Parts & Accessories Spare parts GCA166.1E rotary air damper actuator AC/DC 24 V, DC 0 10 V, 18 Nm, Spring Return 90/15 S, 2 Auxiliary Switches GCA166.1E rotary air damper actuator, AC/DC 24 V, DC 0-10 V, 18 Nm torque, 90/15 S spring return, and 2 auxiliary switches.