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TAC DuraDrive Direct Coupled Actuators are designed to be used in both damper and valve control applications. The following general instructions are for damper applications. Refer to the Applicable Literature table for valve literature.

The MS4X-7XX3 series spring return actuators provide proportional modulation control of dampers and valves in HVAC systems.

  • Proportional models controlled by 6-9 Vdc, 2-10 Vdc, or 4-20 mA with the addition of a 500 ohm resistor
  • Rugged die-case housings rated for NEMA 2 / IP54
  • Optional built-in auxiliary switch to provide for interfacing or signaling
  • Provides 95° of rotation
  • Visual position indicator provided
  • Provides true mechanical clockwise or counterclockwise spring return operation for reliable fail safe application and positive close-off in air tight damper applications
  • MS40-7043-MPX models controlled by 6-9 Vdc with auxiliary 20 Vdc power supply provides power to controllers, replacing MP-5XXX/MPR-5XXX electrohydraulic actuators
  • Direct mount to round or square damper shafts
  • Switch provided for selection of direct or reverse acting control mode
  • Rotation limiting available
  • MS4X-7153 series actuators can be doublemounted (gang mounting) to accommodate high torque application requirements
  • Five year warranty
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Manuals (1)
Fail Safe Mode:

Spring Return

Actuator Type:





35 lb-in


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