{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21380","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21380","canonicalUrl":"https://aoctrl.com/schneider/A9N21380","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21380","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ProDis DT40N, A9N21380, miniature circuit breaker MCB, 1P+N, 40 A rated, D curve, 6 kA Icn / 10 kA Icu, clip-on DIN rail.","salesMarkdown":"The Schneider Electric A9N21380 is a ProDis DT40N miniature circuit breaker (MCB) sized for distribution boards. Rated 40 A with a D trip curve, it is built for loads with high inrush — motor starters, small transformers, or lighting ballasts — where the magnetic trip fires between 10 and 14 times the rated current (400 to 560 A instantaneously). The thermal-magnetic trip unit handles the overload side. ## Breaking capacity and dual standard certification This breaker carries dual certification to EN/IEC 60898-1 and EN/IEC 60947-2. Under the domestic-standard 60898-1, the rated breaking capacity (Icn) is 6000 A at 230 V AC. Under the industrial-standard 60947-2, the ultimate breaking capacity (Icu) is 10 kA at 230...240 V AC. That dual rating means the same unit can go into a residential DB (6 kA is enough for most domestic service entrances) or a light-industrial sub-distribution board where fault levels are higher. Overvoltage category IV and pollution degree 3 confirm it is rated for the mains entry point, not just downstream sub-circuits. ## Termination and environment The housing is IP20 finger-safe once installed. Limitation class 3 per 60898-1 limits let-through energy, which helps downstream selectivity with smaller MCBs.","metaTitle":"Schneider A9N21380 DT40N MCB, 40A D Curve 1P+N, 6kA/10kA","metaDescription":"Schneider Electric A9N21380 ProDis DT40N MCB, 40A rated, D curve, 1P+N, 6kA (Icn) / 10kA (Icu) breaking capacity. Dual-certified EN/IEC 60898-1 & 60947-2. Active production. Quoted","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":"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":"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/c7323133d962a8af30a6bdaf7befc608.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21380/dt40-circuit-breaker-dt40n-1p-+-n-40a-d-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21380/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the A9N21380?","answer":"It is rated 6000 A Icn at 230 V AC per EN/IEC 60898-1, and 10 kA Icu at 230...240 V AC per IEC 60947-2. The dual rating covers both residential and light-industrial fault levels."},{"question":"What does the D curve mean on this MCB?","answer":"The D curve sets the magnetic trip threshold at 10 to 14 times the rated current (400 to 560 A for this 40 A unit). That suits loads with high inrush current — motor starters, small transformers, or discharge lighting — without nuisance tripping on startup."},{"question":"Where can I buy the A9N21380 and how is it quoted?","answer":"This part is sourced through independent distribution channels. It is quoted to order against an RFQ; availability and current pricing are confirmed at the time of quotation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21380","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/A9N21380 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}}