Parameter English Value Product Name Circuit Breaker Manufacturer Schneider Electric Series ComPacT NSX new generation Device Short Name NSX250N Part Number / Reference Typically corresponds to C25N42D250 (for 4P, 4D version) Number of Poles 4P Protected Poles Description 4D or 3D + N/2 Rated Current (In) 250 A at 40 °C Rated Operational Voltage (Ue) 690 V AC 50/60 Hz Rated Insulation Voltage (Ui) 800 V AC 50/60 Hz Rated Impulse Withstand (Uimp) 8 kV Performance Level / Breaking Capacity N 50 kA at 415 V AC [Icu] Rated Ultimate Breaking Capacity 90 kA at 220/240 V AC 50 kA at 380/415 V AC 50 kA at 440 V AC 36 kA at 500 V AC 35 kA at 525 V AC 10 kA at 660/690 V AC [Ics] Rated Service Breaking Capacity 50 kA at 380/415 V AC Trip Unit Name MicroLogic 4.2 Trip Unit Technology Electronic Trip Unit Protection Functions L (overload long-time) So (short-time short-circuit with fixed delay) I (instantaneous short-circuit) R (earth-leakage protection) Trip Unit Rating 250 A at 40 °C Long-time Protection (Ir) Adjustment Adjustable 9 settings (100...250 A) Short-time Protection (Isd) Adjustment Adjustable 9 settings (1.5...10 x Ir) Instantaneous Protection (Ii) Adjustment Fixed (3000 A) Earth-leakage Protection (IΔn) Adjustable (30 mA to 5 A) Suitability for Isolation Yes (conforming to EN/IEC 60947-2) Control Type Toggle Circuit Breaker Mounting Mode Fixed (F) Connection Type Front connections Mechanical Durability 20000 cycles Electrical Durability 10000 cycles at 440 V In Width (W) 140 mm Height (H) 161 mm Depth (D) 86 mm Net Weight 2.8 kg Standards EN/IEC 60947 IP Degree of Protection IP40 Ambient Air Temperature for Operation -25…70 °C