The 825C-50 motor lock features an electronically controlled deadlatch (adjustable split spindle) and a mechanical hook bolt that provides increased holding force with an auto retract function, it is certified according to EN179 which allows installation in escape routes. The handle can be electronically activated from the outside, and mechanically controlled from the inside; alternatively, the handle can be activated electrically from both the inside and outside to open the door. The hook bolt is withdrawn mechanically by the cylinder or thumb turn and retracted by the handle when opening.