63 A motor protection breaker that takes the nacelle shake
The Siemens 3VA2163-7MN32-0JC0 is a SENTRON 3-pole molded case circuit breaker rated for 63 A continuous — and it holds that rating from 40 °C all the way up to 70 °C without derating, which matters when the breaker lives in a panel next to a hot drive or up-tower where summer solar gain pushes ambient past 50 °C. Interrupting capacity hits 330 kA at 240 V and still clears 187 kA at 500 V, so it handles the fault energy from a multi-megawatt transformer without welding contacts shut. This is a motor-protection design — it includes phase failure detection and a shunt trip release for remote emergency stop, plus two HQ auxiliary switches for status feedback to the PLC or SCADA. The basic switch variant is 3VA2163-7MN32-0AA0, so the -0JC0 suffix adds the shunt trip and aux contacts in a factory-integrated package that avoids field wiring errors.
DIN-rail footprint and panel fit
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — a standard 3-pole MCCB footprint that drops into the SENTRON panel infrastructure without re-drilling gland plates or re-spacing DIN rails. The 4 W maximum power loss at rated load means you can cluster breakers without cooking the enclosure, and the -25 °C to 70 °C operating range covers unheated electrical rooms and cold-weather turbine cabinets.