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The QSR24 is a second generation power close, spring open actuator that provides increased torque and quiet operation. An internal brake controls the rewind speed of the motor and eliminates the loud noise caused by the motor and gears when rewinding.
Unit of Measure



N/A Power Close Spring Open

Motor Torque at Starting (Close)

N/A 90 in·oz

Motor Torque at Fully Close (Close)

N/A 65 in·oz

Spring Torque at Starting (Open)

N/A 54 in·oz

Spring Torque at Fully Close (Open)

N/A 37 in·oz

Rotation Angle

N/A 93 º

Adjustable Close Angle

N/A Optional, from 50% to fully closed

Operate Time

N/A 30 seconds to fully close 16 seconds to fully open


N/A Very quiet, mechanical brake controls rewind speed

Direction of Rotation

N/A 24 VAC power rotates shaft CCW, viewed from top of actuator Spring rotates shaft CW, viewed from top of actuator

Alternating Current (AC) Electrical Power Voltage

N/A 24 V

Electrical Power Current

N/A 0.33 A7.9 V·A


N/A Shaft with collar and setscrew for 5/16-inch shaft


N/A Molded plastic cover Steel base with polished chrome finish

Electrical Connection Wire Length

N/A 4 in

Electrical Connection Wire Size

N/A 18 AWG

Hexagonal Set Screw Size

N/A 1/4-20 in

Acceptable Shaft Diameter

N/A 5/16 in

Anti-Rotation Pin Diameter

N/A 0.25 in

Anti-Rotation Pin Length

N/A 1.00 to 1.50 in

Zone Number

N/A 4



N/A 3.34 in


N/A 2.67 in


N/A 2.89 in

Additional Information

Additional Information

  • Quick and easy set up using PDM on the panel
  • Use PDM to select options, test installation and display detailed data
  • Quickly clone multiple panels
  • Eliminate bypass duct work using modulating actuators

Optional Close Stop Plate

Optional Close Stop Plate

N/A The QSR24 can be supplied with the adjustable stop plate that allows the closed position to be adjusted from 50% to fully closed. The stop plate can also be provided as an add-on kit.