Surge Protection Device, Phase Three, Voltage 1/8V AC Wye Item # 18K854;Keep in mind that all the 8V1V panels have the neutral wire especially in Wye configuration except if there is no need to use 1V single phase system or special kind of three phase motors (such as wastewater pump) which does not need a neutral wireThis Spike Stopper ® unit is designed to work with 1/8 Wye electrical systems This unit provides protection to all modes and discrete protection to 4 modes If you need extreme protection, order the Spike Stopper ® All Mode Plus 3Y1 1/8 model Peak Surge Currents available from 50 – 0 kA per phase Single Phase Transformers Connected In A Wye Installation 120 208 wye