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BELIMO TFB24-SR-S Spring Return Actuator

BELIMO TFB24-SR-S Spring Return Actuator

  • $331.63



For fail-safe, modulating control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. The actuator is mounted directly to a damper shaft from 1/4” up to 1/2” in diameter by means of its universal clamp, 1/2” shaft centered at delivery. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft. The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500Ω resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication.

The TF -S versions are provided with one built-in auxiliary switch. This SPDT switch is provided for safety interfacing or signaling, for example, for fan start-up. The switching function is adjustable between 0° and 95°.


  • Torque: 22 in-lb [2.5 Nm]
  • Voltage AC/DC: AC/DC
  • Angle of Rotation: 95°
  • Direction of Rotation (Fail-Safe): Reversible with cw/ccw mounting
  • Shaft Diameter 1/4...1/2" round centers on 1/2"
  • Actuator Type: Spring return
  • Auxiliary Switches: 1 SPDT
  • Application: Air
  • Control Type: Modulating
  • Degree of Protection: IP42, NEMA 2, UL Enclosure Type 2
  • Running Time (Fail-safe):<25 s
  • Running Time (Motor): 95 s constant independent of load


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