Siemens Industry, Inc. GMA126.1U Open Air Actuator

OpenAir GMA126.1U is a spring-return rotary damper actuator from Siemens Industry, designed to drive HVAC dampers between two fixed positions with a robust 62 in-lb (7 Nm) of torque. It supports 24 V AC/DC operation and 120 V control options, enabling flexible installation for both low-voltage and line-voltage control schemes, and it uses direct-coupled electronic actuation with a 90-second travel time between end positions in 2-position control. The unit includes built-in spring return, so the damper returns to its default position when power is removed, and it provides dual auxiliary switches for end-of-travel or status signaling. Cables are included as standard, and the enclosure is NEMA 1 for indoor installations. As part of the OpenAir series, the GMA126.1U is commonly used on air-handling units, rooftop units, and other ventilation applications where reliable fail-safe damper positioning is essential in 24 V or 120 V control configurations.