The Siemens 3VA1112-5ED32-0AE0 is a 3-pole IEC molded-case circuit breaker on a 160 A frame, rated for 55 kA breaking capacity at 415 V (class M). It carries fixed overload protection set at 125 A (Ir) and fixed short-circuit protection at 10 times In (Ii = 1250 A).
The fixed Ir and Ii settings simplify specification: no adjustment range to manage, but also no field tuning. For selectivity coordination downstream, the 10x In instantaneous pickup (Ii) means the breaker clears hard faults fast, which can limit let-through energy for downstream devices.
The four auxiliary switches (HQ) provide status feedback for the main contacts and the trip mechanism — useful for PLC inputs or alarm annunciation. The nut keeper kit retains the terminal screws during wiring, a small but practical detail for panel builders working in tight enclosures.