The 1X series is comprised of an electromechanical voltage operated relay which is wired across the circuit being monitored. The relay may be ordered to operate in one of four (4) different application modes as described in the Technical Bulletin.

The relay is designed for flush mounting utilizing a single 25mm diameter mounting hole which also houses the large LED indicator. Electrical termination is made via four screw terminals on the rear of the case. This terminal block is of a plug in type with integrated retention screws further simplifying installation.