Siemens Rotary Actuator GLB141.9E Electromotive rotary actuators for open-close, three-position or modulating control. Used in heating, ventilation and air conditioning plants. USES OF GLB141.9E Suitable for use with modulating controllers (DC 0/2...10 V), open-close or three-position controllers. The gears are maintenance free and low noise Brushless, robust DC motors ensure reliable operation regardless of load. Download PDF Now