The Siemens SENTRON 3VA2163-6HN32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C up to 70 °C — no derating needed in a warm enclosure. It carries a 242 kA interrupting rating at 240 V, stepping down to 187 kA at 415/440 V, 121 kA at 500 V, and 3.7 kA at 690 V.
At 690 V the interrupting capacity drops to 3.7 kA, so this breaker is not the right choice for 690 V line-side protection unless the available fault current is well below that figure.
Footprint is 105 mm wide by 181 mm tall by 86 mm deep — that is 4.13 in × 7.13 in × 3.39 in. The 3-pole block takes up the same width as a typical 3-pole frame in this class; plan the enclosure layout with the 105 mm width in mind for busbar and cable entry clearance.