The unit is designed to detect a broken neutral condition from the incoming supply.
Once a broken neutral condition is detected, the unit forces the RCD (Residual Current Device or Earth Leakage) to operate and isolate the single-phase load from the incoming supply.
Without this device, a broken neutral condition will go undetected and create an unsafe environment with a high risk of electrocution. This device also ensures all appliances that are connected to the single-phase load are protected from broken neutral overvoltage conditions.
