What this MCCB is and what it protects
The Siemens 3VA2163-5MN32-0AF0 is a SENTRON molded case circuit breaker (MCCB) built specifically for motor protection duty — three poles, 63 A continuous current, and an ETU350M electronic trip unit that includes phase failure detection. That phase-failure logic is the difference between a motor that coasts to a stop on a lost leg and one that cooks the winding while still spinning.
Breaking capacity — what the numbers mean for your fault level
Rated 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — those are the maximum fault currents this MCCB can safely interrupt at each voltage level. On a 480 V panel with a 65 kA available fault current, this breaker has headroom to spare; at 690 V you need to confirm the 17 kA rating covers your installation's prospective short-circuit current.
Thermal derating — still 63 A up to 50 °C
The breaker carries its full 63 A rating from 40 °C through 50 °C. Above that it starts to taper: 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. If your panel runs hot — say inside a non-ventilated enclosure next to drives — the 55 °C figure is the one to size against.
Mounting and integration
Bolts into a standard MCCB footprint: 181 mm tall, 105 mm wide, 86 mm deep. The auxiliary contact block (1 auxiliary switch + 1 trip alarm switch HQ) is included as standard — no separate add-on needed for basic status feedback to the PLC. Max power loss is 75 W, so account for that heat in your enclosure thermal calculation.