The Siemens SENTRON 3VA2163-6HN36-0BL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full operating temperature range of -25 °C to 70 °C, with no derating needed from 40 °C up to 70 °C. That means it holds its full 63 A rating in a warm cabinet — a practical advantage when the panel's internal ambient runs high. Interrupting capacity is the headline here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. At 690 V the drop to 3.7 kA tells you this is not a 690 V workhorse; it's optimized for the 240–500 V range where the interrupting numbers are substantial. The basic switch is order code 3VA2163-6HN36-0AA0, so if you're replacing that base unit, this is the drop-in with the UVR and alarm contacts already populated.
The 105 mm width is a 3-pole frame size; check your DIN-rail or mounting-plate layout against that width before committing.
What it's designed to protect
Product designation is line protection — this is a feeder or main breaker for protecting cable and bus, not a motor-protective device. The trip indicator is present, and there is no ground-fault monitoring version. If you need GF protection, this is not the variant; look at the 3VA2 with ground-fault option.