PZH R3 HSAF3/63 S/40 (Hermi Surge Arrester Filter) is a two-stage surge arrester. A high-frequency filter is integrated between these two stages. The PZH R3 HSAF3/63 S/40 includes an upgraded thermal fuse, which ensures the timely disconnection of the PZH R3 HSAF3/63 S/40 from the main supply when the varistor overheats and prevents the PZH R3 HSAF3/63 S/40 from any damage. The activation of the thermal fuse is signalled by an integrated light indication with the possibility of using the switch contact for remote monitoring (S) to signal the fault. PZH R3 HSAF3/63 S/40 is a two-port surge arrester Type T2+T3 tested according to standards IEC 61643-11:2011 and EN 55017 (CISPR 17:2011). According to EN 62305 ed.2 (IEC 62305:2010) it is to be installed at the interface of LPZ 1 - LPZ 3 zones, where it limits the induced overvoltage and residual overvoltage in power lines. PZH R3 HSAF3/63 S/40 is installed to the switchboard base by four screws. Manufacturer’s recommendation: PZH R3 HSAF3/63 S/40 is to be installed as close as possible to the protected device (max. 5 m). A T1 lightning and surge arrester from Hermi must be installed in front of PZH R3 HSAF3/63 S/40A.