Electric Door Hold Open Device

Electromagnetic door holders and releasers keep doors open until they are released by fire alarm systems remote smoke detectors or other switching devices.

Electric door hold open device.

Electro magnets for hold open systems. For example the most common use is using the magnetic door holder as a hold open device. In the event of a power failure they release the door to a closed position to keep the facility secure. These electromagnetic door holders will keep the door open.

On commercial fire doors the magnetic fire door holders serves an array of purposes and safety functions. This is extremely useful in long hospital hallways and corridors. The trigger mechanism is used for processing signals issued by fire alarm system and the hold open mechanism works with electrical hold open or holding magnet. The statutory regulations which apply in many countries allow fire and smoke check doors to be held open for a limited period of time by electro magnetic hold open devices which in the event of a fire are de energized to release the door so as to enable automatic closing.

Primary application includes holding and releasing of fire rated doors that are required to provide a barrier for fire and smoke in an emergency or the convenience of door closure by remote control. They provide a high holding force. These exit devices hold swinging doors open in normal use and release and close doors in fire conditions.