FUSIBLE LINK RELEASE
On activation the link, which is a soldered link, separates and releases at 68 degrees centigrade, on the manual fire door this will release the drop bar and the fire door will close under its own weight, on the electric fire door the manual brake release is activated and the shutter will close under a controlled manner.
MANUAL SOLENOID RELEASE
All solenoid release mechanisms are designed to be linked into the fire alarm.
The signal from the fire alarm will trigger the manual brake release and allow the door to close under a controlled descent.
AUTO SOLENOID RELEASE
Again this is linked to the fire alarm, this is the most commonly used activation allowing for frequent testing & re-setting, when the door is returned to the open position (after removal of fire signal), the solenoid can be automatically reset.