Description
The Schneider Electric (Barber Colman) MA40-7173 is a 24-volt, two-position, direct current (DC) powered damper actuator commonly used in HVAC equipment. It works by translating an electrical signal into mechanical action, which opens or closes dampers to regulate airflow in the entire system. “150 In-Lb” shows the torque the damper produces, which is 150 inch-pounds, while “2Pos” in the product code indicates the two positions (open or closed) the damper can be in. I believe “S/R DirMt” stands for “Spring Return, Direct Mount,” which indicates that the damper mounts directly onto the damper assembly and returns to a predetermined position (often closed) in the event of a power outage. In a variety of HVAC systems, such as air handling units, ventilation systems, and furnaces, these damper actuators are essential parts.
