Belimo TFB24-3 Actuator

The Belimo TFB24-3 is a rugged spring return actuator designed for on/off or 3-point floating control in HVAC dampening systems. Delivering 22 in-lb [2.5 Nm] of torque, this motor ensures reliable fail-safe operation in small to medium-sized dampers or economical control valves. Operating on a 24VAC/DC power supply, it features a brushless DC motor and mechanical stops to prevent over-rotation. Its compact footprint and NEMA 2 (IP54) housing make it ideal for light commercial applications where space is limited and long-term positioning accuracy is required. When power is lost, the integrated spring mechanism returns the actuator to its safety position, preventing costly system failures or airflow issues. This unit is compatible with standard damper shafts and is frequently utilized in VAV systems and makeup air units requiring precise control and failsafe protection.

• 22 in-lb Torque: Provides sufficient force for standard dampers and small valve assemblies.
• Spring Return Failsafe: Ensures the damper returns to the start position during power interruptions.
• Universal Compatibility: Operates on both 24VAC and 24VDC for versatile field installation.
• Floating Control: Enables 3-point control logic for incremental positioning.
• Long Life Cycle: Durable construction and overload protection provide consistent performance in demanding environments.

Common Questions

Is the Belimo TFB24-3 compatible with 120V systems?
No, this model requires a 24V transformer or power source for 24VAC or 24VDC operation.

Can I use this for modulating 2-10VDC signals?
The TFB24-3 is designed for 3-point floating control. For proportional modulation, a different actuator in the TF series, such as the TFB24-SR, would be required.

What is the typical run time for this actuator?
The motor duration is approximately 75 seconds for 95 degrees of rotation, with a spring return time of less than 25 seconds.

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.