Belimo TFB24 Actuator

The Belimo TFB24 is a reliable spring return actuator designed for on/off control in damper and valve applications where safety fail-safe positions are critical. Operating on 24Vac or 24Vdc, this motor provides 22 in-lb torque, making it a standard choice for smaller dampers or baseboard radiation units. The mechanical spring return ensures the application returns to a predefined safety position during a power loss, maintaining system integrity. Built with a brushless DC motor, the TFB24 eliminates the need for limit switches and provides constant torque throughout its stroke, reducing internal wear. Its compact footprint allows for installation in tight mechanical spaces, while the universal damper actuator hardware simplifies retrofitting on various shaft dimensions. For field technicians, the low power consumption during holding maximizes efficiency in multi-actuator circuits, ensuring stable HVAC automation performance without overloading the transformer.

• Internal Spring Return: Provides reliable mechanical fail-safe operation during power interruptions.
• Brushless DC Motor: Maintenance-free operation with integrated electronic stall protection.
• Universal Compatibility: Mounts easily to round or square shafts with standard hardware.
• Low Holding Power: Reduces total VA requirements on 24V control loops.
• Directional Flexibility: Simple mounting orientation determines clockwise or counter-clockwise fail-safe rotation.

What is the typical runtime for the TFB24?
The motor drive time is approximately 75 seconds, with a spring return time of less than 25 seconds at ambient temperature.

Can the TFB24 be used in outdoor installations?
This actuator features a NEMA 2/IP54 rated housing, suitable for indoor use or protected environments; check for additional enclosures if full weather exposure is expected.

Does this unit require a specific linkage for valve applications?
While designed for dampers, it is compatible with specific Belimo WBL and mechanical linkage kits for zone valve or ball valve integration.

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.