You are here: PRODUCTS / Electric Strikes / Standard applications / Model 14, 24, 34 / Fail-locked 14 Fail-locked 14 The door can only be opened while a contact is made. In alternating current operation, a humming noise is audible. In direct current operation, there is no noise. When mounting with a throw-open spring or throw-open bolt, the door is opened visibly after a contact is made. Electric strike 14Electric strike Fail-locked Electric strike 14RRElectric strike Monitoring contact (RR), Fail-locked Electric strike 1405Electric strike Diode (05), Fail-locked