Belimo AFB24-SR-S Motor Actuator

The Belimo AFB24-SR-S is a high-torque spring return actuator designed for fail-safe applications in HVAC damper control and valve automation. Delivering 180 in-lb of torque, this 24V proportional actuator operates on a 2-10VDC control signal, providing precise modulation for large air handlers and demanding ventilation sequences. Engineered for reliability in commercial HVAC systems, it features dual internal auxiliary switches for position signaling and end-stop verification. The rugged NEMA 2 housing ensures durability in mechanical rooms, while the brushless DC motor provides constant torque and reduces power consumption during holding. This direct-coupled actuator supports universal mounting, making it a standard replacement for failing power-return units. Whether managing outside air intake or critical exhaust, the AFB24-SR-S ensures the system returns to a defined safety position during power loss, maintaining pressure boundaries and protecting hydraulic heating and cooling coils from freezing.

• 180 in-lb Spring Return: Reliable mechanical fail-safe operation for large-scale dampers.
• 2-10VDC Modulation: Precise positioning for optimized airflow and energy efficiency.
• Integrated Auxiliary Switches: Two built-in SPDT switches for feedback and interlocking control.
• Universal Compatibility: Works with standard 24VAC/DC power supplies and digital controllers.
• Brushless DC Technology: Eliminates motor burnout and ensures consistent performance under load.

Can the AFB24-SR-S be used for both clockwise and counter-clockwise fail-safe?
Yes, the direction of the spring return is determined by the orientation of the actuator on the shaft. Setting the mounting direction defines the fail-safe position.

Is this actuator suitable for outdoor installation?
The unit features a NEMA 2/IP54 rated enclosure; however, for direct weather exposure, an additional NEMA 4X weather shield is recommended.

Does this model allow for manual override?
Yes, it includes a manual crank that allows technicians to position the damper during commissioning or power outages.

This item is not eligible for free shipping.

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.