What this 3VA1 frame 160 MCCB carries
The Siemens 3VA1163-5MH32-0DH0 is a 3-pole IEC frame 160 molded case circuit breaker with a 63 A thermal-magnetic trip unit (TM120M) and a 55 kA interrupting capacity at 415 V AC — class M breaking capacity, meaning it handles high fault currents typical of industrial distribution without cascading upstream. This variant is configured for starter protection: the TM120M trip provides short-circuit protection only (Ii adjustable 5–15 x In), with no overload protection element — the motor starter's own overload relay handles that.
The nut keeper kit secures the breaker in the enclosure without loose hardware — saves time during panel build-out. The UVR coil draws from a 208–230 V AC control transformer; verify the control circuit is separately protected. Auxiliary switches HQ and the trip alarm switch share the same terminal layout — wire per the Siemens wiring diagram for the 3VA1 family.