Belimo TFRB24-SR-S Actuator

The Belimo TFRB24-SR-S is a spring-return actuator designed for modulating control in HVAC systems. Operating on a 24V AC/DC power supply, it utilizes a 2-10VDC control signal to provide precise proportional positioning of dampers or valves. With a 22 in-lb torque rating, this fail-safe actuator ensures reliable closure during power loss, making it essential for mechanical rooms requiring strict safety protocols. This model includes an integrated auxiliary switch (1x SPDT), allowing for end-position signaling or interlocking with external equipment like fans or pumps. The brushless DC motor technology ensures long-term consistency and avoids the positioning drift common in older pneumatic systems. Designed for easy installation, the Belimo TFRB24-SR-S Actuator supports clockwise or counter-clockwise mounting, providing the flexibility needed for tight field retrofits or new construction air handling units.

• Precise Modulating Control: Utilizes 2-10VDC feedback for accurate air flow regulation.
• Mechanical Fail-Safe: Spring-return logic ensures the system returns to a known safety position upon power interruption.
• Integrated Auxiliary Switch: Built-in SPDT switch simplifies field wiring for status indication.
• Universal Compatibility: Standard 24V proportional actuator footprint fits most dampers and control valves.
• High Efficiency: Low power consumption during holding cycles reduces overall cabinet heat and energy costs.

Common Questions

Can the Belimo TFRB24-SR-S be used for "On/Off" applications?
While optimized for 2-10VDC modulating signals, it can function in on/off applications, though a dedicated on/off spring-return model may be more cost-effective if proportional control is not required.

What is the purpose of the -S suffix in the part number?
The -S indicates that this unit is equipped with a built-in auxiliary switch for end-stop verification or component interlocking.

Does this actuator require a specific mounting orientation?
The TFRB24-SR-S is multidirectional; the fail-safe direction (clockwise or counter-clockwise) is determined by how the unit is mounted to the shaft.

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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.