The Siemens SENTRON 3VA1063-3ED36-0BC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) at 40 °C, with a TM210 thermal-magnetic overcurrent release. It carries a breaking capacity of 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V — numbers that tell you this breaker handles high-fault industrial feeders, not just branch circuits.
The auxiliary contacts (2 HQ switches) are factory-fitted, saving a wiring step during assembly.
Compared to the 3VA1010-4ED36-0CC0 (a 100 A frame, 4-pole, with electronic release), this 3VA1063-3ED36-0BC0 is a 63 A, 3-pole thermal-magnetic unit. The frame size is smaller, the poles are fewer, and the release is simpler — no electronic adjustment, no ground-fault module. If your panel was laid out for the 100 A frame, the 63 A unit will physically fit the same mounting pattern, but the busbar tap and cable lugs must match the 63 A rating. The undervoltage release and auxiliary switch wiring are identical between the two; no rewiring of the control circuit needed.