What this 3VA1 breaker is and what it does
The Siemens 3VA1110-5MH32-0AB0 is a 3-pole molded-case circuit breaker from the 3VA1 IEC frame 160 family, rated at 100 A continuous current. Its headline number is the 55 kA breaking capacity at 415 V (class M) — that means it can safely interrupt a fault current up to 55,000 amps at that voltage without welding its contacts or rupturing the case. That's the kind of fault-clearing headroom you want on a motor branch circuit fed from a large transformer or a busway tap, where the available short-circuit current is high. The breaker includes a TM120M thermal-magnetic trip unit configured for starter protection (motor starting inrush won't nuisance-trip it), with an adjustable magnetic short-circuit pickup from 5 to 15 times In (500 A to 1500 A). It ships with a nut keeper kit and two HP auxiliary switches for remote status feedback.
Where you'd land this in a panel
The 3VA1 frame 160 mounts on a DIN rail or can be screw-fixed to a backplate in a standard IEC distribution panel. At 100 A with a 55 kA SCCR, it's sized for motor control center feeders, large pump or compressor branch circuits, or as the main disconnect on a sub-panel fed from a high-capacity bus. The two HP auxiliary switches let the PLC or DCS see the breaker's open/closed and tripped status without running separate control wiring back to the breaker handle.