Spring return direct coupled actuators (DCA) for on/off damper control with an integral junction box. The actuator accepts an on/off signal from a single-pole, single-throw (SPST) controller. They are designed to operate reliably in smoke control systems requiring Underwriter's Laboratories Inc. UL555S ratings up to 350 F.

  • Integral spring return ensures level of return torque.
  • 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 for tight damper closure.
  • Actuator holds rated torque at reduced power level.
  • Die-cast aluminum housing. Housing design allows flush mounting to damper.
  • Integral junction box with three conduit openings eliminates need for separate wiring box.
  • High-temperature indicator included.

  • Actuator Type: Damper, Valve
  • Application Type: Fire and Smoke
  • Fail Safe Mode: Spring Return
  • Control Signal: 2 position, SPST
  • Supply Voltage: 100 to 250 Vac
  • Number of Internal Auxiliary Switch: 2
  • External Auxiliary Switches Available: Yes, SW2-US
  • Shaft Adapter Type: Self Centering clamping
  • Manual Operation: Manual Crank
  • Mounting: Direct Coupled
  • Frequency: 60 Hz, 50 Hz
  • Rotational Stroke: 95 ¬+/- 3 degrees
  • Rotational Stroke Adjustment: Mechanically limited 5 degree increments
  • Spring Return Direction: By orientation
  • Timing, Maximum Spring Return (sec): 15 sec
  • Timing, Nominal Driving @ 60 Hz (sec): 15 Sec
  • Spring Return Direction: CW
  • Dimensions (in.): 9.72 in high x 3.94 in wide x 2.95 in deep
  • Compatible Damper Shafts (in.): 3/8 to 1.06 in. round or 3/8 to 11/16 in. square
  • Temperature Range, Ambient (F): 0 F to 130 F
  • Operating Humidity Range (% RH): 5 to 95% RH, non-condensing
  • Includes: Self-centering shaft adapter, 3mm crank
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Manuals (1)
Product Type:
Actuator Type:
Two Position
80 lb-in
Fire and Smoke
Fail Safe Mode:
Spring Return
NEMA-1 Enclosure
Operating Temp Range:
-40 F to 140 F
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