Belimo TFB24-S Motor Actuator

The Belimo TFB24-S is a spring-return actuator designed for reliable on/off control in HVAC systems. Providing 22 in-lb of torque, this compact unit is engineered for small damper applications and control valves requiring fail-safe positioning. It operates on a universal 24VAC or 24VDC power supply, offering flexibility for various control circuits. This model features an integrated SPDT auxiliary switch, pre-set for signaling at 95 degrees, allowing for seamless integration of end-stop verification or fan startup interlocks. Built with a rugged NEMA 2 housing and a mechanical position indicator, the Belimo TFB24-S ensures consistent performance in demanding environments. The spring-return mechanism provides a positive seal upon power loss, a critical requirement for fire and smoke safety sequences or coil freeze protection. Its brushless DC motor technology prevents burnout by managing stall conditions effectively throughout the rotation.

• Fail-Safe Reliability: True mechanical spring return ensures the damper or valve returns to the safety position during a power failure.
• Integrated Auxiliary Switch: One built-in SPDT switch reduces the need for external relays and simplifies field wiring for status feedback.
• Simplified Installation: The universal 24V input and compact footprint allow for easy retrofit in tight mechanical spaces.
• High Durability: Maintenance-free operation with a brushless motor designed for long-cycle life in on/off control applications.

Can the TFB24-S be mounted in any orientation?
Yes, the actuator can be mounted in any position, provided the spindle or shaft linkage is properly aligned to avoid side-loading the drive mechanism.

What is the purpose of the integrated auxiliary switch on this model?
The switch provides a dry contact signal typically used to confirm the actuator has reached its end-of-travel position, often used for interlocking fans or pumps.

How does this unit handle over-rotation or stalling?
The drive utilizes electronic stall sensing; it does not require limit switches and will automatically stop when it reaches the end of stroke or a mechanical block.

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.