Siemens Rotary Actuator GCA121.1E Configurable damper actuator for adjusting dampers in technical building installations USES OF GCA121.1E For damper areas up to 3 m², friction-dependent For ventilation sections where the actuator must move to the zero position (emergency position) during power failure For dampers with two actuators mounted on the same damper shaft (tandem-mounted actuators or Powerpack) Download PDF Now