Application of power momentarily unlocks the outside knob. A key retracts the latchbolt. Model H25TB-177 Fail safe operation. The outside knob is locked by the application of power. Latchbolt can always be retracted from the inside.
Power loss unlocks the outside knob.
A key retracts the latchbolt. Electrified mortise locks are also available. Electric Hinges Electric hinges provide the most secure transfer of either electric power or alarm signals between a door and frame. They should be used only to replace the center non-load bearing hinge on doors with three hinges. Sizes and finishes other than shown can be special ordered.