It carries a continuous current of 400 A at 40 °C through three poles, with a maximum breaking capacity of 242 kA at 240 V and 187 kA at 415 V — figures that tell you it will clear a bolted fault on a large transformer secondary without the arc re-striking or the case rupturing.
Ratings that matter in the panel
Continuous current holds at 400 A from 40 °C up to 50 °C, then derates to 375 A at 55 °C and 300 A at 70 °C — so if the panel ambient runs above 50 °C, you need to account for the drop in the load schedule. The 3-pole design handles three-phase circuits, and the 110 mm depth fits standard MCCB mounting footprints in most switchboards. Breaking capacity steps down with voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. Power loss is 96 W maximum at rated current, which adds to the panel heat load.
A communication function is built in, so it can report status to a BMS or PLC without an add-on module.