{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203P-C20","brand":"ABB","brandSlug":"abb","productSlug":"S203P-C20","canonicalUrl":"https://aoctrl.com/abb/S203P-C20","factsUrl":"https://aoctrl.com/api/mcp/products/S203P-C20","rawCanonicalId":null},"summary":{"shortDescription":"ABB S203P-C20, 3-pole miniature circuit breaker, 20 A, Trip Curve C, 277 VAC, 10 kA interrupting capacity, DIN rail mount.","salesMarkdown":"## What this MCB is and where it fits The ABB S203P-C20 is a 3-pole miniature circuit breaker rated 20 A with Trip Curve C, interrupting 10 kA at 277 VAC. It snaps onto a DIN rail inside a distribution board or control panel, protecting branch circuits against overload and short-circuit faults. The C-curve characteristic means it trips between 5× and 10× rated current — the standard choice for moderate inrush loads like small motors, transformers, and lighting banks where a B-curve would nuisance-trip on startup. ## Ratings and what they mean for coordination The 20 A rating sets the continuous load limit — size the upstream conductor and any downstream load for no more than 20 A continuous. The 10 kA interrupting capacity at 277 VAC tells you this breaker can safely clear a fault current up to that level without welding contacts or rupturing the case. In a panel with an available fault current below 10 kA, it coordinates cleanly; above that, you need a current-limiting upstream device or a higher-rated breaker. The 277 VAC rating matches North American 480Y/277 V wye systems — the breaker protects line-to-neutral loads on a 277 V leg. ## Panel integration note DIN-rail mount: clips onto standard 35 mm DIN rail in any enclosure. Three-pole form factor occupies 3 module widths (approx 54 mm). No special busbar or comb needed for the line side — standard pin busbars fit the tunnel terminals. Wire range typically 1–25 mm² solid or stranded; torque to the value printed on the breaker face.","metaTitle":"ABB S203P-C20 MCB, 3P C 20A, 10 kA","metaDescription":"ABB S203P-C20 miniature circuit breaker, 3-pole, 20 A, Trip Curve C, 10 kA interrupting capacity at 277 VAC. DIN rail mount. Current lifecycle stage. Quoted to order.","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":"S203P-C20","Mounting":"DIN Rail","Volts AC":"277","description":"ABB S203P-C20 MCB 3P C 20A 480Y/277|ABB S203PC20 MCB 3P C 20A 480","lifecycle_stage":"current","Interrupt Rating AC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$39.37","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1bb1059ca4edd385b815eac7ee5bda93.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is S203P-C20's interrupting rating?","answer":"10 kA at 277 VAC — sufficient for most commercial and light industrial panels with available fault current below that level."},{"question":"Will S203P-C20 drop into a panel specified around S203-D13?","answer":"Yes — both are 3-pole, DIN-rail-mounted ABB S200-series breakers with the same footprint and terminal layout. The only difference is the trip curve: S203P-C20 is Curve C (5–10× In), while S203-D13 is Curve D (10–20× In). No rewiring needed; just verify the curve matches the load's inrush profile."},{"question":"Where can I buy S203P-C20 and how is it quoted?","answer":"Sourced and quoted to order through independent distribution channels. Submit an RFQ for current availability and pricing — confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203P-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/S203P-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}}