The Siemens SENTRON 3VA2163-7MN32-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C up to 70 °C — no derating needed as the panel warms. This makes it a solid choice for a motor protection circuit in a crowded enclosure where heat buildup is a given. Breaking capacity hits 330 kA at 240 V and still delivers 242 kA at 415/440 V, dropping to 187 kA at 500 V. At 690 V it manages 3.7 kA — enough for the high-voltage tail but not the primary interrupt rating.
Motor Protection and Auxiliary Hardware
This MCCB is explicitly designed for motor protection, with phase failure detection built in. That means it will trip on a lost phase before the motor single-phases and cooks the winding — a common failure mode in older plants where a fuse blows and nobody catches it until the smoke appears. That is a standard safety requirement on motor feeders in many jurisdictions — no separate UVR module to buy and install. Two HQ auxiliary switches are also integrated, giving you status feedback for the PLC or a remote annunciator without adding external contact blocks.
Power dissipation is 6.5 W max at rated load, so thermal rise in the enclosure is manageable. No forced cooling required unless the panel is already dense with other heat sources.