What this MCCB is and what it does
The Siemens 3VA2163-7HN32-0HA0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. It is a 3-pole unit designed for line protection, meaning it sits at the feeder or branch circuit entry point in a distribution panel, not on a specific motor or load. The interrupting capacity is 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 3.7 kA at 690 V, so it handles high-fault utility feeds without cascading upstream. This variant includes a shunt trip release (STL) — a separate control voltage triggers the breaker to open remotely, which is standard for emergency-stop circuits or interlocking schemes. There is no undervoltage release, no ground-fault monitoring, and no auxiliary switch fitted. The basic switch core is order code 3VA2163-7HN32-0AA0; the -0HA0 suffix adds the shunt trip module.
Panel fit and mounting
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep. That 105 mm width is a standard 3-pole MCCB footprint for this current class — it occupies three 35 mm DIN-rail modules (roughly 105 mm) in a distribution board. The 86 mm depth means it clears most standard enclosure gland plates and backpanels without a sub-panel extension. Mounts via the rear DIN rail clip or optional screw-mount lugs. Maximum power loss is 4 W at rated current, so thermal rise inside a sealed enclosure is modest — no forced ventilation required for a single unit, but group multiple breakers and check the cumulative heat budget against the enclosure's dissipation rating.