{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21407","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21407","canonicalUrl":"https://aoctrl.com/schneider/A9N21407","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21407","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ProDis DT40N miniature circuit breaker, A9N21407, 20 A rated, C-curve, 3P+N, 6 kA Icn / 10 kA Icu, thermal-magnetic trip, clip-on DIN rail mount.","salesMarkdown":"The Schneider Electric A9N21407 is a ProDis DT40N miniature circuit breaker rated 20 A with a C-curve trip characteristic (magnetic tripping between 5 and 10 times In). The 3P+N configuration protects three phases and switches the neutral; the neutral pole is unmonitored (no overcurrent protection on N), which is the typical European distribution panel layout. Breaking capacity is dual-rated: 6 kA Icn at 400 V AC per EN/IEC 60898-1 for standard household/commercial duty, and 10 kA Icu at 400–415 V AC per EN/IEC 60947-2 for industrial panel applications. The thermal-magnetic trip unit combines a bimetal strip for overload protection (time-delayed, inversely proportional to current) and a solenoid for short-circuit protection (instantaneous above the magnetic threshold). This is the workhorse trip technology for 95% of distribution MCBs — no electronic adjustment, no auxiliary power needed, just reliable passive operation across the rated temperature range. The 54 mm width (6 x 9 mm pitches) is the standard 3P+N footprint — it occupies the same slot width as any other 3P+N MCB in the ProDis range, so swapping in a replacement or adding downstream devices doesn't require re-spacing the rail. Tunnel-type terminals accept 0.33–10 mm² flexible or 0.75–16 mm² rigid conductors upstream and downstream. The terminal range covers everything from 1.5 mm² lighting circuits up to 16 mm² main feeders — no need for pin ferrules on the flexible side, though ferrules make insertion cleaner on multi-strand. Dual-standard compliance (EN/IEC 60898-1 and EN/IEC 60947-2) means it carries both the 'H' (household) and 'I' (industrial) certifications — one part number covers both the commercial building spec and the industrial panel spec.","metaTitle":"Schneider Electric A9N21407 DT40N MCB, 20 A C-Curve 3P+N","metaDescription":"Schneider Electric A9N21407 DT40N miniature circuit breaker, 20 A rated, C-curve, 3P+N, 6 kA (IEC 60898-1) / 10 kA (IEC 60947-2). Active production, sourced 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":"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":"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/73e43709105b5fff85d8dcb0f22715ae.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21407/dt40-circuit-breaker-dt40n-3p-+-n-20a-c-curve/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21407/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the A9N21407?","answer":"6 kA Icn at 400 V AC per EN/IEC 60898-1 for household/commercial duty, and 10 kA Icu at 400–415 V AC per EN/IEC 60947-2 for industrial panels."},{"question":"Where can I buy the A9N21407 and how is it quoted?","answer":"The A9N21407 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 price and lead time."},{"question":"What compliance documentation does Schneider provide for the A9N21407?","answer":"The A9N21407 carries EN/IEC 60898-1 and EN/IEC 60947-2 certifications, NF quality label, and tropicalisation class 2 per IEC 60068-1. Standard documentation includes the declaration of conformity and test reports per these standards."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21407","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/A9N21407 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}}