What it is and what it does
The Siemens SENTRON 3VA2163-5KP32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, designed for line protection in distribution panels. Its 187 kA breaking capacity at 240 V means it can safely interrupt a fault current up to that level without welding contacts or cascading failure upstream — a critical spec for high-fault-capacity service entrances or industrial sub-distribution. At 415 V it still holds 121 kA, dropping to 75.6 kA at 500 V and 3.7 kA at 690 V, so confirm your system voltage against the curve before specifying.
Ratings that matter for fit
The adjustable thermal-magnetic trip covers 95 A minimum to 756 A maximum — that range tells you the breaker ships with interchangeable rating plugs or an electronic trip unit, not a fixed bimetal. The 63 A continuous rating holds flat from 40 °C through 70 °C ambient, so no derating headache in a warm enclosure. Rated insulation voltage is 800 V, which covers 480/600 V class systems with margin. The shunt trip release (STL) is built in — that's the auxiliary release for remote tripping via a control signal, common in emergency-stop or fire-safety circuits. Communication function is present, so it can talk to a BMS or PLC over the SENTRON bus system for metering and status.
Panel fit and environment
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA2 frame size that mounts on a DIN rail or direct panel. Operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Power loss is 4 W maximum, negligible for enclosure thermal budgeting.