{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C25B4","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C25B4","canonicalUrl":"https://aoctrl.com/schneider/C25B4","factsUrl":"https://aoctrl.com/api/mcp/products/C25B4","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric, ComPacT NSX, basic frame, C25B4, 250A frame rating, 4 poles, 25kA/415VAC breaking capacity.","salesMarkdown":"It carries a 25 kA Icu breaking capacity at 380/415 V AC (50/60 Hz) per IEC 60947-2, and 20 kA Icu at 440 V. The frame is fixed-mount, backplate style, with front-front connections (both line and load terminate on the front face). The 140 mm width and 161 mm height fit standard ComPacT panel cutouts. This is a basic frame — no trip unit included. You order the C25B4 as the chassis and separately select the appropriate Micrologic trip unit (electronic) or TM trip (thermal-magnetic) for the protection curve your load needs. The 250 A frame rating is the maximum continuous current the frame can carry; the trip unit sets the actual protection threshold. The C25B4 carries dual certification: EN/IEC 60947-2 and UL 60947-4-1. That's a 100% Ics/Icu ratio at 415 V, which is good for selectivity studies and avoids nuisance replacement after a fault. That covers distribution panels fed from a transformer secondary, not just final subcircuits. The frame is isolation-suitable per EN/IEC 60947-2 — you can use it as a visible-break disconnect for safe maintenance if the trip unit and handle position indicate open contacts. Class II insulation on the front face means no earth connection needed on the operator interface. Mechanical endurance is 20,000 cycles; electrical endurance varies with voltage and current, reaching 20,000 cycles at 440 V at half rated current.","metaTitle":"Schneider Electric C25B4 ComPacT NSX250B Basic Frame, 250A 4","metaDescription":"Schneider Electric C25B4 ComPacT NSX250B basic frame, 250A frame rating, 4 poles, 25kA/415VAC breaking capacity. Active 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":"C25B4","Depth (D)":"86 mm","Standards":"EN/IEC 60947-2 UL 60947-4-1","Width (W)":"140 mm","Height (H)":"161 mm","description":"Circuit breaker basic frame, ComPacT NSX250B, 25kA/415VAC, 4 poles, 250A frame rating, without trip unit","Control type":"Toggle","Network type":"AC","Product name":"ComPacT NSX","Mounting mode":"Fixed","Protection type":"Without protection","lifecycle_stage":"current","Connection pitch":"35 mm","Mounting support":"Backplate","Neutral position":"Left","Pollution degree":"3 conforming to IEC 60664-1","Breaking capacity":"15 kA Icu at 500 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 25 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 40 kA Icu at 220/240 V AC 50/60 Hz conforming to IEC 60947-2","Device short name":"NSX250B","Network frequency":"50/60 Hz","Poles description":"4P","Upside connection":"Front","Device application":"Distribution","[In] rated current":"250 A at 40 °C","Downside connection":"Front","Overvoltage category":"III","Utilisation category":"Category A","Electrical durability":"10000 cycles 440 V AC 50/60 Hz In conforming to IEC 60947-2 10000 cycles 690 V AC 50/60 Hz In/2 conforming to IEC 60947-2 20000 cycles 440 V AC 50/60 Hz In/2 conforming to IEC 60947-2 5000 cycles 690 V AC 50/60 Hz In conforming to IEC 60947-2","Mechanical durability":"20000 cycles conforming to IEC 60947-2","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","Product or component type":"Basic frame","Suitability for isolation":"Yes conforming to EN/IEC 60947-2","[Ui] rated insulation voltage":"800 V AC 50/60 Hz conforming to IEC 60947-2","[Ue] rated operational voltage":"690 V AC 50/60 Hz conforming to IEC 60947-2","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":"20 kA at 440 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 40 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 15 kA at 500 V AC 50/60 Hz conforming to IEC 60947-2","[Uimp] rated impulse withstand voltage":"8 kV conforming to IEC 60947-2"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$294.25 – $448.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9411ee005184b35db581232be90fbc07.pdf","sourceUrl":"https://www.se.com/ph/en/product/C25B4/circuit-breaker-basic-frame-compact-nsx250b-25ka-415vac-4-poles-250a-frame-rating-without-trip-unit/"},"ai":{"faq":[{"question":"Where can I buy C25B4 and how do I get a price?","answer":"The C25B4 is available to order through independent distribution. Submit an RFQ for current pricing and availability — we confirm both at quote time."},{"question":"What is C25B4's breaking capacity at 415 V?","answer":"The C25B4 has a rated ultimate breaking capacity (Icu) of 25 kA at 380/415 V AC 50/60 Hz per IEC 60947-2, and a service breaking capacity (Ics) of 25 kA at the same voltage — a 100% ratio."},{"question":"What compliance documentation does Schneider provide for C25B4?","answer":"The C25B4 carries EN/IEC 60947-2 and UL 60947-4-1 certifications, with IEC 60947-2 isolation suitability. It meets pollution degree 3 per IEC 60664-1 and overvoltage category III. Standard RoHS/REACH declarations are available from Schneider Electric."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C25B4","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/C25B4 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}}