{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21408","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21408","canonicalUrl":"https://aoctrl.com/schneider/A9N21408","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21408","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Prodis DT40N miniature circuit breaker, 25 A, C curve, 3P+N, 6 kA Icn (EN/IEC 60898-1) / 10 kA Icu (IEC 60947-2), clip-on DIN rail, IP20.","salesMarkdown":"It clips onto DIN rail and is built for distribution applications in residential and commercial panels. Breaking capacity is dual-rated: 6000 A Icn at 400 V AC per EN/IEC 60898-1 for general distribution, and 10 kA Icu at 400–415 V AC per IEC 60947-2 for industrial coordination. That 10 kA rating gives headroom in sub-distribution boards where fault levels are higher than a standard domestic board. Clip-on mounting to DIN rail (35 mm per EN 60715) — no tools needed for rail attachment. The 3P+N occupies 6 module pitches (9 mm each), so it takes 54 mm of rail width. IP20 finger-safe terminals allow panel wiring without additional shrouding. Compliance covers both the wiring-rule standard (EN/IEC 60898-1) and the industrial standard (EN/IEC 60947-2), so the breaker qualifies for installations where the local code requires either. Operating altitude is limited to 2000 m without derating. Earth-leakage protection requires a separate block (not integrated). The neutral pole is left-positioned, and the toggle provides local ON/OFF indication.","metaTitle":"Schneider Electric A9N21408 DT40N MCB, 25 A, C Curve, 3P+N,","metaDescription":"Schneider Electric A9N21408 DT40N miniature circuit breaker, 25 A rated current, C curve, 3P+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":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"78 mm","Range":"Prodis","Width":"54 mm","Colour":"White","Height":"81 mm","Standards":"EN/IEC 60898-1 EN/IEC 60947-2","Curve code":"C","9 Mm Pitches":"6","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 400 V AC 50 Hz conforming to EN/IEC 60898-1 10 kA Icu at 400...415 V AC 50 Hz conforming to IEC 60947-2","Device short name":"DT40N","Network frequency":"50 Hz","Poles description":"3P + N","Relative humidity":"95 % at 55 °C","Tightening torque":"2 N.m","Device application":"Distribution","Operating altitude":"2000 m","[In] rated current":"25 A","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":"3","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 400 V AC 50 Hz between phases","Ambient air temperature for storage":"-40...70 °C","Ambient air temperature for operation":"-25...70 °C","[Ics] rated service breaking capacity":"6000 A 100 % x Icn at 400 V AC 50 Hz conforming to EN/IEC 60898-1 7.5 kA 75 % x Icu at 400 V AC 50 Hz conforming to IEC 60947-2","[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/2eded1ecd9970d5369927bd0dc425cc5.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21408/dt40-circuit-breaker-dt40n-3p-+-n-25a-c-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21408/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for A9N21408?","answer":"Pricing and availability are confirmed at quote time. Submit an RFQ through the storefront; the response includes current lead time and per-unit pricing for your quantity."},{"question":"What is A9N21408's breaking capacity at 400 V?","answer":"The A9N21408 carries a dual breaking capacity: 6000 A Icn at 400 V AC per EN/IEC 60898-1, and 10 kA Icu at 400–415 V AC per IEC 60947-2."},{"question":"What compliance standards does A9N21408 meet?","answer":"It complies with EN/IEC 60898-1 and EN/IEC 60947-2, with pollution degree 3 per IEC 60947-2 and tropicalisation class 2 per IEC 60068-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21408","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/A9N21408 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}}