AC power relays are also used for safety cut-off between the solar inverter and the utility grid. The purpose of this safety measure is to prevent abnormal currents that occur from affecting the commercial power supply as well as the solar inverter itself. Panasonic has 4 relay solutions designed specifically for this application. The number of relays necessary for this design will depend on the contact arrangement of the relay and the size of the inverter. These solutions will be covered over the next few slides.