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Think about the damages to electrical devices and machines due to neutral breaks in three-phase installations and the damages to the economy caused by fires caused by this situation; and think about preventing these damages with electronic parts worth 1 lira. You can search for 30 volt ac varistor. Warning: Connect the part to the output of the leakage current protection relay. If the varistor you are using is constantly tripping, a varistor with a higher value such as 40-50 volts should definitely be used. Another thing to wonder about is if the ground breaks at the same time. That possibility is almost impossible. The grounding is broken, the neutral is broken and at that very moment the device is leaking and is giving energy to the grounding system. If this current does not return from the neutral in some way, it will trip anyway.