63 A MCCB with line protection focus and communication option
The Siemens SENTRON 3VA2063-5KP32-0BH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across its full ambient range — 40 °C through 70 °C, no derating needed. It's designed for line protection duty, meaning it protects feeders and distribution circuits rather than specific motor or generator loads. The interrupting ratings climb to 187 kA at 240 V and hold at 121 kA through 415–440 V, then drop to 75.6 kA at 500 V and 3 kA at 690 V — so it's built for high-fault-capacity distribution panels, not light branch circuits. That makes it suitable for monitored, networked distribution where you need remote status and controlled shutdown capability.
Undervoltage release and auxiliary wiring
The breaker is equipped for an undervoltage release (UVR) — when line voltage drops below the release threshold, it trips the breaker, which is standard for emergency-stop chains or undervoltage protection schemes. That gives you two independent status signals (open/closed) plus a dedicated alarm contact that changes state only on a fault trip, not on manual switching. Wire the trip alarm into the PLC or annunciator for immediate fault notification.
Power loss and thermal budget
Maximum power loss is 7.9 W at rated current. In a densely packed panel, that heat needs to be considered for the enclosure's thermal budget — it's low enough for most standard cabinets but worth checking if the breaker sits next to heat-sensitive electronics or in a sealed, unventilated box.