Spring-operated "separate function" control mechanism, used in fire ventilation cut-off dampers – current impulse control

In this type of mechanisms, the transition to the safety position is initiated by an electromagnetic release that releases the bolt of the spring drive …

During normal operation of ventilation and air conditioning systems, fire dampers remain open, Fire ventilation cut-off dampers, however, remain closed. During the normal operation of the facility, both cut-off fire dampers and fire ventilation cut-off dampers, so they remain in a waiting position. …