{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203-C4","brand":"ABB","brandSlug":"abb","productSlug":"S203-C4","canonicalUrl":"https://aoctrl.com/abb/S203-C4","factsUrl":"https://aoctrl.com/api/mcp/products/S203-C4","rawCanonicalId":null},"summary":{"shortDescription":"ABB S203-C4 miniature circuit breaker, 3-pole, 4 A, Trip Curve C, 277 VAC, 10 kA interrupting capacity, DIN-rail mount.","salesMarkdown":"## 3-pole, 4 A, Curve C — panel fit and trip coordination The S203-C4 is a 3-pole miniature circuit breaker rated at 4 A with a Trip Curve C characteristic, meaning the magnetic trip threshold sits at 5 to 10 times rated current — the standard choice for moderate inrush loads like motor starters, contactor coils, and general-purpose branch circuits where you need to ride through the starting surge without nuisance tripping. Snaps onto standard DIN rail for panel integration; the 3-pole block handles three-phase loads or three independent single-phase circuits with a common trip bar. ## Drop-in compatibility with the S203-C8 The S203-C8 is the same physical breaker — same 3-pole DIN-rail footprint, same 277 VAC rating, same 10 kA interrupting capacity — but rated at 8 A instead of 4 A. If a panel was built around the S203-C8, the C4 drops into the same mounting location without rewiring; the only change is the lower current rating, which reduces the load capacity of that branch.","metaTitle":"S203-C4 Miniature Circuit Breaker, 3 Pole, 4 A, Curve C","metaDescription":"S203-C4 miniature circuit breaker, 3-pole, 4 A, Trip Curve C, 10 kA interrupting at 277 VAC. DIN-rail mount. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Amps":"4","Type":"Trip Curve C","Poles":"3","title":"S203-C4","Mounting":"DIN Rail","Volts AC":"277","description":"Miniature Circuit Breaker, 3P, 4A|Miniature Circuit Breaker, 3 Pole, 4 Amp","lifecycle_stage":"current","Interrupt Rating AC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$16.46","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0281f0642eec9af339af926300b00533.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203-C4","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-C4 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}}