The Siemens SENTRON 3VA9477-0GX20 is an auxiliary switch module with a rotary operator mechanism, designed as an accessory for 3VA5 (250/400/600 A frames) and 3VA6 (150/250/400/600 A frames) molded-case circuit breakers. It provides two contacts that lead to the ON position and one contact that leads to the OFF position, giving the panel builder a clean way to signal breaker status back to a PLC or indicator lamp without adding a separate interposing relay. Rated thermal current is 5 A, and the switching capacity is defined across three utilization categories that matter for different load types: AC-12 (resistive loads and solid-state inputs) carries the full 5 A at 12 V through 240 V AC; AC-15 (inductive loads like contactor coils) is rated 2 A across the same voltage range; and DC-13 (solenoid valves and DC contactors) is rated 0.2 A at 12 V through 250 V DC. That 0.2 A DC limit is the one that catches people out — if you're switching a DC coil that pulls 300 mA, this contact won't hold up under DC break.
The module measures 88.5 mm wide by 41.85 mm tall by 70 mm deep. It mounts directly onto the 3VA breaker's rotary operator mechanism — no separate DIN-rail footprint, no extra wiring trough. The 70 mm depth sits flush with the breaker body, so it doesn't push the panel door out.