Function

The 120M Deadlatch is a motor-operated lock. When the door in a locked closed condition, the latchbolt is deadlocked preventing the latchbolt from being retracted. Once the motor is energized the deadlatch is lifted and the latchbolt is allowed to retract, unlocking the lock.

The motor is equipped with a motor switch that allows for a full cycle operation. Full cycle (M) operation uses a momentary contact switch to rotate the motor 360° and unlock the lock. Once the door opens, the latch will project and the lock will return to a locked condition once the door is closed. Full cycle typically uses the “Mechanical Holdback” feature as described below.

The deadlock indicator switch provides monitoring of the deadlocked condition as well as the full projection of the latchbolt.

When ordering, the full cycle lock is usually specified as having “Mechanical Holdback,” which allows the bolt to be retracted until the door opens.