An electric door strike replaces the fixed strike faceplate of a normal door. 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 pushed open (from the outside) without the latch being retracted (that is, without any operation of the knob) or while excited the knob or lever can be turned to allow egress from the secured area.
Electric Door Strikes can be installed for wooden and metal doors. Most strikes are meant for indoor use. There are however specialised outdoor heavy duty strikes suitable for pedestrian side gates.
Electric Door strikes generally come in two basic configurations. They are defined by how they respond in the event of power failure. And for some door strike, these configuration is switchable. The two configurations are :
Also called fail-locked or non-fail safe. The strike would remain locked in a power failure, but typically the knob can still be used to open the door from the inside for egress from the secure side.
Also called fail-open. Applying an electric current to the strike will cause it to lock and if there is a power failure, the door would open merely by being pushed/pulled open..