The Noark surge arrester is designed to protect electrical installations from direct low-intensity lightning strikes. The line of surge arresters consists of class 1+2 devices. Suitable for lightning protection zone 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 its surge can be 75 or 100 kA depending on the configuration and location of the point grounding, grounding of the lightning protection system and the place where the surge arrester is installed. The design of the Ex9UE1+2 12.5 surge arresters is based on varistor elements. It provides a low response time and meets the criteria of both Class I and II. The modular design with the possibility of replacing the insert allows for quick and simple replacement of functional modules in the event of their burnout due to the frequent occurrence of overvoltage peaks.