The Siemens SENTRON 3VA9877-0GX32 is an auxiliary switch module that adds two auxiliary contacts to 3VA57, 3VA58, 3VA59, 3VA67, 3VA68, and 3VA69 molded-case circuit breakers. It clips into the rotary operator accessory slot on those frames — no separate wiring channel needed, just snap it on and terminate the flying leads. Rated thermal current (Ith) is 5 A, which governs the continuous current the contacts can carry in any duty. Switching capacity varies by circuit type and voltage: 5 A in AC-12 (resistive loads) from 12 V up to 240 V; 2 A in AC-15 (solenoid/contactor coils) across the same voltage range; and 0.2 A in DC-13 (solenoid valves, contactor coils on DC) from 12 V up to 250 V. That DC-13 rating is the one to watch — if you're switching a 24 VDC pilot valve, the 0.2 A limit is the hard ceiling, not the 5 A thermal number.
Environmental and insulation ratings
That means it's suited for industrial control panels where dust, humidity, or condensation are present — not just clean conditioned rooms.
The 3VA9877-0GX32 carries an active lifecycle status from Siemens. It's a current-production accessory for the SENTRON 3VA series, not a last-time-buy or NRND item.