It is the motor protection version, fitted with an ETU350M electronic overcurrent release. The 400 A rating holds across ambient temperatures up to 50 °C; above that it derates to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C — so if your panel runs hot, the continuous current you can actually pull is lower than the nameplate 400 A. Breaking capacity is 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. It includes phase failure detection, a trip indicator, and a voltage trigger. A shunt trip (STL) is integrated as the auxiliary release.
The shunt trip (STL) allows remote tripping from a PLC or emergency-stop circuit. The auxiliary switches and trip alarm switch give status feedback to a control system or HMI.