Includes: Mounting bracket, self-centering shaft adapter, 3mm crank

MS4120, MS7520, MS8120 Spring Return Direct Coupled Actuators (DCA) are used within heating, ventilating, and air-conditioning (HVAC) systems. They can drive a variety of quarter-turn, final control elements requiring spring return fail-safe operation.

  • Brushless DC submotor with electronic stall protection for floating/modulating models.
  • Brush DC submotor with electronic stall protection for 2-position models.
  • Self-centering shaft adapter (shaft coupling) for wide range of shaft sizes.
  • Models available for use with two-position, single pole single throw (spst), line- (Series 40) or low- (Series 80) voltage controls.
  • Models available for use with floating or switched single-pole, double-throw (spdt) (Series 60) controls.
  • Models available for use with proportional current or voltage (Series 70) controls.
  • Models available with combined floating/modulating control in a single device.
  • Models available with adjustable zero and span.
  • Models available with line-voltage internal end switches.
  • Access cover to facilitate connectivity.
  • Metal housing with built-in mechanical end limits.
  • Spring return direction field-selectable.
  • Shaft position indicator and scale.
  • Manual winding capability with locking function.
  • UL (cUL) listed and CE compliant.
  • All models are plenum-rated per UL873.
  • Actuator Type: Damper, Valve
  • Application Type: HVAC
  • Fail Safe Mode: Spring Return
  • Control Signal: Floating, (0)2-10 Vdc (4-20 mA w/500 ohm resistor)
  • Supply Voltage: 24 Vac +/- 20%
  • 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): 20 sec
  • Timing, Nominal Driving @ 60 Hz (sec): 90 Sec
  • Rotation to Open: by switch
  • Spring Return Direction: By orientation
  • 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): -40 F to 140 F
  • Operating Humidity Range (% RH): 5 to 95% RH, non-condensing
Read more
Actuator Type:
Control Signal:
0 to 10 VDC
175 lb-in
Fail Safe Mode:
Spring Return
Operating Temp Range:
-40 F to 140 F

Replacement Parts (2)

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