MSxx20F 175 lb-in. Fire and Smoke Damper Actuators

The MS4120F, MS4620F, MS8120F Fast-Acting, Two-Position Actuators are spring return direct coupled actuators (DCA) for on/off damper control. The actuator accepts an on/off signal from a single-pole, single-throw (spst) controller. Reversible mounting allows actuator to be used for either clockwise (cw) or counterclockwise (ccw) spring rotation.

• 175 lb-in. (20 Nm) minimum driving torque at 350°F (176°C)
• Reversible mounting facilitates use in either clockwise (cw) or counterclockwise (ccw) spring rotation
• Integral spring return ensures level of return torque
• Stainless steel internal spring
• Fifteen-second spring return timing
• No special cycling required during long-term holding
• No audible noise during holding
• Models available for 24, 120, and 230 Vac applications
• Ninety-five degree angle of rotation
• Actuator holds rated torque at reduced power level
• Die-cast aluminum housing
• Housing design allows flush mounting to damper
• Patented Self-Centering Shaft Adapter (SCSA). Patent Number: US 6,505,991

• Designed to operate reliably in smoke control systems requiring Underwriter’s Laboratories Inc. UL555S ratings up to 350°F.