Electromagnetic door holder

An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release. A fire alarm control panel or a similar emergency control system usually controls the door holder.

This article is about a mechanism to hold a door open. For the magnetic locking mechanism, see Electromagnetic lock.
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