It carries a breaking capacity of 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V — so the interrupting rating drops significantly as voltage climbs; at 690 V it's still 11.9 kA, which covers most industrial distribution faults.
Thermal derating
Rated current holds at 63 A from 40 °C through 50 °C, then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C (–).
