The Siemens SENTRON 3VA2163-7MS32-0CA0 is a 3-pole molded case circuit breaker (MCCB) in the starter protection product version, rated for a continuous current Iu of 63 A at 40 °C and carrying a rated insulation voltage Ui of 800 V. At 240 V it interrupts 330 kA; at 415 V and 440 V, 242 kA; at 500 V, 187 kA; and at 690 V, 52.5 kA. Those figures are symmetrical RMS — the values a coordination study needs to confirm selectivity with upstream and downstream devices. The overcurrent release is an ETU310M electronic trip unit — that is a microprocessor-based, LSI (long-time, short-time, instantaneous) curve with adjustable pickups and time delays. It gives you the selectivity granularity a thermal-magnetic cannot: you can shape the short-time band to ride through motor inrush and still clear a bolted fault downstream.
At 55 °C it derates to 60.48 A; at 60 °C, 59.22 A; at 65 °C, 57.96 A; at 70 °C, 56.7 A. Power loss at full rated current is 75 W, which contributes to the enclosure's internal temperature rise and must be factored into the thermal budget.
Panel fit and mechanical endurance
For a motor-starting application cycling several times a shift, that is a finite but serviceable life; for an infrequently operated feeder, it is effectively permanent.