The Siemens SENTRON 3VA9267-0HA21 is a motorized operating mechanism (MO) — an accessory that lets you remotely open and close a 3VA2 molded-case circuit breaker. It's built for the 3VA2 100 A, 160 A, and 250 A frame sizes, and the control coil is wound for 110 V AC at both 50 Hz and 60 Hz, so it works on either line frequency without a changeout. The mechanism draws 250 VA of inrush power to throw the breaker, then holds in on the sealed coil. That 250 VA rating is what you size the control transformer for — it's the peak pull-in load, not the continuous hold.
Siemens specifically notes this version is optimized for long cable runs between the control source and the operator — useful when the breaker is in a remote panel and the pushbutton station is across the plant floor.