{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203-K6","brand":"ABB","brandSlug":"abb","productSlug":"S203-K6","canonicalUrl":"https://aoctrl.com/abb/S203-K6","factsUrl":"https://aoctrl.com/api/mcp/products/S203-K6","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200 Series, S203-K6, 3-pole miniature circuit breaker, 6 A, Trip Curve K, 480Y/277 V AC, 6 kA interrupting capacity, UL 1077 supplemental protector.","salesMarkdown":"The K-curve trips magnetically between 8 and 12 times rated current — designed for inductive loads like motors and transformers where inrush current exceeds a C-curve's tolerance but doesn't need the high-end delay of a D-curve. At 6 A, it protects a 3-phase motor drawing roughly 2.2 kW at 480 V, sized for the branch circuit rather than the main feeder. Rated 480Y/277 V AC with a 6 kA interrupting capacity, this breaker clears phase-to-phase and phase-to-neutral faults up to 6 kA without welding its contacts. Classified as a UL 1077 supplemental protector — not a branch-circuit rated UL 489 breaker. That means it's intended for internal panel protection of control circuits, HVAC equipment, or machine-tool sub-circuits where the upstream branch breaker already provides the service entrance protection. CSA 22.2 listed for Canadian installations. Three-pole width occupies 54 mm (3 x 18 mm per pole) of rail space — plan the enclosure fill factor accordingly. The S200 series uses a tunnel-style screw terminal accepting 0.5 to 25 mm² (AWG 20–4) copper wire; torque to 2.5 Nm per the terminal marking.","metaTitle":"ABB S203-K6 6A 3-Pole K-Curve MCB, 480Y/277V, 6 kAIC, UL 107","metaDescription":"ABB S203-K6 6A 3-pole miniature circuit breaker, K-curve, 480Y/277V AC, 6 kAIC, UL 1077 supplemental protector. Current lifecycle stage. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Amps":"6","Type":"Trip Curve K","Poles":"3","title":"S203-K6","Mounting":"DIN Rail","Volts AC":"480","description":"6A, 480Y/277V, 6 kAIC, B-Curve, UL 1077 CB|Miniature Circuit Breaker, 6 Amps, 480Y/277V AC. K - Curve. 6 kAIC. S200 Series. Supplemental Protectors. UL 1077, CSA 22.2.","lifecycle_stage":"current","Interrupt Rating AC":"6 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$22.23","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1b888e9d473400bd32917551d1de57a0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source to S203-K6?","answer":"The S203-C10 shares the same 3-pole DIN-rail form factor but differs in rating: 10 A versus 6 A, and a C-curve (5–10x In) versus the K-curve (8–12x In). It will not drop into a panel specified for S203-K6 without verifying the load current and trip coordination — the higher amp rating and different curve may not provide the same protection."},{"question":"What compliance documentation does ABB provide for S203-K6?","answer":"The S203-K6 carries UL 1077 and CSA 22.2 certifications. ABB typically provides RoHS and REACH declarations on request through the supply chain; these are confirmed at the time of order."},{"question":"Where can I buy S203-K6?","answer":"The S203-K6 is sourced and quoted to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203-K6","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-K6 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}