Its breaking capacity reaches 187 kA at 240 V AC, dropping to 121 kA at 415 V and 440 V, then to 79 kA at 500 V, and 3.4 kA at 690 V — so the interrupting rating is strongly voltage-dependent; at typical 400 V distribution panels it still holds 121 kA, which covers most industrial fault-current scenarios without needing an upstream current-limiting device.
Panel fit and thermal derating
The breaker is rated for 63 A from 40 °C through 50 °C ambient; above that it derates linearly to 53.55 A at 70 °C. If your enclosure runs hot (e.g., adjacent to drives or transformers), check the 55–70 °C column: at 55 °C it still delivers 60.6 A, but at 70 °C you lose nearly 10 A of headroom.