{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21370","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21370","canonicalUrl":"https://aoctrl.com/schneider/A9N21370","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21370","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Prodis DT40N, A9N21370, 1P+N miniature circuit breaker, 40 A rated current, C-curve, 6 kA / 10 kA breaking capacity, DIN rail clip-on.","salesMarkdown":"The Schneider Electric A9N21370 is a Prodis DT40N miniature circuit breaker rated 40 A with a C-curve trip characteristic (magnetic tripping at 5 to 10 times In). The 1P+N pole configuration protects one live conductor and switches the neutral, common in single-phase distribution boards where neutral switching is required. Breaking capacity is 6 kA Icn per EN/IEC 60898-1 at 230 V AC, and 10 kA Icu per IEC 60947-2 at 230–240 V AC — the higher Icu figure matters when the breaker is applied in an industrial panel under the 60947-2 standard, where fault currents may exceed the domestic 6 kA limit. Depth 78 mm, height 81 mm — fits standard 80 mm deep enclosures with a few mm to spare. IP20 finger-safe terminals are fine for enclosed panels but not for washdown areas. Dual-certified to EN/IEC 60898-1 (domestic MCB standard) and EN/IEC 60947-2 (industrial circuit-breaker standard), so it qualifies for both residential and light-industrial panels. NF quality label.","metaTitle":"Schneider Electric A9N21370 DT40N MCB, 40 A, 1P+N, C-Curve","metaDescription":"Schneider Electric A9N21370 Prodis DT40N MCB, 40 A rated current, 1P+N, C-curve, 6 kA (Icn) / 10 kA (Icu) breaking capacity. DIN rail mount, IP20. Sourced to order against RFQ.","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":"C","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":"40 A","Overvoltage category":"IV","Trip unit technology":"Thermal-magnetic","Electrical durability":"10000 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":"5...10 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/629a538b7156bddd1467ad074ac2d776.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21370/dt40-circuit-breaker-dt40n-1p-+-n-40a-c-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21370/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21370","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/A9N21370 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}}