Siemens Air Damper Actuator SUA21/3 The actuator opens the valve electrically. It incorporates an electric motor and gear mechanism. Technical Data Sheet Operating voltage: AC 230 V, 2-position control signal Positioning force: 170 N Direct mounting with M30 × 1.5 union nut (no tools required) 3-wire connection with integral 0.8 m connecting cable LED indication of actuator motion Parallel connection of multiple actuators possible Download PDF Now