the standard for modern distribution boards and control panels across Europe and much of Asia. Rated for 400/690 VAC and 375 VDC, this 3-pole breaker handles three-phase motor circuits, lighting distribution, and general branch protection in industrial control panels. The thermal-magnetic trip mechanism gives you thermal overload protection via a bimetal strip and instantaneous short-circuit protection via a solenoid — no electronic trip unit to fail or need configuration. At 50 A and Curve K, it's a natural fit for a 15–30 kW motor feeder (depending on voltage and duty) where the inrush can hit 8–12× FLA for a few cycles. Curve K's magnetic trip threshold (typically 8–12× In) holds through that inrush without tripping, then clears a hard fault fast.","metaTitle":"S803S-K50 50A 3-Pole Trip Curve K MCB, 50 kA Interrupting","metaDescription":"S803S-K50 50A 3-pole MCB with Trip Curve K, 50 kA interrupting capacity at 400/690 VAC. DIN rail mount, current lifecycle stage. 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/87176e6f84539903c3bf8eb182c7d845.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S803S-K50/alternatives.json"},"ai":{"faq":[{"question":"What is S803S-K50's interrupting rating?","answer":"The S803S-K50 carries a 50 kA interrupting rating at 400/690 VAC. That means it can safely interrupt a short-circuit fault up to 50,000 amps without catastrophic failure, which is essential for panel SCCR compliance under IEC 60947-2."},{"question":"What does Trip Curve K mean for this breaker?","answer":"Trip Curve K on the S803S-K50 means the magnetic trip threshold is set at 8–12 times the rated current. This suits motor and transformer loads where startup inrush would nuisance-trip a B or C curve breaker. The thermal trip element handles sustained overloads."},{"question":"Where can I buy S803S-K50 and how is it quoted?","answer":"We source the S803S-K50 to order against an RFQ through independent industrial distribution. Availability and current pricing are confirmed at quote time — no automated stock figure, no lead-time promise on the listing. Submit an RFQ for a firm delivery commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S803S-K50","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-K50 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}}