The Siemens SENTRON 3VA2163-5MN32-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous at 40 °C, built for motor protection duty with an ETU350M electronic trip unit. It carries a 187 kA interrupting capacity at 240 V AC, stepping down to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — numbers that matter when you're coordinating with upstream gear in a high-fault panel. This is a motor-protection MCCB, so it includes phase-failure detection and a voltage-trigger function. The shunt-trip release (STL) design lets you remotely open the breaker, and the integrated auxiliary trip is the 3VA9688-0BL32.
Thermal derating and endurance
Above that, it derates: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. Max power loss through the breaker is 75 W.