The Honeywell MS8105A1130 On/Off Spring Return Direct Coupled Actuator with Auxiliary Switch is a reliable HVAC control device designed to regulate damper operation. It converts electrical input into precise rotary motion to open or close dampers, while the spring return ensures a safe default position during power loss. https://www.partshnc.com/44dca-onoffwauxsw-sr-45sec-2