What this auxiliary switch does in the panel
The Siemens SENTRON 3VA9877-0GX41 is a 1-pole auxiliary switch module that mounts onto 3VA57, 3VA58, 3VA59, 3VA67, 3VA68, and 3VA69 molded case circuit breakers to signal the breaker's ON/OFF position back to a PLC or indicator lamp. Rated 5 A thermal current (Ith), it handles AC-12 loads up to 5 A at 240 V and AC-15 pilot-duty loads up to 2 A at 240 V — sufficient for most contactor coils and panel indicators in a 480 V MCC lineup. On DC control circuits, the DC-13 rating is 0.2 A at 24 V and 0.2 A at 250 V, so it handles solenoid valves and small DC relays but not high-inrush DC loads like large contactor holding coils without a suppression network.