11 – Magnetic Locks

Publisher Summary This chapter covers another common type of lock that is Magnetic Lock. It discusses the various types of Magnetic Locks and when and where each should and should not be used. Magnetic Locks are the workhorse of electrified locking mechanisms for most security contractors. They are easy to install, versatile, provide good security, and are generally dependable. Magnetic locks can be fitted to any door with a metal or wood surface near the top of the door, so they can be fitted to more than 90% of doors installed in commercial installations. Magnetic locks work by using an electromagnet on the door frame and an armature mounted to the door. When the door closes, the armature comes into contact with the electromagnet. Magnetic locks can also function as a door position switch and lock engaged switch, when so configured. This is done by sensing the magnetic bond between the electromagnet and the armature. When the bond is made, the lock is locked, and thus the door is closed. All surface-mounted magnetic locks should be mounted on the secure side of the door.