{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21387","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21387","canonicalUrl":"https://aoctrl.com/schneider/A9N21387","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21387","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric DT40 series, DT40N, 3-pole, 20 A, C-curve miniature circuit breaker, order code A9N21387.","salesMarkdown":"The Schneider Electric A9N21387 is a DT40N miniature circuit breaker (MCB) in the DT40 series, rated 3-pole, 20 A, with a C trip curve. It's a current-production part, actively manufactured. Snap-mounts onto standard DIN rail inside a panel or enclosure. The 3-pole format handles three-phase circuits up to 20 A per phase. For a panel OEM or wireman, the C-curve characteristic avoids nuisance tripping on transformer or motor-start inrush while still providing short-circuit protection within the MCB's rated breaking capacity.","metaTitle":"Schneider Electric A9N21387 DT40N 3P 20A C-curve MCB","metaDescription":"Schneider Electric A9N21387 DT40N 3P 20A C-curve miniature circuit breaker. Active production. Sourced to order against RFQ. 3-pole, 20 A, C trip curve.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/87d7d91167584edd84c8bcb55ba3f906.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21387/dt40-circuit-breaker-dt40n-3p-20a-c-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21387/alternatives.json"},"ai":{"faq":[{"question":"What is A9N21387's listed description?","answer":"The A9N21387 is described as a DT40 - circuit breaker - DT40N - 3P - 20A - C curve."},{"question":"Where can I buy the A9N21387?","answer":"The A9N21387 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/schneider/A9N21387","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/A9N21387 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}}