The Belimo TFB24-S is a direct-coupled, fail-safe spring return damper actuator engineered for precise on/off regulation within commercial and industrial zoning networks. Operating reliably on a standard 24V AC/DC supply, this compact actuator produces 22 in-lb of mechanical torque to manage air dampers or valves. Its true spring return mechanism guarantees that the attached system automatically defaults to a safe position during emergency power interruptions.
Equipped with a built-in single-pole double-throw (SPDT) auxiliary switch, this actuator provides direct signaling feedback for automated automation loops or auxiliary equipment interlocking, such as starting a fan. The internal brushless DC motor is managed by an integrated microprocessor, safeguarding the unit against mechanical overload throughout its entire 95-degree rotational cycle. This eliminates any need for field adjustments or tricky limit switches.
The universal clamp assembly mounts directly onto round or square damper shafts ranging from 1/4 to 1/2 inches in diameter. Its symmetrical housing design allows for clockwise or counter-clockwise fail-safe operation simply by flipping the unit's orientation during installation. Maintenance-free operation guarantees exceptional longevity across demanding building control environments.
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