What this MCCB does on a motor circuit
The Siemens SENTRON 3VA2163-7MQ32-0AA0 is a 3-pole molded case circuit breaker rated 63 A continuous current, designed specifically for motor protection. It carries a full-scale value of 63 A and an initial trip threshold of 13 A, meaning it can be set to protect a motor branch circuit within that window. The breaker includes phase failure detection and ground-fault monitoring via summation current formation on the L-conductor — both essential for three-phase motor applications where an open phase or leakage to ground can burn out a winding before the overload relay notices. Breaking capacity is the headline number that decides whether this breaker clears a fault without exploding. At 240 V it interrupts 330 kA; at 415 V and 440 V it holds 242 kA; at 500 V it drops to 187 kA; at 690 V it is rated 3.7 kA. That 330 kA at 240 V is exceptionally high — it means this breaker can be placed at the main service entrance of a large industrial facility where available fault current is massive, not just on a downstream feeder. The steep drop at 690 V (3.7 kA) tells you this is not a 690 V main breaker; it belongs on a 400–500 V distribution bus.
Motor protection logic and communication
This MCCB has a communication function and an other measurement function via the SENTRON communication module. Ground-fault monitoring uses summation current formation on the L-conductor. No undervoltage release is fitted. The breaker is rated 63 A across the entire operating temperature range from 40 °C to 70 °C — no derating needed. That is unusual for a molded case breaker; most have to be downsized above 40 °C. If your panel runs hot near the motor starter, this one holds its full rating. Power loss is 4 W maximum, which is low enough that ventilation around the breaker is not critical in a typical enclosure.
Physical fit and storage
Dimensions are 181 mm high, 105 mm wide, 86 mm deep. That 105 mm width is standard for a 3-pole MCCB in the SENTRON 3VA frame — it fits the same panel cutout as other 3VA2 breakers. Storage temperature range is -40 °C to 80 °C; operating range is -25 °C to 70 °C. The storage minimum of -40 °C matters if this breaker sits in an unheated warehouse in a cold climate — it will survive the winter without damage.