The Siemens SENTRON 3VA2063-5KP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed up to 70 °C. It's built for line protection, meaning it sits at the feeder or main distribution point in a panel, not downstream on a specific load.
This breaker can clear 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. At 415/440 V — common three-phase distribution voltages in much of the world — the 121 kA rating still gives serious headroom for most industrial services.
That 140 mm width on a 4-pole breaker is compact — it'll fit a standard MCCB slot in most switchboards without eating extra cubicles. The IP40 protection on the front means it's fine in a clean indoor panel; no special gasketing needed for the enclosure door. It also carries a communication function (the ETU850 supports Modbus RTU via the SENTRON 3VA communication modules), so you can pull trip data and power metering into your BMS or SCADA without adding a separate power monitor.