{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C40N31M320","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C40N31M320","canonicalUrl":"https://aoctrl.com/schneider/C40N31M320","factsUrl":"https://aoctrl.com/api/mcp/products/C40N31M320","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NSX400N, circuit breaker, 3P, 320 A, MicroLogic 1.3 M electronic trip unit, 85 kA Icu at 240 V AC, motor protection.","salesMarkdown":"Schneider Electric C40N31M320 is a ComPacT NSX400N molded-case circuit breaker, 3-pole, rated 320 A at 65 °C with a MicroLogic 1.3 M electronic trip unit. It's built for motor protection — the 'M' in the trip unit designation means it carries motor-specific curves for starting inrush and overload. Backplate-mounted, front-connected, and toggle-operated, it fits a standard panel layout with 140 mm width and 255 mm height. At 480 V AC it still holds 50 kA Icu, so it coordinates cleanly with downstream 18 kA or 25 kA rated feeders. The 85 kA at 240 V AC is the high side for 208/240 V distribution. Utilisation category A means it's not intended for frequent switching under load — that's the contactor's job. It's a protection device first. ## Trip unit and motor protection The S curve lets you set a deliberate delay for selectivity with downstream breakers — you can let a branch fault clear before the main trips. The I curve handles the short-circuit instant. Because it's electronic, it holds its calibration over temperature better than a thermal-magnetic unit. Power dissipation is 12.29 W per pole — factor that into your enclosure cooling calculation. ## Physical integration Mounts on a backplate — no DIN rail. Front connections top and bottom, 45 mm connection pitch. Six accessory slots for shunt trips, aux contacts, or communication modules. IP40 enclosure protection, IK07 impact resistance. Horizontal or vertical mounting allowed, flat on the back.","metaTitle":"Schneider Electric C40N31M320 ComPacT NSX400N, 320 A, 85 kA","metaDescription":"Schneider Electric C40N31M320 ComPacT NSX circuit breaker. 320 A, 85 kA Icu at 240 V AC, MicroLogic 1.3 M trip unit. Motor protection. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Range":"ComPacT","title":"C40N31M320","Depth (D)":"110 mm","Standards":"EN/IEC 60947-2","Width (W)":"140 mm","Height (H)":"255 mm","description":"Circuit breaker ComPacT NSX400N, 50kA at 415VAC, MicroLogic 1.3 M trip unit 320A, 3 poles 3d","Control type":"Toggle","Network type":"AC","Product name":"ComPacT NSX","Trip unit name":"MicroLogic 1.3 M","Number of slots":"6 slot(s)","Protection type":"S : for short time short-circuit protection I : for instantaneous short-circuit protection","lifecycle_stage":"current","Connection pitch":"45 mm","Local signalling":"Flashing LED (green) for ready to operate","Mounting support":"Backplate","Pollution degree":"3 conforming to IEC 60664-1","Trip unit rating":"320 A at 65 °C","Breaking capacity":"85 kA Icu at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 50 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 42 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2 30 kA Icu at 500 V AC 50/60 Hz conforming to IEC 60947-2 22 kA Icu at 525 V AC 50/60 Hz conforming to IEC 60947-2 10 kA Icu at 660/690 V AC 50/60 Hz conforming to IEC 60947-2 85 kA Icu at 240 V AC 50/60 Hz conforming to UL 60947-4-1 50 kA Icu at 480 V AC 50/60 Hz conforming to UL 60947-4-1 20 kA Icu at 600 V AC 50/60 Hz conforming to UL 60947-4-1","Device short name":"NSX400N","Mounting position":"Horizontal and vertical Flat on the back","Network frequency":"50/60 Hz","Poles description":"3P","Relative humidity":"0...95 %","Upside connection":"Front","Device application":"Motor protection","Operating altitude":"0...2000 m without derating 2000 m...5000 m with derating","[In] rated current":"320 A at 65 °C","Downside connection":"Front","Overvoltage category":"III","Trip unit technology":"Electronic","Utilisation category":"Category A","Electrical durability":"12000 cycles at 440 V In/2 6000 cycles at 440 V In 6000 cycles at 690 V In/2 3000 cycles at 690 V In","Mechanical durability":"15000 cycles","Breaking capacity code":"N 50 kA 415 V AC","IK degree of protection":"IK07 conforming to IEC 62262","IP degree of protection":"IP40 conforming to IEC 60529","Earth-leakage protection":"Without","Product or component type":"Circuit breaker","Suitability for isolation":"Yes conforming to EN/IEC 60947-2","Power dissipation per pole":"12.29 W","Protected poles description":"3D","Circuit breaker mounting mode":"Fixed","[Ui] rated insulation voltage":"800 V AC 50/60 Hz","Trip unit protection functions":"SI","[Ue] rated operational voltage":"690 V AC 50/60 Hz","Zone selective interlocking ZSI":"Without","Electrical shock protection class":"Class II on front face","Ambient air temperature for storage":"-50...85 °C","Ambient air temperature for operation":"-25...70 °C","[Ics] rated service breaking capacity":"85 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 50 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 42 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2 30 kA at 500 V AC 50/60 Hz conforming to IEC 60947-2 11 kA at 525 V AC 50/60 Hz conforming to IEC 60947-2 10 kA at 660/690 V AC 50/60 Hz conforming to IEC 60947-2","[Uimp] rated impulse withstand voltage":"8 kV","Short-time protection delay adjustment type tsd":"Fixed","Short-time protection pick-up adjustment type Isd":"Adjustable 9 settings","Instantaneous protection pick-up adjustment type Ii":"Fixed","[Isd] Short-time protection pick-up adjustment range":"1600 A 1920 A 2440 A 2560 A 2880 A 3200 A 3520 A 3840 A 4160 A","[Ii] instantaneous protection pick-up adjustment range":"4800 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$709.19","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b9a249c75de99faa81a43b48ee1495e3.pdf","sourceUrl":"https://www.se.com/sg/en/product/C40N31M320/circuit-breaker-compact-nsx400n-50ka-at-415vac-micrologic-1-3-m-trip-unit-320a-3-poles-3d/"},"ai":{"faq":[{"question":"How do I get current pricing and availability for C40N31M320?","answer":"The 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 quote."},{"question":"What is C40N31M320's breaking capacity at 415 V?","answer":"50 kA Icu at 380/415 V AC 50/60 Hz per IEC 60947-2, which is the N breaking capacity code."},{"question":"What compliance documentation does Schneider provide for C40N31M320?","answer":"The breaker is certified to EN/IEC 60947-2 and UL 60947-4-1. It carries suitability for isolation per EN/IEC 60947-2. Pollution degree 3 per IEC 60664-1 and overvoltage category III per IEC 60947-2 are documented. Specific RoHS/REACH declarations are available from Schneider Electric's product compliance portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C40N31M320","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/C40N31M320 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}