The C40F44V400 is a Schneider Electric ComPacT NSX400F molded case circuit breaker rated 400 A at 40 °C, with a 4-pole configuration and an electronic MicroLogic 4.3 trip unit. At 415 V AC it still holds 36 kA Icu, so it handles common industrial service voltages with headroom. The integrated earth-leakage protection (R function) means you don't need a separate RCD module; the trip unit handles overload (L), short-time short-circuit (So), instantaneous (I), and ground-fault all in one package.
The 185 mm width and 255 mm height fit standard MCCB cutouts; the 110 mm depth leaves room for cable bending.
Protection and trip unit detail
The trip unit rating is 400 A at 40 °C; above that ambient, derating applies per the thermal curve. The green flashing LED indicates ready to operate; red at 105% Ir signals overload, orange at 90% Ir gives pre-alarm.
Overvoltage category IV and pollution degree 3 cover direct utility connection and harsh industrial environments. IP40 enclosure protection (IEC 60529) keeps tools and fingers out; IK07 (IEC 62262) resists impact energy of 2 J. The 50/60 Hz network frequency is standard for global installations.