{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21376","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21376","canonicalUrl":"https://aoctrl.com/schneider/A9N21376","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21376","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric DT40 series, DT40N miniature circuit breaker, 1P+N, 16 A, D curve, order code A9N21376.","salesMarkdown":"The Schneider Electric A9N21376 is a DT40N miniature circuit breaker (MCB) from the DT40 series, configured as 1P+N with a 16 A rated current and a D tripping curve. This is a single-module (1P+N) unit that switches the phase and provides a switched neutral, common in single-phase final subcircuits where disconnecting the neutral is required by local wiring rules. ## What the D curve means for the panel In a typical industrial or commercial panel, it feeds a motor starter, a small compressor, or a bank of discharge lighting. The D curve's magnetic trip at 10–20× In (160–320 A) clears a hard short without opening on the motor's starting surge, which can pull 6–8× FLA for a few cycles. Coordination with an upstream S-curve or B-curve MCB is straightforward because the D curve's lower instantaneous threshold is higher — selectivity holds for most fault levels below the upstream breaker's magnetic pickup.","metaTitle":"Schneider Electric A9N21376 DT40N MCB, 1P+N, 16A, D Curve","metaDescription":"Schneider Electric A9N21376 DT40N miniature circuit breaker, 1P+N, 16A, D curve. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","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/3a54d82c8922479c764d0b20159950ae.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21376/dt40-circuit-breaker-dt40n-1p-+-n-16a-d-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21376/alternatives.json"},"ai":{"faq":[{"question":"What is A9N21376's listed description?","answer":"The part is described as a DT40 series circuit breaker, DT40N, 1P+N, 16 A, D curve."},{"question":"How do I get current pricing and availability for A9N21376?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21376","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/A9N21376 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}}