PZH R3 HSAF* (Hermi Surge Arrester Filter) is a two-stage surge arrester. It features a high-frequency filter integrated between the two stages. PZH R3 HSAF* contains an improved thermal fuse which ensures timely disconnection of the PZH R3 HSAF* from the power grid during overheating and thus prevents damage to the PZH R3 HSAF*. Activation of the thermal fuse is signalled by an integral indicator light with the option to utilize its switching contact for remote fault signalling (S). Due the new design of the thermal fuse, the protective voltage level is 100 V lower than in the previous series of filters. The PZH R3 HSAF* S is a type T3 two-port surge arrester and has been tested according to standards IEC 61643-11:2011 and CISPR 17:2011. According to standard IEC 62305:2010, it is installed in the boundary between zones LPZ 2 - LPZ 3, where it limits induced overvoltage and residual overvoltage in power lines. PZH R3 HSAF* are designed to be mounted on a 35 mm DIN rail using a metal clip. Manufacturer’s recommendation: Install the PZH R3 HSAF* as close to the device to be protected as possible (no further than 5 m). A Hermi T1 and T2 lightning and surge arrester must be installed before the PZH R3 HSAF*.