Description:-

An electromagnetic lock is a device used to control the
access through a door. It consists of an electromagnet
mounted in or on the door frame and a matching plate
that is affixed to the door. When energized, the electromagnet
holds the plate with a retention force that may
exceed 1000 lbs., thus effectively locking the door.
They are typically controlled through security
systems, keypads, key switches, card access systems,
“request to exit” buttons, and/or by special devices
worn by persons whose safety could be compromised
by uncontrolled egress.