{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203P-Z40","brand":"ABB","brandSlug":"abb","productSlug":"S203P-Z40","canonicalUrl":"https://aoctrl.com/abb/S203P-Z40","factsUrl":"https://aoctrl.com/api/mcp/products/S203P-Z40","rawCanonicalId":null},"summary":{"shortDescription":"ABB S203P-Z40, 3-pole miniature circuit breaker, 40 A, Trip Curve Z, 277 VAC, 10 kA interrupting rating, DIN rail mount.","salesMarkdown":"Curve Z is the tightest standard trip curve, tripping between 2 and 3 times rated current (80–120 A for this unit), which makes it the right choice for protecting semiconductor circuits, PLC power supplies, and other sensitive electronic loads where a standard C-curve would let through too much energy before opening. Three poles means it switches all phases simultaneously — required for three-phase sub-feeds or motor branch circuits where you need full disconnection. The 277 VAC phase-to-neutral rating matches 480Y/277 V wye systems, so it's a direct fit for North American commercial panels fed from a 480/277 V transformer.","metaTitle":"ABB S203P-Z40 MCB, 3P, 40A, Curve Z, 10kA, DIN Rail","metaDescription":"ABB S203P-Z40 3-pole MCB, 40 A, Trip Curve Z, 277 VAC, 10 kA interrupting rating. Current production. 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":"40","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":"$59.69","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d0dc44748f71bc6d95ce8318f3bedb3f.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S203P-Z40/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for S203P-Z40?","answer":"Submit an RFQ through this listing. We source it to order and confirm availability and pricing at quote time."},{"question":"What's the difference between S203P-Z40 and S203-D13?","answer":"The S203-D13 is a 10 A, Curve D breaker — same 3-pole DIN-rail footprint and 10 kA interrupt rating, but the trip curve is much slower (10–20× rated current). The Z40 is for sensitive electronic loads; the D13 is for motor or transformer inrush. They share the same physical dimensions and busbar pattern, so swapping one for the other on the same panel requires no rewiring — just verify the ampacity and trip coordination match the circuit."},{"question":"What is S203P-Z40's listed amps?","answer":"40 A continuous rating."},{"question":"What does Trip Curve Z mean?","answer":"Curve Z trips at 2 to 3 times rated current — for the 40 A unit, that's 80–120 A magnetic trip. It's the fastest standard curve, designed to protect semiconductor circuits and sensitive electronics where a C-curve would pass too much fault energy."},{"question":"Will S203P-Z40 drop into a panel specified around S203-D13 without rewiring?","answer":"Yes — same 3-pole DIN-rail footprint, same busbar spacing. The swap is mechanical; just verify the 40 A rating and Curve Z trip characteristic match the circuit protection requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203P-Z40","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-Z40 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}}