What this MCCB is and what it does
The Siemens SENTRON 3VA2163-7MN32-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current of 63 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed specifically for motor protection, meaning its trip curve is shaped to handle motor inrush without nuisance tripping while still clearing a locked-rotor or phase-loss fault. The breaker carries a shunt trip release (STL) for remote emergency-off or safety-circuit integration, plus two HQ auxiliary switches for status feedback to a PLC or annunciator panel.
Breaking capacity — what the numbers mean for coordination
This MCCB delivers 330 kA interrupting capacity at 240 V AC, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V is typical for a compact-frame breaker; at that voltage the arc extinction limits the rating, so if your system is 690 V you need to verify the available fault current stays under 3.7 kA. At the common 415 V distribution level, 242 kA gives generous headroom for most industrial secondary substations — selectivity with upstream fuses or a larger-frame MCCB is straightforward.
Motor protection features and auxiliary hardware
Phase failure detection is built in — the breaker trips on loss of any phase, which is the most common cause of motor burn-up on lightly loaded conveyors and pumps. The design includes a shunt trip release (STL) that can be energized from a safety relay or E-stop circuit; it is a separate voltage-triggered coil, so verify the control voltage matches your panel supply. Two HQ auxiliary switches are factory-fitted, giving you one N/O and one N/C contact for status indication. The basic switch assembly is orderable separately as 3VA2163-7MN32-0AA0 if you ever need a replacement core.
Dimensions and panel fit
The breaker occupies 105 mm width, 181 mm height, and 86 mm depth — a standard compact MCCB footprint for 63 A three-pole units. It mounts via screw terminals to a backplate or DIN rail adapter (not included). The 86 mm depth leaves room for rear-connected busbars or a cable duct behind the panel door.