The 1SVR560731R3702: As a grid feeding relay, this unit monitors voltage, frequency, and phase balance on the line side of an inverter or generator. If parameters drift outside the preset thresholds—over/under voltage, over/under frequency, or phase loss—it trips the contactor or circuit breaker, isolating the distributed generation from the mains. This is the core function required for grid-tied solar, wind, or CHP installations per IEC 61727 and VDE-AR-N 4105.
The relay's output contacts connect directly into the safety chain; a fault condition opens the grid connection until the utility supply returns to normal limits.