The Siemens 3VA1163-6MH32-0KH0 is a 3-pole IEC frame 160 circuit breaker rated 63 A continuous, with a breaking capacity of 70 kA at 415 V AC — class H on the 3VA1 platform. That 70 kA figure means it can safely interrupt a fault current up to that level without upstream devices needing to coordinate, which is what you want when the fault current at the panel is known to be high. It's configured for motor starter protection (TM120M thermal-magnetic release, AM) providing short-circuit protection only — no overload function in this build, so the motor starter's own overload relay handles that job. The adjustable short-circuit pickup range is 5 to 15 times In (315 A to 945 A).
What's on the breaker
Factory-fitted accessories include a shunt trip (STL) rated for 220–250 V DC or 208–277 V AC, two auxiliary switches (HQ), and one trip alarm switch (HQ). A nut keeper kit is also included — that's the hardware that prevents the mounting nuts from backing off under vibration, a detail that matters on a motor circuit in a pump house or compressor skid. The shunt trip lets you remotely trip the breaker from an E-stop or PLC digital output, and the alarm switch signals when the breaker has tripped on fault.