The Siemens 3VA9447-0HA10 is a SENTRON motorized operating mechanism (MO) — a panel-mount accessory that provides remote electrical charging and closing of 3VA5 and 3VA6 molded-case circuit breakers in the 400 A and 600 A frame sizes. It accepts a control voltage from 24 V to 60 V DC, drawing 250 VA apparent power during the operating cycle. The mechanism's make time is typically 1.7 s and break time 1.3 s, which means the breaker closes or opens within about two seconds of the control signal — fast enough for routine remote switching but not intended for arc-flash mitigation or high-speed protection coordination; that's the breaker's own trip unit.
The MO occupies a footprint of 138 mm wide by 92 mm tall by 149 mm deep. Stripped length for the control wiring is 7 mm, standard for a spring-cage or screw terminal on the accessory interface.