You are here: PRODUCTS / Electric Strikes / Standard applications / Model 17®, 27, 37 / Fail-locked 17® Fail-locked 17® Universal electric strike, standard, with FaFix® (FF) 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 17Electric strike FaFix® adjustment range, Fail-locked Electric strike 17EElectric strike FaFix® adjustment range,Fail-locked Electric strike 17RRElectric strike FaFix® adjustment range, Monitoring conta… Electric strike 1705Electric strike FaFix® adjustment range, Diode (05), Fail-locked