Specifications Parameter Specification Manufacturer Schneider Electric Product Series ComPacT NSX400N Model / Type Compact NSX400N 3P 250 A MCCB Poles 3P (3 protected phases) Rated Current (In) 250 A (at 40 °C) Rated Operational Voltage (Ue) 690 V AC, 50/60 Hz Network Type AC three‑phase Trip Unit (typical) MicroLogic 2.3 electronic trip unit with protection functions (Long‑time, Short‑time, Instantaneous, Earth‑fault) Protection Functions L, S, O, I (Long‑time, Short‑time, Instantaneous, Earth‑fault) — adjustable Utilisation Category Category A (general distribution) Short‑Circuit Breaking Capacity (Icu) varies by voltage: • ~85 kA @ 220/240 V AC (IEC) • ~50 kA @ 380/415 V AC (IEC) • ~42 kA @ 440 V AC (IEC) • ~30 kA @ 500 V AC (IEC) • ~22 kA @ 525 V AC (IEC) • ~10 kA @ 660/690 V AC (IEC) • ~50 kA @ 480 V AC (UL) Rated Insulation Voltage (Ui) typically up to 800 V AC (NSX series typical) Rated Impulse Withstand Voltage (Uimp) ~8 kV (typical for NSX series) Suitability for Isolation Yes, conforms to EN/IEC 60947‑2 Mounting Fixed installation (panel/switchboard) Standards / Compliance IEC 60947‑2, UL where applicable Application Power distribution, feeder protection, industrial electrical systems