The Siemens SENTRON 3VA1063-2ED32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, using a TM210 thermal-magnetic overcurrent release — that's a fixed thermal trip with a magnetic short-circuit pickup adjustable to 10x the rated current. It's designed for line protection (cable and distribution feeder duty), not motor or generator protection. Breaking capacity is the headline here: 52.5 kA at 240 V AC, dropping to 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. The 7.5 kA at 690 V is still respectable for industrial 690 V grids where transformer impedance usually keeps fault current under 10 kA. Thermal derating is flat from 40 °C to 50 °C — still 63 A — then drops 1 A per 5 °C step to 58 A at 70 °C. That means in a crowded panel at 55 °C ambient you lose 1 A; at 65 °C you lose 3 A.
Maximum power loss is 17.3 W at rated current. That's moderate for a 63 A MCCB — expect some heat in a sealed panel, but within the derating curve above.