Interrupting capacity and derating
At 415 V the interrupting rating drops to 121 kA, at 440 V to 75.6 kA, and at 500 V and 690 V it holds at 17 kA. That's typical for a compact MCCB — the arc extinction gets harder as voltage climbs, so the rating steps down. The continuous current derates from 125 A at 40 °C to 114 A at 70 °C; at 70 °C ambient you lose about 9 % of the rated ampacity.
Panel fit and physical integration
Power loss and thermal budget
Maximum power loss is 28.1 W at rated current. That's the heat the breaker dumps into the enclosure at full load. For a panel with multiple breakers ganged together, sum the losses and check the cabinet's dissipation capacity — 28 W per pole group adds up fast in a dense distribution board.