Fire Damper Actuator – MS4104, MS4109, MS4604, MS4609, MS8104, MS8109 Fast-Acting, Two-Position Actuators

FEATURES
• 30 lb-in. (3.4 N•m) or 80 lb-in. (9 N•m) 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.
• Patent pending design eliminates need for limit
switches to reduce power consumption.
• Models available for 24, 120 and 230 Vac.
• 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.
• Designed to operated reliably in smoke control
systems requiring Underwriter’s Laboratories Inc.
UL555S rating up to 350°F.
• Non-UL marked version available.
• Models available with SPST position-indicating
switches (7°, 85° stroke).

APPLICATION
The MS4104, MS4109, MS4604, MS4609, MS8104,
MS8109 Fast-Acting, Two-Position Actuators are spring
return direct coupled actuators (DCA) with an integral
junction box 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 return and are designed to operate reliably in
smoke control systems requiring Underwriter’s
Laboratories Inc. UL555S ratings up to 350°F if
applicable.