{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21379","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21379","canonicalUrl":"https://aoctrl.com/schneider/A9N21379","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21379","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Prodis DT40N, MCB, 1P+N, 32 A, D curve, 6 kA / 10 kA, clip-on DIN rail, white.","salesMarkdown":"The Schneider Electric A9N21379 is a DT40N thermal-magnetic miniature circuit breaker from the Prodis range, rated 32 A with a D tripping curve (magnetic trip between 10 and 14 x In). It is a 1P+N unit — one protected pole plus a switched neutral on the left — and clips onto a DIN rail for panel mounting. The breaker is dual-rated to EN/IEC 60898-1 (6 kA Icn at 230 V AC) and IEC 60947-2 (10 kA Icu at 230…240 V AC), so it can serve both residential-distribution and light-industrial feeder circuits. The 32 A continuous rating (In) sets the maximum steady load this MCB can carry without tripping. The D curve's 10–14 x In magnetic threshold means it will hold through a motor starting surge of roughly 320–448 A for a few cycles before the thermal element takes over — that's the key spec for motor or transformer branch circuits. The dual breaking capacity matters for coordination: 6 kA Icn is the standard for household panels under EN 60898-1, while 10 kA Icu under IEC 60947-2 gives the headroom needed for industrial panelboards where fault currents can be higher. Pollution degree 3 (conforming to IEC 60947-2) means the breaker is rated for the conductive-dust and humidity conditions typical of control cabinets, not just clean indoor residential use. Tunnel terminals accept flexible cable 0.33…10 mm² or rigid 0.75…16 mm² upstream and downstream. The neutral position is on the left, and the toggle provides local ON/OFF indication. IP20 finger-safe terminals are standard for enclosed panels.","metaTitle":"Schneider Electric A9N21379 DT40N MCB, 32 A, D Curve, 1P+N,","metaDescription":"Schneider Electric A9N21379 DT40N MCB, 32 A rated, D curve (10-14x In), 1P+N, 6 kA (Icn) / 10 kA (Icu), dual-rated EN/IEC 60898-1 & 60947-2, clip-on DIN rail. Sourced to order.","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":"32 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/bd9db005b35711814633ced4e511ef4f.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21379/dt40-circuit-breaker-dt40n-1p-+-n-32a-d-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21379/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of A9N21379?","answer":"It is dual-rated: 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. The higher 10 kA figure applies when the breaker is used in an industrial panel under the 60947-2 standard."},{"question":"What does the D curve mean for this MCB?","answer":"The D curve has a magnetic tripping threshold of 10 to 14 times the rated current (In). For the 32 A version, that means the instantaneous trip operates between 320 A and 448 A — designed for loads with high inrush current like small motors, transformers, or welding equipment."},{"question":"Where can I buy the A9N21379 and how is it quoted?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote (RFQ) to confirm current availability and pricing — no stock or price figures are published here."},{"question":"What compliance documentation does Schneider provide for A9N21379?","answer":"The breaker is certified to EN/IEC 60898-1 and IEC 60947-2, carries NF quality labeling, and is tropicalised per IEC 60068-1. The manufacturer typically provides a declaration of conformity and test reports upon request through the supply channel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21379","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/A9N21379 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}}