{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S801U-K40","brand":"ABB","brandSlug":"abb","productSlug":"S801U-K40","canonicalUrl":"https://aoctrl.com/abb/S801U-K40","factsUrl":"https://aoctrl.com/api/mcp/products/S801U-K40","rawCanonicalId":null},"summary":{"shortDescription":"ABBTB S801U-K40 MCB S800 1P K 40A, single-pole miniature circuit breaker, K-curve, 40 A rating.","salesMarkdown":"The K-curve means it's designed for motor and transformer loads where inrush current is higher than a resistive circuit — it tolerates short-duration surges without nuisance tripping, then clears hard faults fast. The S800 series uses a compact 1-pole module width, so it fits tight panel layouts where every millimeter of DIN space counts. Terminal capacity handles up to 35 mm² conductor, which is generous for a 40 A breaker and simplifies daisy-chaining busbars or feeding downstream contactors.","metaTitle":"ABBTB S801U-K40 MCB S800 1P K 40A, Current Lifecycle","metaDescription":"ABBTB S801U-K40 MCB S800 1P K 40A single-pole miniature circuit breaker. Lifecycle stage: current. 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":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4724cc2a941ca8061fc81e18e3f3b5a4.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S801U-K40/alternatives.json"},"ai":{"faq":[{"question":"What is the S801U-K40 used for?","answer":"It's a single-pole 40 A miniature circuit breaker with a K-curve, so it's used to protect motor feeders, transformer primaries, and other inductive loads that draw a higher inrush on startup than a standard B- or C-curve breaker would tolerate without tripping."},{"question":"Where can I buy the S801U-K40?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number posted here, but the part is an active catalog line so the channel is open."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S801U-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/S801U-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}}