{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201-K40","brand":"ABB","brandSlug":"abb","productSlug":"S201-K40","canonicalUrl":"https://aoctrl.com/abb/S201-K40","factsUrl":"https://aoctrl.com/api/mcp/products/S201-K40","rawCanonicalId":null},"summary":{"shortDescription":"ABB S201-K40, 40 A, K-curve, 1-pole DIN-rail miniature circuit breaker, 277 V AC, 6 kA interrupting rating, UL 1077 supplemental protector.","salesMarkdown":"The S201-K40 is a single-pole miniature circuit breaker from the S200 series, rated 40 A continuous at 277 V AC line-to-neutral. The K-curve trips magnetically between 10× and 14× rated current — faster than a C-curve on moderate overloads, slower than a Z-curve. That characteristic suits motor-starting and transformer inrush loads where a brief current surge should not nuisance-trip the branch, but a hard fault still clears within the 6 kA interrupting rating. Rated 277 V AC line-to-neutral, so it fits single-phase branch circuits in 480Y/277 V wye panels as a supplemental protector per UL 1077. CSA 22.2 listed alongside the UL mark, covering Canadian panel builds. The 40 A rating and K-curve make it a common choice for motor control center feeder protection or HVAC compressor circuits where the inrush profile exceeds what a C-curve allows.","metaTitle":"S201-K40 40A K-Curve 1-Pole DIN Rail MCB, 277V AC","metaDescription":"S201-K40 40A, K-curve, 1-pole DIN-rail miniature circuit breaker. 277V AC, 6 kAIC. UL 1077 supplemental protector. Current production — quoted 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":"40","Type":"Trip Curve K","Poles":"1","Mounting":"DIN Rail","Volts AC":"277","lifecycle_stage":"current","Interrupt Rating AC":"6 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$173.75","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1b888e9d473400bd32917551d1de57a0.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S201-K40/alternatives.json"},"ai":{"faq":[{"question":"What is S201-K40's listed amps and trip curve?","answer":"Rated 40 A continuous with a K-curve magnetic trip characteristic (10× to 14× In). Single-pole, 277 V AC, 6 kA interrupting rating."},{"question":"Will S201-K40 drop into a panel that was specified around S201M-C3 without rewiring?","answer":"Physically yes — both are 1-pole DIN-rail breakers in the same S200 footprint. Electrically the S201M-C3 is a 3 A C-curve, so the S201-K40 at 40 A K-curve is a different rating and trip characteristic; verify the branch circuit's ampacity and coordination study before substituting."},{"question":"What compliance documentation does this brand provide for S201-K40?","answer":"UL 1077 and CSA 22.2 listed per the specification. RoHS and REACH declarations are standard for ABB's S200 series — request compliance certificates at quote time."},{"question":"Who supplies S201-K40 and how is it quoted for volume purchases?","answer":"Sourced through independent industrial-automation distribution. Quoted to order against an RFQ; availability and current pricing confirmed at quote time. No minimum order quantity restrictions for this active line item."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201-K40","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-K40 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}}