Description

MS4104, MS4109, MS4604, MS4609, MS8104, MS8109 Fast-Acting, Two-Position Actuator FOR FIRE/SMOKE CONTROL APPLICATIONS The MS4104, MS4109, MS4604, MS4609, MS8104 and MS8109 Fast-Acting, Two-Position Actuators are spring retur direct coupled actuators (DCA) for Fire and Smoke dampers (on/off 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. Description 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. • Fifteen-second spring return timing. • No special cycling required during long-term holding. (See Operation section.) • No audible noise during holding. • Patent pending design eliminates need for limi 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 operate reliably in smoke control systems requiring Underwriter’s Laboratories Inc. UL555S ratings up to 350°F. • Models available with SPST position-indicating switches (7°, 85° stroke).