{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21374","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21374","canonicalUrl":"https://aoctrl.com/schneider/A9N21374","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21374","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Prodis DT40 MCB, A9N21374, 6 A rated, D curve, 1P+N, 6 kA Icn / 10 kA Icu, DIN rail clip-on, IP20.","salesMarkdown":"The Schneider Electric A9N21374 is a Prodis DT40 miniature circuit breaker rated 6 A with a D tripping curve, 1P+N configuration, and dual-rated breaking capacity of 6000 A Icn per EN/IEC 60898-1 and 10 kA Icu per IEC 60947-2 at 230 V AC. That dual rating matters because it means this MCB qualifies for both residential distribution panels (60898-1) and industrial control panels (60947-2) — one part covers both standards, which simplifies BOM management when a panel needs to meet either code. ## D curve and trip behaviour The D curve magnetic trip operates at 10 to 14 times In (60 to 84 A instantaneous). The thermal-magnetic trip unit handles the overload side; the bimetal element tracks the 6 A continuous rating, so a 7.5 A motor FLA would hold but a 10 A sustained load eventually opens. For a 1P+N breaker, the neutral pole is switched and protected — not just a solid link — which is required on some national wiring rules for final subcircuits. The 78 mm depth leaves clearance behind most standard enclosure gland plates; the 81 mm height fits within a 4-row DIN rail profile without crowding the wiring duct. That's enough lug for a 6 A feed but also handles the larger conductors sometimes run for voltage-drop reasons on long subcircuits.","metaTitle":"A9N21374 DT40 MCB 6A D Curve 1P+N Prodis, 6/10 kA","metaDescription":"A9N21374 DT40 MCB, 6A D curve, 1P+N, 6 kA Icn / 10 kA Icu, DIN rail mount. Current lifecycle stage. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"78 mm","Range":"Prodis","Width":"18 mm","Colour":"White","Height":"81 mm","Standards":"EN/IEC 60898-1 EN/IEC 60947-2","Curve code":"D","9 Mm Pitches":"2","Control type":"Toggle","Network type":"AC","Product name":"DT40","Mounting mode":"Clip-on","Quality labels":"NF","Tropicalisation":"2 conforming to IEC 60068-1","lifecycle_stage":"current","Limitation class":"3 conforming to EN/IEC 60898-1","Local signalling":"ON/OFF indication","Mounting support":"DIN rail","Neutral position":"Left","Pollution degree":"3 conforming to IEC 60947-2","Range of product":"ProDis","Breaking capacity":"6000 A Icn at 230 V AC 50 Hz conforming to EN/IEC 60898-1 10 kA Icu at 230...240 V AC 50 Hz conforming to IEC 60947-2","Device short name":"DT40N","Network frequency":"50 Hz","Poles description":"1P + N","Relative humidity":"95 % at 55 °C","Tightening torque":"2 N.m","Device application":"Distribution","Operating altitude":"2000 m","[In] rated current":"6 A","Overvoltage category":"IV","Trip unit technology":"Thermal-magnetic","Electrical durability":"20000 cycles","Mechanical durability":"20000 cycles","Wire stripping length":"13 mm","Connections - terminals":"Tunnel type terminals downstream 0.33...10 mm² flexible Tunnel type terminals downstream 0.75...16 mm² rigid Tunnel type terminals upstream 0.33...10 mm² flexible Tunnel type terminals upstream 0.75...16 mm² rigid","IP degree of protection":"IP20 conforming to IEC 60529","Magnetic tripping limit":"10...14 x In","Earth-leakage protection":"Separate block","Number of protected poles":"1","Product or component type":"Miniature circuit-breaker","Suitability for isolation":"Yes","Contact position indicator":"Yes","Locking options description":"Padlocking device","[Ui] rated insulation voltage":"400 V AC 50 Hz","[Ue] rated operational voltage":"230 V AC 50 Hz between phase and neutral","Ambient air temperature for storage":"-40...70 °C","Ambient air temperature for operation":"-25...70 °C","[Ics] rated service breaking capacity":"7.5 kA 75 % x Icn at 230 V AC 50 Hz conforming to IEC 60947-2 6000 A 100 % x Icn at 230 V AC 50 Hz conforming to EN/IEC 60898-1","[Uimp] rated impulse withstand voltage":"4 kV conforming to IEC 60947-2"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e061f2c6f4aae41cbe843ad100089dc3.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21374/dt40-circuit-breaker-dt40n-1p-+-n-6a-d-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21374/alternatives.json"},"ai":{"faq":[{"question":"What is A9N21374 used for?","answer":"It is a 6 A D-curve MCB for motor, transformer, and high-inrush loads, dual-rated to EN/IEC 60898-1 and IEC 60947-2, so it works in both residential and industrial panel builds."},{"question":"What breaking capacity does A9N21374 have?","answer":"6000 A Icn per EN/IEC 60898-1 and 10 kA Icu per IEC 60947-2, both at 230 V AC 50 Hz."},{"question":"Where can I buy A9N21374?","answer":"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/A9N21374","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/A9N21374 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}}