{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21378","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21378","canonicalUrl":"https://aoctrl.com/schneider/A9N21378","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21378","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ProDis DT40N MCB, 25 A, D curve, 1P+N, 6 kA Icn / 10 kA Icu, thermal-magnetic trip, clip-on DIN rail.","salesMarkdown":"It protects a single pole plus neutral in a 1P+N configuration, with a thermal-magnetic trip unit that handles both overloads and short circuits. Breaking capacity: 6 kA Icn at 230 V AC (per EN/IEC 60898-1) and 10 kA Icu at 230–240 V AC (per IEC 60947-2). That dual rating means it's certified for both residential-distribution and industrial-panel use — the higher Icu figure gives headroom for fault-current coordination upstream. Clip-on mount to standard 35 mm DIN rail. Width is 18 mm (2 x 9 mm pitches), height 81 mm, depth 78 mm — fits a standard distribution board or sub-panel. Neutral is on the left. IP20 rated (finger-safe terminals).","metaTitle":"Schneider Electric A9N21378 DT40N MCB, 25 A, D Curve, 1P+N,","metaDescription":"Schneider Electric A9N21378 DT40N MCB, 25 A rated, D curve, 1P+N, 6 kA Icn / 10 kA Icu. Active production, 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":"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":"25 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":"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/fc9e03b87794c51587e1b359bf05064b.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21378/dt40-circuit-breaker-dt40n-1p-+-n-25a-d-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21378/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of A9N21378?","answer":"6 kA Icn at 230 V AC per EN/IEC 60898-1, and 10 kA Icu at 230–240 V AC per IEC 60947-2."},{"question":"What is A9N21378's listed depth?","answer":"78 mm."},{"question":"What compliance documentation does this brand provide for A9N21378?","answer":"It is certified to EN/IEC 60898-1 and EN/IEC 60947-2, carries NF quality label, and tropicalisation class 2 per IEC 60068-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21378","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/A9N21378 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}}