{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203P-Z25","brand":"ABB","brandSlug":"abb","productSlug":"S203P-Z25","canonicalUrl":"https://aoctrl.com/abb/S203P-Z25","factsUrl":"https://aoctrl.com/api/mcp/products/S203P-Z25","rawCanonicalId":null},"summary":{"shortDescription":"ABB S203P-Z25, 3-pole miniature circuit breaker, 25 A, Trip Curve Z, 277 VAC, 10 kA interrupting rating, DIN rail mount.","salesMarkdown":"The 10 kA interrupting capacity at 277 VAC handles fault currents typical of commercial and light industrial branch circuits. Curve Z trips between 2× and 3× rated current, making it the correct choice for semiconductor and sensitive electronic load protection where standard B or C curves would nuisance-trip on inrush. ## What Curve Z means for fit Trip Curve Z is the tightest standard magnetic trip band — it clears faults at 2× to 3× In (50–75 A for this 25 A unit). That catches short-circuit faults fast enough to protect power supplies, rectifiers, and control transformers without the delayed reaction of a Curve C. If your BOM specifies Curve Z, a B- or C-curve breaker in the same rail slot will pass the same ampacity but may not clear a semiconductor fault before the device fails short. The 3-pole footprint occupies three modular units (17.5 mm per pole). Terminal capacity accepts up to 25 mm² conductor. No special busbar required for the 25 A rating — standard pin or fork busbars for the S200 series fit directly.","metaTitle":"S203P-Z25 Miniature Circuit Breaker, 25A, 3P, Curve Z, 10kA","metaDescription":"S203P-Z25 25A 3-pole miniature circuit breaker, Trip Curve Z, 277 VAC, 10 kA interrupting rating. DIN rail mount. 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":"25","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":"$53.34","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9e46d70fc983497977410d3e50acd24f.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S203P-Z25/alternatives.json"},"ai":{"faq":[{"question":"What is S203P-Z25's interrupting rating?","answer":"10 kA at 277 VAC. That is the maximum fault current the breaker can safely interrupt without welding contacts or rupturing the housing."},{"question":"Will S203P-Z25 drop into a panel specified around S203-D13?","answer":"Yes — same 3-pole DIN-rail footprint, same 277 VAC voltage rating, same 10 kA interrupting capacity. The only difference is the trip curve: Curve Z (2–3× In) versus Curve D (10–20× In). If the panel was designed for Curve D motor/inrush loads, dropping in a Curve Z breaker will nuisance-trip on transformer or motor inrush. Verify the load type before swapping."},{"question":"Where can I buy S203P-Z25?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time — submit an RFQ for a firm commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203P-Z25","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-Z25 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}}