The Siemens SENTRON 3VA1063-2ED42-0KC0 is a 4-pole molded case circuit breaker rated for line protection duty, carrying 63 A continuously at 40 °C through 50 °C without derating. Above 55 °C the current tapers — 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, 56.7 A at 70 °C — so if your panel ambient runs hot, the continuous current you can actually pull is lower than the nameplate 63 A.
Breaking capacity across voltage levels
The interrupting rating drops as system voltage rises: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V.