Its interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V and 440 V, so it handles high-fault utility feeds without cascading upstream. The 400 A rating holds flat from 40 °C through 50 °C, then derates to 375 A at 55 °C and 300 A at 70 °C — that thermal curve matters when you pack this into a warm enclosure. It ships with a shunt trip (STL) auxiliary release and a 2+1+1 auxiliary switch configuration (2 auxiliary switches, 1 trip alarm, 1 electrical alarm).
The breaker measures 248 mm high by 138 mm wide by 110 mm deep. That 110 mm depth is the projection from the mounting surface — check your gland plate clearance if you're back-panel mounting in a shallow enclosure.