{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203P-Z8","brand":"ABB","brandSlug":"abb","productSlug":"S203P-Z8","canonicalUrl":"https://aoctrl.com/abb/S203P-Z8","factsUrl":"https://aoctrl.com/api/mcp/products/S203P-Z8","rawCanonicalId":null},"summary":{"shortDescription":"ABB, S200 series, miniature circuit breaker MCB, 3-pole, Trip Curve Z, 8 A, 277 VAC, 10 kA interrupting rating, DIN rail mount.","salesMarkdown":"## 8 A, Curve Z — what it means for the panel The ABB S203P-Z8 is a 3-pole miniature circuit breaker rated 8 A with Trip Curve Z, interrupting 10 kA at 277 VAC. Curve Z trips between 2 and 3 times rated current, making it the tightest standard magnetic trip — it clears a short-circuit before the fault current climbs high enough to damage downstream solid-state electronics or sensitive control transformers. For a cold-storage or food-processing panel, that means the breaker acts before the surge reaches PLC power supplies or analog input cards. ## Drop-in fit vs. the 25 A sibling The S203-Z25 shares the same 3-pole DIN-rail footprint, 277 VAC rating, and 10 kA interrupting capacity. The only difference is the amp rating — 25 A instead of 8 A — and the magnetic trip threshold scales accordingly. If a panel was specified around the S203-Z25, the S203P-Z8 occupies the same physical space, same bus-bar pitch, same terminal layout. No rewiring needed at the mounting level; just confirm the load current and the Z-curve coordination downstream. ## Integration into the enclosure The 3-pole width is 3 x 17.5 mm = 52.5 mm — standard module spacing. Spring-cage terminals accept 0.5 to 25 mm² conductors. For a cold-chain panel running at sub-zero ambient, the thermal-magnetic mechanism is sealed against condensation; no derating needed down to -25 °C. The 10 kA SCCR at 277 VAC covers most industrial distribution panels fed from a 150 kVA or smaller transformer.","metaTitle":"ABB S203P-Z8 MCB, 3P, Curve Z, 8 A, 277 VAC, 10 kA","metaDescription":"ABB S203P-Z8 miniature circuit breaker, 3-pole, Trip Curve Z, 8 A, 277 VAC, 10 kA interrupting rating. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Amps":"8","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/640e90b319de6e6ceb9c810a64f42409.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S203P-Z8/alternatives.json"},"ai":{"faq":[{"question":"What is the interrupting rating of S203P-Z8?","answer":"The S203P-Z8 has a 10 kA interrupting rating at 277 VAC, which covers fault currents from most industrial distribution panels."},{"question":"Will S203P-Z8 drop into a panel specified for S203-Z25?","answer":"Yes, the S203P-Z8 shares the same 3-pole DIN-rail footprint, 277 VAC rating, and 10 kA interrupting capacity as the S203-Z25. The only difference is the 8 A rating vs. 25 A. No rewiring needed at the mounting level."},{"question":"Where can I buy S203P-Z8 and get current pricing?","answer":"The S203P-Z8 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203P-Z8","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-Z8 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}}