{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21397","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21397","canonicalUrl":"https://aoctrl.com/schneider/A9N21397","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21397","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ProDis DT40N, miniature circuit-breaker, 20 A, 3P, D curve, 6 kA Icn / 10 kA Icu, clip-on DIN rail.","salesMarkdown":"The 6 kA Icn (per EN/IEC 60898-1) is the rated short-circuit capacity for general distribution; the 10 kA Icu (per IEC 60947-2) is the ultimate breaking capacity at 400...415 V AC, giving you SCCR headroom for industrial panel coordination studies. Three poles protected (3P), thermal-magnetic trip unit, 50 Hz network frequency. The clip-on mounting snaps onto standard DIN rail — 6 module pitches (54 mm wide) so it occupies the expected footprint for a 3-pole MCB. Tightening torque 2 N·m, strip length 13 mm. This breaker carries dual certification to EN/IEC 60898-1 (the household / similar installation standard) and EN/IEC 60947-2 (the industrial low-voltage switchgear standard). In practice, that means it can serve in a distribution board under the domestic standard's 6 kA Icn rating, but also qualifies for industrial panel use where the 60947-2 rating of 10 kA Icu applies. Pollution degree 3 (conductive pollution typical in industrial enclosures) and limitation class 3 per 60898-1 confirm it limits let-through energy for downstream equipment protection.","metaTitle":"Schneider Electric A9N21397 DT40N MCB, 20A 3P D-Curve, 6kA/1","metaDescription":"Schneider Electric A9N21397 DT40N miniature circuit-breaker, 20A 3-pole D-curve, 6kA Icn / 10kA Icu breaking capacity. Active production, sourced to order. Quoted 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":"D","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":"20 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":"10...14 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/6ac77649cb2ea8dda58705bb363f6da9.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21397/dt40-circuit-breaker-dt40n-3p-20a-d-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21397/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of A9N21397?","answer":"6 kA 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 panel duty."},{"question":"Where can I buy A9N21397 and how is it quoted?","answer":"This part is 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 commercial offer."},{"question":"What compliance documentation does Schneider provide for A9N21397?","answer":"The breaker carries EN/IEC 60898-1 and EN/IEC 60947-2 certification, NF quality label, and tropicalisation per IEC 60068-1. Pollution degree 3 and limitation class 3 are documented. For specific RoHS/REACH/UL declarations, the manufacturer's compliance documentation is available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21397","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/A9N21397 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}}