The Siemens SENTRON 3VA2063-5HN32-0JL0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. Interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V — that 187 kA figure at 240 V covers high-fault transformer secondaries and large motor control centers without cascading upstream.
Max power loss is 5.4 W, so internal panel heat rise stays manageable even in a dense lineup of breakers.