The MA-ESR is a two wire, round spring return motor actuator. The MA-ESR is normally
used on the Model ND and URD dampers. The motors can be wired in parallel off of 1
40VA transformer. One 24V 40VA transformer can power up to 5 dampers. A built in
auxillary switch can be used to interlock various field components. The switch is rated for
24VAC only