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. This breaker carries a communication function and a trip indicator, plus provisions for an undervoltage release and auxiliary switches — two auxiliary switches plus one trip alarm switch. That makes it suitable for monitored, networked distribution where you need remote status and controlled shutdown capability.
Dimensions and panel fit
The case measures 86 mm deep, 105 mm wide, and 181 mm tall. That 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — it occupies three adjacent 35 mm DIN-rail positions or bolts directly to a mounting plate. Verify the gland plate knockout pattern against your enclosure; the depth leaves clearance for rear-connected busbars or cable lugs.
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. The auxiliary switch configuration includes two auxiliary switches plus one trip alarm switch (HQ type). 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.