RS Pro WG A3 Series Three Phase SSR. RS Pro WG A3 series solid state relays are able to switch three phase loads with one control signal up to rated line currents of 45A and line voltages up to 480Vac. The WG A3 has high noise immunity and an internal overvoltage protection which becomes effective at 1000 V. Zero cross or random switching Maxi puck housing Panel mounted AC Loads DC Input 3-Phase