{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21389","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21389","canonicalUrl":"https://aoctrl.com/schneider/A9N21389","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21389","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ProDis DT40N miniature circuit breaker, A9N21389, 32 A, 3-pole, C-curve, 6 kA Icn / 10 kA Icu, DIN rail clip-on.","salesMarkdown":"The Schneider Electric A9N21389 is a DT40N miniature circuit breaker from the ProDis range, rated 32 A with a C-curve magnetic trip threshold of 5 to 10 times In. Breaking capacity is 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. The dual rating means this breaker is certified for both the domestic-standard (60898-1) and industrial-standard (60947-2) frameworks — useful when the same panel feeds both a residential riser and an industrial sub-distribution board, or when a consultant specifies 60947-2 for the SCCR headroom. ## Construction and integration Three-pole, three protected poles, thermal-magnetic trip unit. Clips onto DIN rail (EN 60715) — 6 module pitches at 9 mm each, so it occupies 54 mm of rail width. Tunnel terminals accept 0.33–10 mm² flexible or 0.75–16 mm² rigid on both upstream and downstream sides; strip length 13 mm, tighten to 2 N·m. IP20 finger-safe terminals, suitable for enclosure use where the front panel provides the next level of protection. Toggle control with ON/OFF local indication. Rated for 10,000 electrical cycles and 20,000 mechanical cycles.","metaTitle":"Schneider Electric A9N21389 DT40N MCB, 32 A, 3P, C-Curve, 6","metaDescription":"Schneider Electric A9N21389 DT40N miniature circuit breaker, 32 A rated, 3-pole, C-curve, 6 kA Icn (EN 60898-1) / 10 kA Icu (IEC 60947-2). DIN rail clip-on. Active production. Sour","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","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","Relative humidity":"95 % at 55 °C","Tightening torque":"2 N.m","Device application":"Distribution","Operating altitude":"2000 m","[In] rated current":"32 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":"440 V AC 50 Hz","[Ue] rated operational voltage":"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/364df590748cda11a53cab24d15bae3d.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21389/dt40-circuit-breaker-dt40n-3p-32a-c-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21389/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the A9N21389?","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. The dual standard rating covers both domestic and industrial certification requirements."},{"question":"What does the C-curve mean on this breaker?","answer":"The C-curve magnetic trip threshold is 5 to 10 times the rated current (32 A), so it trips magnetically between 160 A and 320 A. This suits general-purpose distribution circuits with moderate inrush — lighting, socket outlets, small motor loads — without nuisance tripping on startup."},{"question":"Where can I buy the A9N21389 and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21389","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/A9N21389 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}}