Honeywell MS4609F1210/B Damper Actuator

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Honeywell MS4609F1210/B Damper Actuator is a spring-return actuator designed for the on/off control of dampers in HVAC systems. It has a torque rating of 80 lb-in (9 N•m) and a stroke of 95 degrees. The actuator is reversible, so it can be used for either clockwise or counterclockwise spring rotation. It also features two internal auxiliary switches for position indication.

Applications: HVAC systems, Smoke control systems, Fire suppression systems, Ventilation systems, Industrial control systems

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Honeywell MS4609F1210/B Damper Actuator is a high-quality, reliable damper actuator that is ideal for a variety of applications, including HVAC systems, smoke control systems, and industrial automation. It is a spring return, meaning that it will automatically return to its closed position when power is removed. This makes it ideal for use in applications where safety is a top priority.

Features of Honeywell MS4609F1210/B Damper Actuator:

  • • 30 lb-in. (3.4 N•m) or 80 lb-in. (9 N•m) minimum driving torque at 350°F (176°C).
  •  Reversible mounting facilitates use in either clockwise (cw) or counterclockwise (ccw) spring rotation.
  •  Integral spring return ensures the level of return torque.
  •  Fifteen-second spring return timing.
  •  No special cycling is required during long-term holding. (See Operation section.)
  •  No audible noise during holding.
  •  Patent pending design eliminates the need for limit switches to reduce power consumption.
  •  Models available for 24, 120, and 230 Vac.
  •  Ninety-five-degree angle of rotation.
  •  The actuator holds rated torque at a reduced power level.
  •  Die-cast aluminum housing.
  •  The housing design allows flush mounting to the damper.
  •  Designed to operate reliably in smoke control systems requiring Underwriter’s Laboratories Inc. UL555S  ratings up to 350°F.
  •  Models available with SPST position-indicating switches (7°, 85° stroke)

Additional information

Weight 3 kg


Model No



Damper Actuator

Voltage (Vac)

230 ±10%, 50/60 Hz

Internal Auxiliary Switches


Minimum Damper Shaft Length

2 in. (51 mm).

Switch Lead Wires

18 inches, 18 AWG, 2 color coded leads


95° ± 3°, mechanically limited


80 (9)

Electrical Connections

32 inches (0.8m), 18 AWG


Round 1/2 inch shaft adapter with 1/4 inch set screws.
Threads: ¼-20 UNC-2A
Material: Alloy Steel hardened to HRC 45-53
Thread Lock: Nylon Patch

Ambient Temperature

-18°C to 55°C

Controller Type

two-position, SPST

Noise Rating (Maximum)

Driving Open: 75 dBA at 1m.
Holding: 20 dBA at 1m (no audible noise).

Humidity Ratings

5% to 95% RH noncondensing



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Damper Actuator

Honeywell MS4609F1210/B Damper Actuator