What this MCCB is and where it fits
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. The ETU850 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves, so you can coordinate it with downstream breakers without pulling out a screwdriver to swap thermal elements.
Interrupting capacity — what the numbers mean on your line
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. That 187 kA figure at 240 V tells you it's sized for high-fault utility feeds or transformer secondaries where the available short-circuit current is massive. 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. The drop to 3 kA at 690 V is a reminder that this is a 690 V rated breaker, but you need to check your available fault current at that voltage before committing it to a 690 V bus.
Panel fit and integration
Dimensions are 86 mm deep, 140 mm wide, 181 mm tall. 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.