Overvoltage protection systems for low voltage and domestic electric consumers

The protecting systems against overvoltages produced all over the world make more and more use of variable resistors based on metal oxides known under the name of varistors as they present a series of advantages when compared with other similar protecting systems. In this respect, the paper presents, besides a short comparative analysis of the protecting system, a Romanian concept concerning the realization of protecting modules equipped with ZnO varistors and original experiments which demonstrate their high quality and usefulness.