What this MCCB is and what it does
The Siemens SENTRON 3VA2163-5MN32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated at 63 A continuous current, designed specifically for motor protection. It includes phase failure detection, so it will trip on loss of a phase — a common failure mode that can single-phase a motor and cause overheating. The interrupting capacity is 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA figure at 240 V means it can safely clear a fault up to that level without rupturing — important for high-fault-capacity installations like industrial distribution panels where available fault current is high.
Motor protection design and auxiliary switch complement
This MCCB is explicitly designed for motor protection, which means its trip curve is shaped to handle motor inrush without nuisance tripping while still protecting against overloads and short circuits. The auxiliary switch configuration is 2 auxiliary switches plus 1 trip alarm switch HQ — that gives you two independent status signals (e.g., open/closed) plus a separate alarm contact that activates only on a trip event, not on manual opening. That alarm contact is useful for remote fault annunciation in a PLC or SCADA system.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep. The 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size; it mounts on a DIN rail or can be screw-mounted to a backplate. The 86 mm depth leaves clearance for wiring and busbar connections in a typical 200 mm deep enclosure.
Thermal performance and power loss
The 63 A rating holds across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to 70 °C, which is unusual and simplifies panel design in warm environments. Maximum power loss is 4 W, so heat dissipation in the enclosure is low. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.