The Siemens SENTRON 3VA1163-5EF32-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, designed for line protection in industrial distribution panels. Its headline breaking capacity of 187 kA at 240 V means it can safely interrupt very high fault currents without upstream damage — critical for high-fault installations like transformer secondaries or large motor control centers. The breaker carries a full thermal derating curve: 63 A flat from 40 °C to 50 °C, then 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. For a panel running at 55 °C ambient, you lose only 1 A — negligible for most loads, but worth confirming if the circuit is already at 100% utilization. Rated insulation voltage is 800 V, and the breaker is fitted with a shunt trip (STL) release and two auxiliary switches (HQ). No undervoltage release or ground-fault monitoring is included — this is a straight line-protection device, not a feeder or equipment guard.
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a standard SENTRON 3VA1 footprint that mounts on DIN rail or panel-mount plate. The 76.2 mm width (3 inches) is the 3-pole form factor; verify panel cutout or busbar spacing against your existing MCCB layout. Power loss at rated current is 17.3 W maximum — that heat must be dissipated inside the enclosure. For a multi-breaker panel, sum the losses and check the thermal rise calculation; at 70 °C operating limit, ventilation or a larger enclosure may be needed.
The closest peer alternative is the 5SQ2370-2YA05 series. The 3VA1163-5EF32-0JC0 carries a higher interrupting rating (187 kA at 240 V vs the 5SQ's typical 65 kA class) and includes a shunt trip as standard. If your BOM was built around the 5SQ2370-2YA05, the 3VA1163-5EF32-0JC0 will not drop in without rewiring — the shunt trip wiring and auxiliary contact arrangement differ. Stick with the 3VA if you need the high-fault rating; the 5SQ is a lighter-duty economy alternative.