Rotary actuator for controlling air handling dampers with a fail-safe function in case of power failure. Designed for use in ventilation and air conditioning applications to regulate the passage of air through ductwork. The fail-safe function is ensured by a return spring that is constantly under tension. In the event of a power failure, the spring automatically resets the actuator to a safe position.

Features: 

• torque 4 Nm
• damper size approx. 0.6 m2,
• rotation angle 90 degrees 
• adjustment time 60 s 
• spring closure 15 s
• continuous control 0...10 V
• protection class IP54
• dimensions 123.8 mm (l) x 72 mm (w) x 62.5 mm (h)

Advantages: 

• fail-safe return spring function
• reliable motors capable of handling any load
• overload resistant
• does not require a position limit switch
• maintenance-free
• quiet operation
• includes mounting bracket
• mechanical position indicator