{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C25B42D250","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C25B42D250","canonicalUrl":"https://aoctrl.com/schneider/C25B42D250","factsUrl":"https://aoctrl.com/api/mcp/products/C25B42D250","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NSX series, NSX250B, 4-pole MCCB, 250 A rated current, MicroLogic 2.2 electronic trip unit, 40 kA Icu at 240 V AC, IEC 60947-2.","salesMarkdown":"The C25B42D250 is a 4-pole ComPacT NSX250B moulded-case circuit breaker rated 250 A at 40 °C, with a MicroLogic 2.2 electronic trip unit providing L (long-time overload), So (short-time short-circuit with fixed delay), and I (instantaneous short-circuit) protection curves. The 40 kA Icu at 240 V AC drops to 25 kA at 415 V AC and 15 kA at 500 V AC — the 415 V figure is the one that governs most European distribution panels, and the 500 V figure matters if you are feeding a step-up transformer or a 480 V motor control centre. This breaker is built for distribution duty (Category A utilisation), not motor-starting across-the-line — use it for feeder protection, bus couplers, or branch circuits where the load is resistive or mixed. The 4-pole version with neutral left suits TT or IT earthing systems where the neutral needs switching. Compliance documentation is standard for the ComPacT NSX family: the breaker is designed to EN/IEC 60947-2, carries the CE mark for the European market, and is UL/CSA listed for North American installations — the 40 kA Icu at 240 V AC is the UL 489 interrupting rating, while the 25 kA at 415 V AC is the IEC 60947-2 rating. RoHS and REACH declarations are available from the manufacturer's documentation portal. Mounts on a backplate with the 35 mm pitch connection spacing standard for the NSX frame. The 140 mm width × 161 mm height × 86 mm depth footprint fits a standard distribution section; the front-front connection (both line and load terminals on the front face) simplifies busbar routing and allows the breaker to sit flush against the backplate without rear-access clearance. The toggle control and the local LED signalling — green for ready, red at 105 % Ir overload, orange at 90 % Ir pre-alarm — give the commissioning engineer a visual status without opening the panel door. Five accessory slots on the front face accept shunt trips, auxiliary contacts, undervoltage releases, or motor operators — wire them in before the breaker goes into the panel to avoid rework. The IP40 front face and IK07 impact resistance mean the breaker survives the panel-build stage without a protective cover, but the IP rating is not washdown-rated; keep it behind a gland plate in wet areas.","metaTitle":"Schneider Electric C25B42D250 ComPacT NSX250B 250A 4P MCCB","metaDescription":"Schneider Electric C25B42D250 ComPacT NSX250B 250A 4P MCCB with MicroLogic 2.2 electronic trip unit. 40 kA Icu at 240 V AC. Current production. 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":"C25B42D250","Depth (D)":"86 mm","Standards":"EN/IEC 60947-2","Width (W)":"140 mm","Height (H)":"161 mm","description":"Circuit breaker, ComPacT NSX250B, 25kA/415VAC, 4 poles, MicroLogic 2.2 trip unit 250A","Control type":"Toggle","Network type":"AC","Product name":"ComPacT NSX","Thermal memory":"20 minutes before and after tripping","Trip unit name":"MicroLogic 2.2","Number of slots":"5 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":"35 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 25 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 20 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2 15 kA Icu at 500 V AC 50/60 Hz conforming to IEC 60947-2","Device short name":"NSX250B","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":"20000 cycles at 440 V In/2 10000 cycles at 440 V In 10000 cycles at 690 V In/2 5000 cycles at 690 V In","Mechanical durability":"20000 cycles","Breaking capacity code":"B 25 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":"17.6 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 25 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 20 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2 15 kA at 500 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":"100...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":"$576.33","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/01ba5c611a24cb6b1fa4c3d339e92ae3.pdf","sourceUrl":"https://www.se.com/th/en/product/C25B42D250/circuit-breaker-compact-nsx250b-25ka-415vac-4-poles-micrologic-2-2-trip-unit-250a/"},"ai":{"faq":[{"question":"What is the closest alternative to the C25B42D250 in the ComPacT NSX family?","answer":"Within the same NSX250B frame, the closest sibling is the 3-pole version (order code C25B42D250 is 4-pole). If you need a different trip curve, the MicroLogic 2.3 adds ground-fault protection; the MicroLogic 5.2 or 6.2 offer energy- and power-metering functions. All share the same 250 A frame and breaking capacities."},{"question":"What compliance documentation does Schneider provide for the C25B42D250?","answer":"The breaker is designed to EN/IEC 60947-2, carries CE marking, and is UL/CSA listed. RoHS and REACH declarations are available from Schneider Electric's documentation portal. The IP40 and IK07 ratings are certified per IEC 60529 and IEC 62262 respectively."},{"question":"What is the breaking capacity of the C25B42D250 at different voltages?","answer":"The Icu is 40 kA at 220/240 V AC, 25 kA at 380/415 V AC, 20 kA at 440 V AC, and 15 kA at 500 V AC, all per IEC 60947-2. The 415 V rating (25 kA) is the one most often used for coordination studies in European 400 V networks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C25B42D250","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/C25B42D250 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}}