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Metal Oxide Varistor Surge Arrester

 A Surge arrester is a device used on electrical power systems to protect the insulation on the system from the damaging effect of lightning. Metal Oxide varistors (MOVs) have been used for power system protection since the mid 1970s. Contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides insert between two metal plates. The limit between each small piece and its neighbor forms a diode junction, which allows current to surge in only one direction.                                                                                                                                                    
The typical Surge arrester also known as Lightning arrester has a high voltage terminal and a ground terminal. When a lightning surge or switching surge travels down the power system to the arrester, the current from the surge is unfocused around the protected insulation in most cases to earth.

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