{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C40F42D250","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C40F42D250","canonicalUrl":"https://aoctrl.com/schneider/C40F42D250","factsUrl":"https://aoctrl.com/api/mcp/products/C40F42D250","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NSX, NSX400F frame, 4P, 250 A at 40 °C, MicroLogic 2.3 electronic trip unit, 40 kA Icu at 240 V AC, toggle control.","salesMarkdown":"The Schneider Electric C40F42D250 is a ComPacT NSX moulded-case circuit breaker on the NSX400F frame, 4-pole, rated 250 A at 40 °C. It carries a MicroLogic 2.3 electronic trip unit with L-So-I protection: long-time overload, short-time short-circuit with fixed delay, and instantaneous short-circuit. The 40 kA Icu at 240 V AC (36 kA at 415 V, 30 kA at 440 V, 20 kA at 525 V, 10 kA at 690 V) means it safely interrupts fault currents up to those levels without upstream cascade — sized for distribution panels where high available fault current is a given. ## Trip unit and protection logic That matters for motor or transformer feeders where repeated inrush can nuisance-trip a plain thermal breaker. The L (long-time) curve handles overload, So provides a fixed-delay short-time window for selective coordination downstream, and I clears instantaneous faults. No earth-leakage module on this variant. Dimensions: 255 mm high, 185 mm wide, 110 mm deep. Front connections both top and bottom. IP40 enclosure protection, IK07 impact resistance. Six accessory slots on the left-side neutral position give room for shunt trips, aux contacts, or motor mechanisms. Overvoltage category III, utilisation category A. Relative humidity 0–95 %. The breaker carries UL 60947-4-1 listings for the North American market with 85 kA Icu at 240 V AC, 35 kA at 480 V, 20 kA at 600 V.","metaTitle":"C40F42D250 ComPacT NSX 250 A 4P Circuit Breaker, 40 kA Icu","metaDescription":"Schneider Electric C40F42D250 ComPacT NSX 250 A 4P MCCB with MicroLogic 2.3 electronic trip unit. 40 kA Icu at 240 V AC. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Range":"ComPacT","title":"C40F42D250","Depth (D)":"110 mm","Standards":"EN/IEC 60947-2","Width (W)":"185 mm","Height (H)":"255 mm","description":"Circuit breaker ComPacT NSX400F, 36kA at 415VAC, MicroLogic 2.3 trip unit 250A, 4 poles 4d","Control type":"Toggle","Network type":"AC","Product name":"ComPacT NSX","Thermal memory":"20 minutes before and after tripping","Trip unit name":"MicroLogic 2.3","Number of slots":"6 slot(s)","Protection type":"L : for overload protection (long time) So : for short time short-circuit protection with fixed delay I : for instantaneous short-circuit protection","lifecycle_stage":"current","Connection pitch":"45 mm","Local signalling":"Flashing LED (green) for ready to operate LED 105 % Ir (red) for overload LED 90 % Ir (orange) for overload","Mounting support":"Backplate","Neutral position":"Left","Pollution degree":"3 conforming to IEC 60664-1","Trip unit rating":"250 A at 40 °C","Breaking capacity":"40 kA Icu at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 36 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 30 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2 25 kA Icu at 500 V AC 50/60 Hz conforming to IEC 60947-2 20 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 35 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":"NSX400F","Mounting position":"Horizontal and vertical Flat on the back","Network frequency":"50/60 Hz","Poles description":"4P","Relative humidity":"0...95 %","Upside connection":"Front","Device application":"Distribution","Operating altitude":"0...2000 m without derating 2000 m...5000 m with derating","[In] rated current":"250 A at 40 °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":"F 36 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","Neutral protection setting":"0.5 x Ir (3D + N/2) 1 x Ir (4D) No protection (3D)","Power dissipation per pole":"19.2 W","Protected poles description":"4D 3D + N/2 3D","Circuit breaker mounting mode":"Fixed","[Ui] rated insulation voltage":"800 V AC 50/60 Hz","Trip unit protection functions":"LSoI","[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":"40 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 36 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 30 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2 25 kA at 500 V AC 50/60 Hz conforming to IEC 60947-2 10 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","[Tr] Long-Time Delay Adjustment Range":"400 s at 1.5 x Ir 16 s at 6 x Ir 11 s at 7.2 x Ir","[Uimp] rated impulse withstand voltage":"8 kV","Long-time protection delay adjustment type tr":"Fixed","Short-time protection delay adjustment type tsd":"Fixed","Short-time protection pick-up adjustment type Isd":"Adjustable 9 settings","[Ir] long-time protection pick-up adjustment range":"70...250 A","Instantaneous protection pick-up adjustment type Ii":"Fixed","[Isd] Short-time protection pick-up adjustment range":"1.5...10 x Ir","[Ii] instantaneous protection pick-up adjustment range":"3000 A","Long-time pick-up adjustment type Ir (thermal protection)":"Adjustable 9 settings"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$892.97","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/421e08524e24dbd6e0b0b801b126c6a7.pdf","sourceUrl":"https://www.se.com/ae/en/product/C40F42D250/circuit-breaker-compact-nsx400f-36ka-at-415vac-micrologic-2-3-trip-unit-250a-4-poles-4d/"},"ai":{"faq":[{"question":"What are the key ratings of the C40F42D250?","answer":"Rated 250 A at 40 °C, 4-pole, with a MicroLogic 2.3 electronic trip unit. Breaking capacity is 40 kA Icu at 240 V AC, 36 kA at 415 V, 30 kA at 440 V, 20 kA at 525 V, and 10 kA at 690 V. Mechanical durability is 15,000 cycles."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C40F42D250","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/C40F42D250 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}}