ms4dSchneider Electric MS4D-8033-100 : Spring Return Damper Actuator (CW Spring), 30 in-lb Torque, 24 VACDC, 2MA4D-NNNN-NNN Two Position Series, MF4D-NNNN-NNN Floating Series, MS4D-NNNN-NNN Proportional Series, SmartX Actuators Rotary Overshaft Rotary over-shaft