The main function of the surge arrester is to divert the excess voltage to ground, thus avoiding more or less important faults in the domestic / industrial electrical system and in any household appliances or machinery.

The JSP Series is an AC overvoltage protection device for applications in TT and TN systems. This device is used to protect electrical systems from possible overcurrents due to overvoltages of atmospheric origin. They must be installed in parallel to the line entering the electrical panel, only in this way can they guarantee adequate protection. The units consist of a base and interchangeable cartridges. The whole series uses the "Metal Oxide Varistors (MOVs)" technology in combination with the spark gap on the neutral and must be combined with specific protections. High reliability thanks to the presence of the monitoring system "Thermo Dynamic Control." Furthermore, an exchange contact is available to remotely report the intervention indication of any of the "MOVs / Spark Gaps" cartridges.