A contactless window tape alarm interlock device is provided that eliminates the need to manually connect or separate an alarm system and tape strips mounted on panes of glass contained in operable window frames. This prevents breakage of the connections when the window frame positions are shifted for servicing or cleaning. An assembly containing an oscillator, detector and magnetic coupling coils is mounted to each fixed window casement. An electrical tape strip is bonded to each window pane and is connected with a pair of coils contained in an assembly mounted to each moveable window frame. The coil assemblies are located in magnetic proximity to one another. The signal from the oscillator is coupled to the detector via the coils and window tape. Any change in the coupling between coils or a break in any of the strips causes a detector to set off the alarm.
