{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C25B3","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C25B3","canonicalUrl":"https://aoctrl.com/schneider/C25B3","factsUrl":"https://aoctrl.com/api/mcp/products/C25B3","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NSX250B basic frame, 3 poles, 250 A frame rating at 40 °C, 25 kA Icu at 415 V AC, without trip unit, toggle control, fixed mounting.","salesMarkdown":"## C25B3 — ComPacT NSX250B Basic Frame, 250 A, 25 kA The C25B3 is a Schneider Electric ComPacT NSX250B basic frame — a 3-pole, 250 A frame rated at 40 °C, designed for distribution applications where you add your own trip unit. It carries a 25 kA Icu at 380/415 V AC 50/60 Hz (breaking capacity code B), with higher interrupting ratings at lower voltages: 40 kA at 220/240 V AC, 20 kA at 440 V AC, and 15 kA at 500 V AC, all conforming to IEC 60947-2. This is a fixed-mount, backplate-mounted frame with front-front connections (both line and load side). The toggle control gives a clear visual indication of contact position. Rated operational voltage goes up to 690 V AC 50/60 Hz, with an insulation voltage of 800 V AC and an impulse withstand of 8 kV. Electrical durability is 10,000 cycles at rated current (440 V), 20,000 cycles at half-rated current. That's standard for a molded-case frame in this class — fine for most distribution and motor-circuit applications, but if you're switching a load multiple times per shift, you'll want to track cycles against the mechanical life. ## Sourcing and lifecycle — active, but needs the trip unit Standards compliance covers EN/IEC 60947-2 (circuit breakers) and UL 60947-4-1 (contactors/motor-starters) — so it's dual-certified for IEC and UL installations. The front face is Class II shock-protected. If you're working to a panel that needs an isolation switch, the 'suitability for isolation' mark (per EN/IEC 60947-2) covers that requirement. ## Integration — mounting and connections Fixed mount on a backplate (not DIN-rail). The 105 mm width, 161 mm height, and 86 mm depth fit the standard ComPacT NSX cutout — if you're retrofitting an older NS or NSJ frame, check the mounting hole pattern. Connection pitch is 35 mm between poles. Front-front connections mean both line and load terminations are accessible from the front of the panel, which simplifies wiring and maintenance access.","metaTitle":"Schneider Electric C25B3 ComPacT NSX250B, 250A Frame, 25kA/4","metaDescription":"C25B3 ComPacT NSX250B basic frame, 3-pole, 250A at 40°C, 25kA Icu at 415VAC. Active production. Sourced to order. EN/IEC 60947-2, UL 60947-4-1.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Range":"ComPacT","title":"C25B3","Depth (D)":"86 mm","Standards":"EN/IEC 60947-2 UL 60947-4-1","Width (W)":"105 mm","Height (H)":"161 mm","description":"Circuit breaker basic frame, ComPacT NSX250B, 25kA/415VAC, 3 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","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":"3P","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":"$226.00 – $316.32","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ab56248b70c4a040e98343e55486cdc7.pdf","sourceUrl":"https://www.se.com/sa/en/product/C25B3/circuit-breaker-basic-frame-compact-nsx250b-25ka-415vac-3-poles-250a-frame-rating-without-trip-unit/"},"ai":{"faq":[{"question":"What is C25B3's rated breaking capacity?","answer":"The C25B3 has a breaking capacity of 25 kA Icu at 380/415 V AC 50/60 Hz, 20 kA at 440 V AC, 40 kA at 220/240 V AC, and 15 kA at 500 V AC, all per IEC 60947-2. The service breaking capacity (Ics) matches these values at each voltage level."},{"question":"What standards does C25B3 comply with?","answer":"The C25B3 complies with EN/IEC 60947-2 and UL 60947-4-1. It is also rated for isolation per EN/IEC 60947-2, with an 8 kV impulse withstand voltage and pollution degree 3 per IEC 60664-1."},{"question":"Where can I buy C25B3 and get current pricing?","answer":"The C25B3 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."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C25B3","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/C25B3 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}}