What it is and what it does
The SENTRON 3VA2163-7MS32-0KH0 is a 3-pole molded case circuit breaker (MCCB) designed specifically for starter protection — meaning it's built to sit ahead of a motor contactor and protect the motor branch circuit against short circuits and overloads, not just general distribution. It carries 63 A continuous at ambient temperatures from 40 °C all the way up to 70 °C with no derating, which is unusual and useful for a warm panel. The adjustable trip range spans 189 A to 945 A, so you set the magnetic pickup to match the motor's inrush without nuisance tripping. Interrupting capacity is voltage-dependent: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA figure at 240 V tells you this breaker is sized for high-fault industrial panels where the available short-circuit current is serious — think large transformer secondaries or generator paralleling. The steep drop to 3.7 kA at 690 V means it's not a 690 V main; at that voltage it's a downstream feeder breaker.
Built-in accessories and wiring
This variant ships with a shunt trip (STL) as the auxiliary release, plus two auxiliary switches and one trip alarm switch (HQ configuration). That means you can remotely trip the breaker via a control signal — useful for emergency-stop circuits or PLC-based shutdown sequences — and get status feedback (open/closed/tripped) back to the controller. No undervoltage release, no ground-fault monitoring, no communication module on this build. The basic switch assembly is order code 3VA2163-7MS32-0AA0, which is the interchangeable switching mechanism inside the molded case. If the switch mechanism fails but the case and terminals are intact, you can swap that subassembly rather than replace the whole breaker. Panel footprint: 105 mm wide, 181 mm tall, 86 mm deep — standard 3-pole MCCB spacing for DIN-rail or panel-mount backpanels.
What the ratings mean for your panel
The 63 A continuous rating at 70 °C ambient is the number that governs real-world panel loading. Many breakers derate above 40 °C; this one holds full rating through 70 °C, so you can pack it into a hot enclosure without oversizing the frame. The 189-945 A adjustable magnetic trip range lets you dial the instantaneous pickup to just above the motor's locked-rotor current — typically 6-8x FLA for a standard induction motor — so the breaker clears a bolted fault without tripping on startup inrush. Power loss is 4 W maximum at rated current — negligible for panel thermal budgeting, but worth noting if you're stacking multiple breakers in a sealed enclosure. The shunt trip coil draw is not listed here, but typical STL coils pull about 10-20 VA during the trip pulse; factor that into your control transformer sizing.