{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203P-Z20","brand":"ABB","brandSlug":"abb","productSlug":"S203P-Z20","canonicalUrl":"https://aoctrl.com/abb/S203P-Z20","factsUrl":"https://aoctrl.com/api/mcp/products/S203P-Z20","rawCanonicalId":null},"summary":{"shortDescription":"ABB S203P-Z20 miniature circuit breaker, 3-pole, Trip Curve Z, 20 A, 277 VAC, 10 kA interrupting rating, DIN rail mount.","salesMarkdown":"The 20 A continuous rating sets the maximum load it carries without tripping under normal conditions — size your downstream wiring and load to stay comfortably below this. Trip Curve Z means it trips within 2 to 3 times rated current on a short circuit, faster than a B or C curve, which suits semiconductor or sensitive electronic loads where even a brief overcurrent can damage components. ## Deployment context Snaps onto standard DIN rail inside a panel enclosure. The 3-pole configuration covers three-phase circuits or three independent single-phase legs ganged together. Rated 277 VAC phase-to-neutral (480Y/277 VAC system), so it fits common North American commercial and light industrial panelboards. The Trip Curve Z characteristic makes it a natural choice for protecting control transformers, PLC power supplies, or DC rectifier outputs where you need fast clearing without nuisance trips from inrush.","metaTitle":"ABB S203P-Z20 MCB 3P Z 20A 277VAC DIN Rail","metaDescription":"ABB S203P-Z20 miniature circuit breaker, 3-pole, Trip Curve Z, 20 A, 277 VAC, 10 kA interrupting rating. DIN rail mount. Current production. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Amps":"20","Type":"Trip Curve Z","Poles":"3","Mounting":"DIN Rail","Volts AC":"277","lifecycle_stage":"current","Interrupt Rating AC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/575b8fb4a385ef216d42146f2fdb0c7d.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S203P-Z20/alternatives.json"},"ai":{"faq":[{"question":"What is the interrupting rating of the S203P-Z20?","answer":"The S203P-Z20 carries a 10 kA interrupting rating at 277 VAC, which means it can safely clear a fault up to 10,000 amps without failing."},{"question":"Where can I buy the S203P-Z20?","answer":"The S203P-Z20 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What does Trip Curve Z mean on the S203P-Z20?","answer":"Trip Curve Z means the breaker trips at 2 to 3 times its rated current (40 to 60 A for a 20 A breaker), providing fast overcurrent protection for sensitive electronic loads like power supplies and control circuits."},{"question":"Will the S203P-Z20 fit a panel designed for the S204-B32?","answer":"No, the S204-B32 is a 4-pole, 32 A, Curve B breaker. The S203P-Z20 is 3-pole, 20 A, Curve Z. They share the same DIN-rail footprint and voltage rating, but the pole count, current rating, and trip curve differ — the panel wiring and load sizing must match the S203P-Z20's ratings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203P-Z20","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-Z20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}