Spring Return Fail-Safe On/Off Fire & Smoke Actuator, 120 VAC, 180 in-lb (2 x SPST)

Spring Return Fail-Safe On/Off Fire & Smoke Actuator, 120 VAC, 180 in-lb (2 x SPST)

The FSAF_A-S Auxiliary Switch actuators provide true spring-return operation for reliable fail-safe application and positive close-off on UL555S dampers. The spring-return system provides constant torque to the damper with and without power applied to the actuator. The FSAF_A series provides 95° of rotation and is provided with a graduated position indicator showing 0...95°. Two SPST auxiliary switches provide means of closed and open damper position indication.
The FSAF_A series actuators are mounted to the damper axle shaft or jackshaft (1/2” to 1.05”) via a cold-weld clamp. Teeth in the clamp and V-bolt dig into the metal of both solid and hollow shafts maintaining a perfect connection. The specially designed clamp will not crush hollow shafts. The bottom end of the actuator is held by an anti-rotation strap or by a stud provided by the damper manufacturer. The actuator is mounted in its fail safe position with the damper blade(s) closed. Upon applying power, the actuator drives the damper to the open position. The internal spring is tensioned at the same time. If the power supply is interrupted, the spring moves the damper back to its fail-safe position.