{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C25B44B240","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C25B44B240","canonicalUrl":"https://aoctrl.com/schneider/C25B44B240","factsUrl":"https://aoctrl.com/api/mcp/products/C25B44B240","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NSX 250B, 4P, 240 A, MicroLogic 4.2 AB electronic trip unit, 25 kA Icu at 415 V AC, integrated earth-leakage protection.","salesMarkdown":"The Schneider Electric C25B44B240 is a ComPacT NSX 250B moulded-case circuit breaker rated 240 A, 4-pole, with a MicroLogic 4.2 AB electronic trip unit. It is designed for special applications requiring integrated earth-leakage protection (R) alongside overload (L), short-time short-circuit (So), and instantaneous short-circuit (I) protection — all in one device. The B breaking capacity code means 25 kA Icu at 415 V AC, 50/60 Hz per IEC 60947-2. At 240 V AC it delivers 40 kA Icu; at 440 V AC it holds 20 kA Icu. The 4-pole unit occupies a 140 mm width, 161 mm height, 86 mm depth footprint. IP40 enclosure protection, IK07 impact resistance. Pollution degree 3, overvoltage category IV — suited for industrial panels where conductive dust and transient overvoltages are present. Ambient humidity range 0–95 %. ## Durability and signalling Rated for 20,000 mechanical cycles and 20,000 electrical cycles at 440 V In/2, 10,000 cycles at 440 V In, 10,000 cycles at 690 V In/2, and 5,000 cycles at 690 V In. The electrical durability figures are per IEC 60947-2 utilisation category A. Local signalling includes a flashing green LED for ready-to-operate, a red LED at 105 % Ir for overload, and an orange LED at 90 % Ir for pre-alarm. The OFF operating mode uses the IΔn rotary switch for earth-leakage reset and test.","metaTitle":"Schneider Electric C25B44B240 ComPacT NSX 250B 240A MCCB, 25","metaDescription":"Schneider Electric C25B44B240 ComPacT NSX 250B MCCB, 240A rated, 25kA Icu at 415V AC, MicroLogic 4.2 AB trip unit with integrated earth leakage. Active production, sourced to order","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Range":"ComPacT","Depth (D)":"86 mm","Standards":"EN/IEC 60947-2","Width (W)":"140 mm","Height (H)":"161 mm","Control type":"Toggle","Network type":"AC","Product name":"ComPacT NSX","Operating mode":"OFF using the IΔn rotary switch","Thermal memory":"20 minutes before and after tripping","Trip unit name":"MicroLogic 4.2 AB","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 R : for earth-leakage 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":"240 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":"Special application","Operating altitude":"0...2000 m without derating 2000 m...5000 m with derating","[In] rated current":"240 A at 40 °C","Downside connection":"Front","Overvoltage category":"IV","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":"Integrated","Product or component type":"Earth leakage 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":"25 W N 25 W L1 and L3 20.6 W L2","Protected poles description":"4D 3D + N/2 3D","Circuit breaker mounting mode":"Fixed","[Ui] rated insulation voltage":"500 V AC 50/60 Hz","Earth-leakage protection class":"Class A","Trip unit protection functions":"LSoIR","[Ue] rated operational voltage":"440 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":"15 s at 1.5 x Ir 0.5 s at 6 x Ir 0.35 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","[Ir] long-time protection pick-up adjustment range":"140...240 A","[Δt] residual earth-leakage time delay adjustment":"0 ms 60 ms 150 ms 500 ms 1 s","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":"2880 A","Earth-leakage protection sensitity adjustment type IΔn":"Adjustable","Earth-leakage protection time delay adjustement type Δt":"Adjustable","Long-time pick-up adjustment type Ir (thermal protection)":"Adjustable 9 settings","[IΔn] earth-leakage protection sensitivity adjustment range":"30 mA 100 mA 300 mA 500 mA 1 A 3 A 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4e051c4fe5f6040a36d11a23c2157714.pdf","sourceUrl":"https://www.se.com/vn/en/product/C25B44B240/circuit-breaker-compact-nsx250b-25ka-415vac-4-poles-micrologic-vigi-4-2ab-trip-unit-240a/","alternativesUrl":"https://aoctrl.com/api/mcp/products/C25B44B240/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of C25B44B240 at 415 V?","answer":"It delivers 25 kA Icu at 380/415 V AC, 50/60 Hz, conforming to IEC 60947-2. The breaking capacity code is B."},{"question":"What protection functions does the MicroLogic 4.2 AB trip unit provide?","answer":"It provides L (overload long time), So (short-time short-circuit with fixed delay), I (instantaneous short-circuit), and R (earth-leakage) protection — all integrated into one electronic trip unit."},{"question":"What compliance documentation is available for C25B44B240?","answer":"The breaker is certified to EN/IEC 60947-2. It carries IP40 per IEC 60529, IK07 per IEC 62262, and is rated for pollution degree 3 per IEC 60664-1 and overvoltage category IV. No RoHS or REACH declarations are in this evidence set, but as a current-production Schneider part, those declarations are typically available on request."},{"question":"What is the physical size of C25B44B240?","answer":"Width 140 mm, height 161 mm, depth 86 mm. It mounts on a backplate in horizontal or vertical orientation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C25B44B240","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/C25B44B240 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}