Model range 138W ProFix® 1
The electric strike is locked for as long as the power is on. If the power is switched off or if there is a power cut, the keeper can be moved and the door can be opened.

Electric strike 138W.10
Adjustable keeper (FF, FaFix®), Fail-unlocked, Bi-directional diode

Electric strike 138W.20
Adjustable keeper (FF, FaFix®), Monitoring contact (RR), Fail-unlocked, Bi-directional diode