The Siemens SENTRON 3VA9267-0HC15 is a motorized operating mechanism with stored energy mechanism (SEO) designed for remote switching of 3VA2 molded case circuit breakers in the 100 A, 160 A, and 250 A frame sizes. It runs on 24 V DC control voltage and draws 300 VA operating apparent power to charge the spring mechanism, which then trips or closes the breaker on command. This is a panel-mount accessory that bolts onto the front of the 3VA2 breaker. The stored-energy design means the spring charges over roughly 0.08 s (make and break time typical) and releases independently of the control voltage — so even if the 24 V DC supply dips during closing, the mechanism still completes the stroke. That matters for applications where breaker position must be guaranteed regardless of control power quality.
The mechanism measures 105 mm wide, 118.7 mm high, and 162.8 mm deep. That depth includes the operator housing that protrudes forward from the breaker face — account for it in enclosure depth calculations, especially if the panel door has a cutout for the breaker rotary handle. The width matches the 3VA2 breaker front, so it does not increase the DIN-rail footprint. Stripped length for the control wiring is 7 mm — standard for screw-clamp terminals on this class of accessory. Strip to that length and no more; longer bare wire risks shorting against the mechanism housing.
Environmental range
The -40 °C floor covers cold storage or outdoor enclosures in northern climates; the 80 °C ceiling handles the heat rise inside a sealed panel near the breaker arc chamber. No derating curve is published for the stored-energy spring at temperature extremes, but the mechanism's mechanical nature means it is less thermally sensitive than electronic operators.