What it is and what it does
The Siemens SENTRON 3VA2163-6HN36-0HH0 is a 3-pole molded case circuit breaker designed for line protection — meaning it sits at the feeder or branch to protect cables and busbars from overcurrent and short-circuit faults, not motor overloads (that would need a separate overload relay or a motor-protective breaker). Rated 63 A continuous flat across 40 °C to 70 °C ambient — no derating headache in a warm panel. The frame is fixed at 756 A maximum and minimum (non-adjustable frame rating), so the breaker is sized for the 63 A trip unit it ships with. Interrupting capacity is the standout: 242 kA at 240 V, 187 kA at 415/440 V, 121 kA at 500 V, and 3.7 kA at 690 V. That 242 kA at 240 V covers high-fault utility feeds and transformer secondaries in North American panels. The steep drop to 3.7 kA at 690 V means this is not the breaker for 690 V high-fault applications — the 690 V rating is for low-fault downstream positions only.
Panel fit and wiring
Footprint: 105 mm wide, 181 mm tall, 86 mm deep — standard 3-pole MCCB width for a 63 A frame. Mounts on a DIN rail or direct panel-mount via the SENTRON base adapter. The 86 mm depth (3.39 in) means it clears most shallow gland-plate enclosures without a spacer. Power loss at rated current is 4 W maximum — negligible for thermal budgeting inside a sealed panel, but worth noting if you're packing multiple breakers in a small enclosure with no forced ventilation. Comes with a shunt trip release (STL) for remote tripping via a control signal, plus 2 auxiliary switches and 1 trip alarm switch (HQ) for status feedback to a PLC or indication lamp. The auxiliary switches share the same wiring space — plan for 4 additional control wires (2 for aux, 2 for alarm) plus the shunt trip coil wires.