{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21405","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21405","canonicalUrl":"https://aoctrl.com/schneider/A9N21405","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21405","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Prodis DT40 miniature circuit breaker, A9N21405, 10 A, C curve, 3P+N, 6 kA Icn at 400 V AC per EN/IEC 60898-1.","salesMarkdown":"The thermal-magnetic trip unit handles overloads and short circuits up to 6 kA Icn at 400 V AC (EN/IEC 60898-1) or 10 kA Icu at 400...415 V AC (IEC 60947-2), so the same breaker covers both domestic and industrial coordination requirements depending on which standard the panel designer follows. The C curve (magnetic trip 5...10 x In) means this breaker tolerates moderate inrush without nuisance tripping — suited for lighting banks, small transformers, or motor circuits where the start-up surge falls within that multiple. The 10 A rating is the continuous thermal current; load current should not exceed it for sustained periods. For panels requiring 10 kA SCCR at the branch, this MCB meets it under the 60947-2 rating. ## Deployment context Tropicalisation level 2 per IEC 60068-1 means it handles 95 % RH at 55 °C, so it can serve in non-air-conditioned electrical rooms in humid climates.","metaTitle":"Schneider Electric A9N21405 DT40 MCB, 10 A, C Curve, 3P+N","metaDescription":"Schneider Electric A9N21405 DT40 miniature circuit breaker, 10 A rated current, C curve, 3P+N, 6 kA breaking capacity per EN/IEC 60898-1. Available to order.","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":"10 A","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":"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/1c45d133c5a4cc9e0381c213bc087792.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21405/dt40-circuit-breaker-dt40n-3p-+-n-10a-c-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21405/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy A9N21405 and how do I get a price?","answer":"This part is sourced to order through independent distribution. Submit an RFQ; availability and current pricing are confirmed at quote time."},{"question":"What is A9N21405's breaking capacity?","answer":"6 kA 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 standards does the A9N21405 comply with?","answer":"It is certified to EN/IEC 60898-1 and EN/IEC 60947-2, with a pollution degree 3 rating per IEC 60947-2 and tropicalisation level 2 per IEC 60068-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21405","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/A9N21405 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}}