The Schneider Electric (Erie) AT23A00T is a 3-wire spring-return actuator designed to deliver reliable 24V control for HVAC damper and valve applications. It uses an electric drive with automatic spring return to position dampers accurately and ensure fail-safe operation during power loss. https://www.partshnc.com/at23a00t-schneider-electric-erie-24vno-sr-3wire-wtimeout