The supplied basic switch variant is 3VA12255EF320AA0.
The interrupting ratings climb as voltage drops: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. If your transformer can push that much fault current, this breaker can stop it.
The 250 A rating holds steady up to 50 °C. Above that it derates: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C.
Power loss is 59.5 W max — account for that heat in the enclosure calc, especially if you're stacking breakers.