The Noark surge protective device is used to protect electrical installations against direct, low-intensity lightning strikes. The surge arrester line consists of Class 1+2 devices. Suitable for Lightning Protection Level (LPL) III, IV according to EN 62305 in a 3-phase TN-C network, where the total surge current introduced into the electrical installation is 37.5 kA, and the stroke can be 75 or 100 kA depending on the configuration and location of the earthing point, earthing of the lightning protection system, and the installation location of the surge protective device. The design of Ex9UE1+2 12.5 arresters is based on varistor elements. It provides a fast response time and meets the criteria for both Class I and II. The modular design with a plug-in insert allows for quick and easy replacement of functional modules if they burn out due to the frequent occurrence of overvoltage peaks.
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