400 A MCCB with shunt trip — line protection for high-fault panels
Interrupting capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — so at typical 400 V class distribution voltages it clears fault currents up to 121 kA without cascading upstream breakers. Thermal derating is minimal up to 50 °C (full 400 A), then drops to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. That means in a warm panel — say 55 °C ambient — you lose 25 A of headroom; plan the load accordingly.
Maximum power loss is 96 W — that's the heat to vent in an enclosed panel. The breaker includes a voltage trigger for undervoltage or overvoltage sensing, but no undervoltage release is fitted as standard.