{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201-D40","brand":"ABB","brandSlug":"abb","productSlug":"S201-D40","canonicalUrl":"https://aoctrl.com/abb/S201-D40","factsUrl":"https://aoctrl.com/api/mcp/products/S201-D40","rawCanonicalId":null},"summary":{"shortDescription":"ABB S201 series, 1-pole miniature circuit breaker, S201-D40, 40 A rated, Trip Curve D, 6 kA interrupting at 277 VAC, UL 1077 supplementary protector, DIN rail mount.","salesMarkdown":"The ABB S201-D40 is a 1-pole miniature circuit breaker rated 40 A with Trip Curve D, meaning it's designed for loads with high inrush currents — motor starters, transformers, or solenoid banks — where the magnetic trip threshold (10–20× In) prevents nuisance tripping on startup. Rated 277 VAC line-to-neutral (or 480 Y/277 VAC three-phase), it covers common North American panel voltages. The DIN-rail footprint snaps into standard 35 mm rail — no adapter needed, and the finger-safe terminals accept stranded or solid copper without ring lugs. Listed as UL 1077 supplementary protector and CSA 22.2 No. 235, so it's recognized for use within an end-use equipment enclosure — not as a service-entrance disconnect, but as branch-circuit protection inside a control panel or machine. That distinction matters when the inspector reads the nameplate. The UL/CSA listing means compliance documentation (RoHS, REACH, UL file) is standard with the shipment.","metaTitle":"S201-D40 Miniature Circuit Breaker 1P D 40A, Trip Curve D, 6","metaDescription":"S201-D40 MCB, 1-pole, 40 A, Trip Curve D, 6 kA interrupting, 277 VAC. UL 1077 supplementary protector. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Amps":"4","Type":"Trip Curve D","Poles":"1","Mounting":"DIN Rail","Volts AC":"277","lifecycle_stage":"current","Interrupt Rating AC":"6 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/584201fb2f144879096765fbec7746f3.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S201-D40/alternatives.json"},"ai":{"faq":[{"question":"What is S201-D40's interrupting rating?","answer":"6 kA at 277 VAC, which covers most supplementary protection needs in commercial and light industrial panels."},{"question":"Will S201-D40 drop into a panel specified for S201MUC-K2 without rewiring?","answer":"Both are 1-pole DIN-rail breakers in the same S200 family footprint, so the mechanical fit is the same. The difference is trip curve: S201-D40 uses Curve D (10–20× In) for high-inrush loads, while S201MUC-K2 uses Curve K (8–12× In) for motor circuits. If the panel was designed for Curve K, swapping to Curve D may change nuisance-trip behavior — verify the load's inrush profile before substituting."},{"question":"Where can I buy S201-D40?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201-D40","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/S201-D40 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}}