{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203MUC-K40","brand":"ABB","brandSlug":"abb","productSlug":"S203MUC-K40","canonicalUrl":"https://aoctrl.com/abb/S203MUC-K40","factsUrl":"https://aoctrl.com/api/mcp/products/S203MUC-K40","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200MUC series, S203MUC-K40, 3-pole miniature circuit breaker, 40 A, Trip Curve K, 277 V AC / 500 V DC, 6 kA interrupting capacity, DIN-rail mount.","salesMarkdown":"Curve K tolerates motor inrush without nuisance tripping. Rated 277 V AC and 500 V DC, with an interrupting capacity of 6 kA at AC and 10 kA at DC. The DC rating is notably higher than the AC — useful for DC bus or battery-backed circuits where fault currents can be lower but sustained. The 6 kA AC interrupting rating covers standard commercial and light industrial panelboard fault levels; verify it against your available fault current before specifying. The 3-pole form factor occupies three modular units of DIN space (each 17.5 mm wide), so factor that into your panel fill. The S200MUC series uses a clip-on mechanism — press onto the rail, engage the bottom latch, and it locks in. No tools needed for installation; removal requires a flat-blade screwdriver to release the latch.","metaTitle":"ABB S203MUC-K40 MCB, 3P K 40A, DIN Rail","metaDescription":"ABB S203MUC-K40 miniature circuit breaker, 40A, 3-pole, Trip Curve K, 277 VAC / 500 VDC, 6 kA interrupting. Sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Amps":"40","Type":"Trip Curve K","Poles":"3","title":"S203MUC-K40","Mounting":"DIN Rail","Volts AC":"277","Volts DC":"500","description":"ABB S203MUC-K40 MCB S200MUC 3P K 40|ABB S203MUCK40 MCB S200MUC 3P","lifecycle_stage":"current","Interrupt Rating AC":"6 kA","Interrupt Rating DC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0373edfc36eb58e2c802636977063e08.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203MUC-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/S203MUC-K40 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}}