Polaris Automation Systems sarl

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.

Search for Products

Currency december 15 2017
Click to
EUR  European euro. Used by 15 member states and 6 countries or areas outside the European union.    
CHF  Swiss franc    
GBP  Pound sterling. Scotland and Northern Ireland issues own, diffrent, banknotes.    
USD  US dollar    


Polaris AS was awarded Beirut Marina Waterfront Plot 1 & 2.

Polaris AS was awarded AVIMET project at Beirut International Airport.

You are here: Solutions Lightning & Surge Metal Oxide Varistor Surge Arresters