Locking the cylinder, the external follower of the lock gets blocked and the door can not be opened. However, as it is an panic lock, the door can always be open from inside by activating the lever of the panic exit device.

With an electric signal, the electro switch clutches the inner mechanism of the lock allowing the door to be opened from outside operating the lever.

When the signal disappears, the lock becomes blocked again from outside.
Optional: inwards opening.