Schneider Electric C40N31M320 ComPacT NSX400N 3P 320 A 50 kA MicroLogic 1.3 M Moulded Case Circuit Breaker

The C40N31M320 is a Schneider Electric ComPacT NSX400N 3-pole moulded case circuit breaker for motor-circuit protection, rated 320 A at 65 °C with a 50 kA breaking capacity (Icu) at 380/415 V AC. Its MicroLogic 1.3 M trip unit gives fixed instantaneous and adjustable short-time protection only, for pairing with a separate overload relay.

Technical Specifications

Certifications & Standards

• EN/IEC 60947-2

Selection Notes

The MicroLogic 1.3 M trip unit provides only short-time (S) and fixed instantaneous (I) protection — it has no adjustable long-time stage, so C40N31M320 is meant to pair with a separate motor overload relay or thermal-magnetic starter rather than protect the motor on its own. Use a 2.3 M variant of the same frame instead when a single device needs to combine adjustable overload protection with the motor-circuit breaker function. At 50 kA Icu at 380/415 V AC, the frame covers starter coordination up to that fault level.