Electric strike latch designed especially for dead bolt locks: As opposed to standard electric strikes, when the door is open the electric strike latch is hinged open and therefore in the position to accept the bolt of the dead bolt lock.
Fail unlocked operation.
The electric strike is locked for as long as the power is on. If the power is switched off or if there is a power cut, the electric strike latch can be moved and the door can be opened.

When the door is closed, the electric strike latch is moved into the closed position by the bolt. Thus an unintentional locking of the open door can be avoided.