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The A250-MOC is a 24VAC power open/dose or modulating actuator for use with zoning dampers and provides 250 in-oz of torque. The actuator can operate either open/dose or modulating.

Used with the eWD2 and eWD3 panels, the A250-MOC can be used for bypass excess air flow by opening just enough to maintain the minimum air flow and eliminate the need for bypass ducts and a barometric damper.

The A250-MOCT is supplied with mounting tabs and mechanically attached to the damper on standoffs.
Unit of Measure



N/A Power Open Power Close Modulating

Torque (Open and Close)

N/A 250 in·oz

Rotation Angle

N/A 90 º

Adjustable Close Angle

N/A Adjustable from 50% to fully closed

Operate Time

N/A 7 seconds fully close to fully open


N/A Silent

Direction of Rotation

N/A CCW to Open, viewed from top of actuator

Alternating Current (AC) Electrical Power Running Voltage

N/A 24 V

Alternating Current (AC) Electrical Power Holding Voltage

N/A 24 V

Running Electrical Power Current

N/A 0.17 A4 V·A

Holding Electrical Power Current

N/A 0.007 A0.2 V·A


N/A Coupling with set screw for 5/16-inch diameter shaft and anti-rotation pin same as spring return actuator.

Optional Mounting

N/A Coupling with set screw for 5/16-inch diameter shaft and mounting tabs at both ends.


N/A Die-cast metal base with plastic cover

Electrical Connection

N/A Screw terminals for AWG18 thermostat wire

Zone Number

N/A 4



N/A 4.20 in


N/A 2.90 in


N/A 2.70 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

Adjustable Close Limit

Adjustable Close Limit

N/A The Close position can be set or limited using the internal cam. Simply loosen the screw and rotate the cam CW and tighten screw. Minimum close position can be used to insure some air flow even when damper is closed.

Loosen screw and rotate plastic cam. Tighten screw.



N/A Made in the USA.