In Enphase installations, the Q Relay (network system
relay controller) acts as a physical disconnection device
relay controller for single-phase installations.
During specified grid abnormalities, the Q Relay
disconnects the Enphase Microinverters from the AC
grid, and when the voltages return to normal and the
grid frequency is in the acceptable range, the Q Relay
reconnects the system.
The Q Relay works in series with the Envoy-S to
break both line and neutral, when needed, per grid
requirements