Belimo TFB24-SR-S Actuator

The Belimo TFB24-SR-S is a high-torque spring return actuator designed for proportional control in dampers and valves within high-performance HVAC systems. Operating on a 24Vac/dc power supply, it accepts a 2-10VDC control signal to provide precise 22 in-lb torque. This unit features an integrated SPDT auxiliary switch, factory-set at 95 degrees, for reliable signaling and end-stop verification. Built for longevity in demanding environments, the brushless DC motor is controlled by an Application Specific Integrated Circuit (ASIC) that monitors and provides overload protection throughout the entire stroke. The failsafe spring mechanism ensures a positive return to the original position upon power loss, a critical requirement for safety and smoke control dampers. Its compact footprint and universal spindle clamp allow for straightforward retrofit actuator installation on shafts ranging from 1/4 inch to 1/2 inch, ensuring versatile HVAC damper control across various mechanical configurations.

• Precision Control: Utilizes a 2-10VDC modulating signal to achieve accurate positioning for optimal air or fluid flow.
• Failsafe Reliability: Mechanical spring return ensures the damper or valve returns to a safe state during power failure.
• Integrated Feedback: The built-in auxiliary switch provides immediate feedback on position status without requiring external sensors.
• Low Power Consumption: Efficient brushless DC motor technology reduces energy overhead and prevents motor burnout from stalling.
• Universal Compatibility: Designed for standard HVAC control systems, fitting most small-to-medium damper applications.

Can the Belimo TFB24-SR-S be used for both clockwise and counter-clockwise return?
Yes, the direction of the spring return is determined by the mounting orientation. By flipping the actuator, you can select which direction it will move upon power loss.

How do I wire the auxiliary switch for position verification?
The TFB24-SR-S includes one built-in SPDT switch. It can be wired to a controller or local indicator to verify that the actuator has reached its fully retracted or extended limit.

Is an external transformer required for 24V operation?
Yes, ensure your 24VAC/DC power supply provides at least 4 VA for single unit operation to account for running and holding current requirements.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.