Rating and fit
The Siemens 3VA1163-4ED26-0AA0 is a SENTRON molded case circuit breaker (MCCB) for line protection, rated 63 A continuous at 40 °C ambient with a 2-pole configuration and a TM210 thermal-magnetic overcurrent release. Breaking capacity is 121 kA at 240 V AC and 75.6 kA at 415 V AC — figures that govern fault-interruption capability for the installed service voltage. The thermal derating curve holds 63 A flat through 50 °C, then drops by 1 A per 5 °C step to 58 A at 70 °C; per the datasheet, that's the continuous-current limit under panel ambient, not the trip threshold.
Dimensions are 70 mm deep by 50.8 mm wide by 130 mm high — the 50.8 mm width (2 inches) is the standard MCCB pole pitch for a 2-pole unit, so it occupies the same DIN-rail footprint as other 2-pole SENTRON breakers. Maximum power loss is 11.54 W — a figure to account for in enclosure thermal calculations when multiple breakers are ganged.