The Lockwood PD-EL402 electric mortice solenoid lock is a fail secure lock that can be controlled by a variety of electrical impulse generating equipment such as card readers, keypads and timers. It can also be connected to automatic swing door operators and are an excellent solution for access control systems. Because of its symmetrical trigger bolt, the PD-EL402 can be used in double swing doors. The lock can always be opened mechanically by key or by thumb turn and the bolt deadlocks automatically when the door closes.