It is a magnetic lock. It is a locking device that consists of an electromagnet and an armature plate. Locking
devices can be either "fail safe" or "fail secure". Typically the electromagnet portion of the lock is attached to
the door frame and a mating armature plate is attached to the door. The two components are in contact when the door
is closed. When the electromagnet is energized, a current passing through the electromagnet creates a magnetic flux
that causes the armature plate to attract to the electromagnet, creating a locking action. Because the mating area
of the electromagnet and armature is relatively large, the force created by the magnetic flux is strong enough to
keep the door locked even under stress. It is durable and vandal proof.


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