A strike plate is a metal plate affixed to a door jamb with a hole or holes which the latch or bolt is received. When the door is closed, the bolt and or latch extend into the strike plate, and holds the door closed.
An electric strike is an electric device installed on door frames. It replaces the fixed strike plate. Like a fixed strike, it normally presents a ramped surface to the locking latch allowing the door to close and latch just like a fixed strike would. However, an electric strike’s ramped surface can, upon command, pivot out of the way of the latch allowing the door to be opened without the latch being retracted (that is, without any operation of the mechanical locking device). Electric strikes generally come in two basic configurations: Fail-secure. Also known as Fail-locked or non-fail safe. In this configuration, applying electrical current to the strike will cause it to open. In this configuration, the strike would remain locked in a power failure, but typically the locking device can still be used to open the door from the inside for egress from the secure side. DC power will offer silent operation, except for a “click” while the unit releases. Fail-safe. Also known as Fail-open. In this configuration, applying electrical current to the strike will cause it to lock. In this configuration, it operates the same as a magnetic lock would. If there is a power failure, the door would open merely by being pushed/pulled open. Fail safe units are always run using DC power.