What this MCCB is and what it does
The Siemens 3VA2163-7MN32-0BC0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection. It carries a continuous current rating of 63 A across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel sizing in warm enclosures. Three poles, with an interrupting capacity that starts at 330 kA at 240 V and drops to 3.7 kA at 690 V. That 330 kA at 240 V is a monster number — it tells you this breaker is built for high-fault-capacity industrial distribution, not light commercial. The 3.7 kA at 690 V is the real-world ceiling for a 63 A frame on a 690 V line. It ships with an undervoltage release (UVR) and two HQ auxiliary switches built in, plus phase failure detection as standard. The UVR means the breaker trips if control voltage drops — common in E-stop strings or safety circuits where you want the motor dropped on loss of control power.
Panel fit and dimensions
Footprint is 105 mm wide by 181 mm tall by 86 mm deep — a standard 3-pole MCCB frame. Power loss is 6.5 W maximum at rated current. That's low enough that you don't need forced ventilation in a typical IP54 steel enclosure, but if you're stacking several of these side by side, keep the 6.5 W per unit in your thermal budget.