Belimo AFB24-S Spring Return 24V Damper Actuator

The Belimo AFB24-S is a spring-return (fail-safe) damper actuator delivering 180 in-lb (20 Nm) of torque to position HVAC dampers from a 24 V control signal, with On/Off operation and two SPDT switches for two-position damper control. It accepts 24 VAC (±20%, 50/60 Hz) or 24 VDC (±20%), draws about 5 W running and 2.5 W holding, and provides a 95° rotation that is adjustable between 35° and 95° via a mechanical end stop. Installation features include a 5 mm hex manual override, shaft diameter 1/2" to 1.05" round with inserts to fit 1/2" and 3/4" shafts (1.05" without insert), and a visual position indicator from 0° to 95°, making it well-suited for direct-damper drive in typical HVAC applications.