The Siemens SENTRON 3VA2063-5HN32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That's a clean 63 A at every point in the span, so the rating holds in a warm panel without recalculating. Interrupting capacity is 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. This is a line-protection design — meaning it's configured for incoming feeder or main distribution duty, not motor branch-circuit protection.
Maximum power loss is 7.9 W, which is low enough that ventilation slots in a standard IP54 enclosure handle the heat without forced cooling.