{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203M-C20","brand":"ABB","brandSlug":"abb","productSlug":"S203M-C20","canonicalUrl":"https://aoctrl.com/abb/S203M-C20","factsUrl":"https://aoctrl.com/api/mcp/products/S203M-C20","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200M series, S203M-C20, 3-pole miniature circuit breaker, 20 A, Trip Curve C, DIN rail mount, 277 VAC / 125 VDC, 6 kA interrupting capacity.","salesMarkdown":"## S203M-C20 — 20 A Curve C MCB for Branch Circuit Protection It mounts on DIN rail and provides overcurrent and short-circuit protection for branch circuits in panelboards, sub-distribution boards, and control panels. At 20 A, that means magnetic trip between 100 A and 200 A, clearing fast enough to protect downstream wiring without nuisance tripping on normal startup. Interrupting capacity is 6 kA at 277 VAC and 10 kA at 125 VDC. ## Peer Comparison — S203M-C50 The closest functional sibling is the S203M-C50, which shares the same 3-pole DIN rail form factor, Trip Curve C, and interrupting ratings (6 kA AC / 10 kA DC) but at 50 A. The S203M-C20 drops into the same panel footprint and wiring scheme — no rework needed if the panel was laid out for the C50. The only difference is the thermal-magnetic trip threshold, so the choice is purely load-current driven. ## Integration — DIN Rail Panel Fit Snap-on DIN rail mount, standard 35 mm profile. Three-pole width occupies 3 modular units (17.5 mm per pole). Spring-cage terminals accept 0.2–25 mm² copper — solid or ferruled stranded. Torque to 2.5 Nm per terminal.","metaTitle":"ABB S203M-C20 S200M MCB, 20 A, Curve C, 3-Pole","metaDescription":"ABB S203M-C20 S200M miniature circuit breaker, 20 A, Trip Curve C, 3-pole, DIN rail mount. 6 kA interrupting at 277 VAC, 10 kA at 125 VDC. Current production. Sourced to order agai","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Amps":"20","Type":"Trip Curve C","Poles":"3","title":"S203M-C20","Mounting":"DIN Rail","Volts AC":"277","Volts DC":"125","description":"ABB S203M-C20 S200M MCB 230V 3 POLE|ABB S203MC20 S200M MCB 230V 3","lifecycle_stage":"current","Interrupt Rating AC":"6 kA","Interrupt Rating DC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$33.02","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0f394850707782d98c7701dbcd6bd4d0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the key ratings for the S203M-C20?","answer":"20 A, Trip Curve C, 3-pole, 277 VAC / 125 VDC, 6 kA interrupting at 277 VAC and 10 kA at 125 VDC. DIN rail mount."},{"question":"Where can I buy the S203M-C20?","answer":"Sourced to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time — submit an RFQ for a firm quote."},{"question":"Will the S203M-C20 drop into a panel designed for the S203M-C50?","answer":"Yes — same 3-pole DIN rail footprint, same terminal layout, same interrupting ratings. The only difference is the 20 A vs 50 A thermal-magnetic trip setting, so no rewiring or panel modification is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203M-C20","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/S203M-C20 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}}