{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S202-K40","brand":"ABB","brandSlug":"abb","productSlug":"S202-K40","canonicalUrl":"https://aoctrl.com/abb/S202-K40","factsUrl":"https://aoctrl.com/api/mcp/products/S202-K40","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200 series, S202-K40, 2-pole miniature circuit breaker, 40 A, K-curve, 277 V AC, 6 kA interrupting rating, DIN-rail mount, UL 1077 supplemental protector.","salesMarkdown":"## Integrator note — K-curve supplemental protector The ABB S202-K40 is a 2-pole miniature circuit breaker from the S200 series, rated 40 A with a K-curve trip characteristic and a 277 V AC maximum voltage. Its 6 kA interrupting rating and UL 1077 supplemental protector listing make it suitable for branch-circuit protection in control panels where the upstream device provides the main fault clearing. ## What the K-curve means for your load The K-curve trips magnetically between 8× and 12× rated current (320–480 A for this 40 A breaker). That range is designed for inductive loads — motors, transformers, solenoids — where inrush can exceed 6× but stays below 8×. It avoids nuisance trips on start-up that a B- or C-curve might cause, while still providing short-circuit protection tighter than a D-curve. For a 40 A breaker on a motor branch, the K-curve is a practical choice when the motor full-load current is around 32–36 A and the inrush is under 480 A. ## Compliance documentation Listed as a UL 1077 supplemental protector and CSA 22.2 compliant. The manufacturer typically provides RoHS and REACH declarations on request for this series.","metaTitle":"S202-K40 ABB 40A K-Curve 2-Pole Miniature Circuit Breaker, 6","metaDescription":"ABB S202-K40 40A, 2-pole, K-curve miniature circuit breaker, 277 V AC, 6 kA interrupting rating. UL 1077 supplemental protector. Current lifecycle stage. Available to order — reque","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Amps":"40","Type":"Trip Curve K","Poles":"2","Mounting":"DIN Rail","Volts AC":"277","lifecycle_stage":"current","Interrupt Rating AC":"6 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$26.67","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1b888e9d473400bd32917551d1de57a0.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S202-K40/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for S202-K40?","answer":"The S202-K40 is sourced to order against an RFQ through independent distribution. Submit a request for quote — availability and current pricing are confirmed at quote time."},{"question":"What is S202-K40's listed amps?","answer":"The S202-K40 is rated 40 A continuous."},{"question":"What is S202-K40's trip curve type?","answer":"It uses a K-curve, which trips magnetically between 8× and 12× rated current — suited for inductive loads like motors and transformers."},{"question":"Will S202-K40 drop into a panel specified around S202M-C63 without rewiring?","answer":"Both are 2-pole DIN-rail breakers from the S200 series, so the mechanical footprint and bus-bar spacing are identical. The difference is rating: S202-K40 is 40 A K-curve; S202M-C63 is 63 A C-curve. If the panel was designed for 63 A C-curve, the 40 A K-curve will physically fit but the trip characteristic and ampacity are different — verify coordination with the upstream protection."},{"question":"What compliance documentation does ABB provide for S202-K40?","answer":"The S202-K40 carries UL 1077 and CSA 22.2 listings. RoHS and REACH declarations are typically available from the manufacturer on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S202-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/S202-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}}