Belimo TFB24-SR Motor Actuator

The Belimo TFB24-SR is a precision-engineered spring return actuator designed for reliable control of dampers and valves in high-demand HVACR systems. Operating on a 24VAC/DC power supply, this motor provides 22 in-lb of torque, making it an ideal solution for small to medium-sized control dampers and air handling units requiring fail-safe performance. The unit utilizes a 2-10VDC proportional control signal to provide accurate positioning and modulated feedback, ensuring optimal system balance and energy efficiency. Engineered for durability, the TFB series features a brushless DC motor controlled by an Application Specific Integrated Circuit (ASIC) to prevent overload, extending the service life of the mechanical spring return mechanism. With its compact footprint and NEMA 2 (IP54) rating, this actuator supports versatile installation in tight spaces while maintaining high resistance to environmental factors common in commercial mechanical rooms.

• Fail-Safe Protection: Reliable mechanical spring return ensures the damper or valve returns to a safe position during power loss.
• Precise Modulation: Provides accurate 2-10VDC control for superior airflow management and temperature stability.
• Efficient Power Draw: Optimized for low power consumption, reducing the load on 24V control transformers.
• Long-Term Reliability: Maintenance-free operation with integrated electronic stall protection—no limit switches required.
• Simplified Mounting: Universal clamp and heavy-duty housing design facilitate quick installation on standard shafts.

How do I change the direction of the spring return on the TFB24-SR?
The direction of rotation is determined by the mounting orientation. To reverse the fail-safe direction, simply flip the actuator over on the shaft.

Can this actuator be wired in parallel?
Yes, multiple TFB24-SR units can be wired in parallel, provided the VA rating of the transformer is sufficient for the total current draw.

Does this unit require a specific feedback signal for the controller?
The TFB24-SR utilizes a standard 2-10VDC feedback signal that corresponds directly to the position of the actuator, allowing for real-time monitoring of the damper status.

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.