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wietapwietapOvervoltageprotectionImportant information onovervoltageThe necessity of overvoltage protectionon machines and systemsas well as for building technology isever increasing. The potential dangerof damage and even completedestruction posed to valuable electroniccomponents or even completeproduction systems, computersystems or communication systemsby sudden overvoltage from the grid,or direct lightning strikes has mobilizednot just insurance companies.Well-advised users also know theimportance of protecting their electricaldevices, plants and systems bothsuffi ciently and reliably against thisdanger, and the overall advantage ofincreasing their system availability.Overvoltage protection modulesOvervoltage protection modulescome in three type categories whichdesignate their capacity to absorbovervoltage energy. Type 1 arresterscan divert the largest amount ofenergy to ground (PE). The idealinstallation location for these devicesis at the building’s main supply. Inthis confi guration the impulse energyis considerably weakened, if it movesdownstream into the installation. Insub-panels and control cabinets, thissurplus energy is reduced further bytype 2 and 3 arresters, thus maintainingthe survival of the protecteddevices.11