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NSX400N 3P 250A

The Schneider Electric Compact NSX400N 3‑Pole 250 A is a molded case circuit breaker (MCCB) designed for electrical distribution and industrial power protection. It belongs to Schneider’s ComPacT NSX400N series, which delivers robust performance for low‑voltage systems requiring reliable overload, short‑circuit, and fault protection.

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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