Its 3-pole design handles three-phase systems up to 690 V, with interrupting capacity that drops from 187 kA at 240 V to 121 kA at 415 V and 7.5 kA at 690 V. The 400 A continuous rating holds through 50 °C (–); above that it derates to 385 A at 55 °C and 340 A at 70 °C, which matters if you are packing it into a warm enclosure without forced cooling.
The 110 mm depth clears most 200 mm-deep enclosures with room for rear-connected busbars. Maximum power loss is 96 W at full rated current; factor that into your thermal budget if the breaker is enclosed with other heat sources. If you need those options, you step up to a different variant in the 3VA2 family.