The Siemens SENTRON 3VA9277-0HA20 is a motorized operating mechanism (MO) designed to remotely open and close 3VA molded case circuit breakers. It accepts a control supply voltage of 110-230 V AC (60 Hz) or 110-250 V DC, making it compatible with common industrial control voltages across different regions. The mechanism draws 250 VA of apparent power during operation, with a typical make and break time of 1 second each — fast enough for routine switching but not intended for high-speed protection duties.
Breaker compatibility and panel fit
This motor operator is specified for the 3VA6 150/250 and 3VA5 250 breaker frames. It mounts directly onto the breaker, so the panel footprint is determined by the breaker itself — the mechanism adds minimal depth beyond the breaker body. The 132 mm depth, 105 mm width, and 75 mm height are the mechanism's own dimensions; verify clearance inside the enclosure, particularly for the wiring space needed at the rear and sides.
Environmental range and wiring
The control terminals accept a stripped length of 7 mm — standard for most screw-clamp terminations on this class of accessory.