Magnetic locks, like electric strikes, use electromagnetism to control the locking mechanism. They rely on electric power, whether from a building current or a battery, and as a result they’re as dependable as a refrigerator, TV, or bedside alarm clock (though like any other household appliance they can also be vulnerable to power failure). But because no key is needed to operate magnetic locks, mag-locks can’t be picked – and you’ll never be locked out because you’ve lost the key.
The core of a magnetic lock control system is an electromagnet made of advanced metal alloys. When electric power activates it, the bolt slides in or out, up or down, along its U-shaped channel to lock or unlock the door. Some mag-locks also incorporate timing mechanisms that allow them to operate only at certain times – during business hours, for example. Others have “transaction memory,” which can record every use or attempted use. This function can be especially valuable with locks that use number-pads rather than coded cards: if an unauthorized person tries to gain access using incorrect codes more than twice, for example, the lock can automatically set off an alarm.
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