HS50-50 and HS55 are a lightning arresters type 1 according to EN 61643-11 and IEC 61643-1. These are recommended for use in the Lightning Protection Zones Concept at the boundaries of LPZ 0 1 (according to IEC 1312-1 and EN 62305) for lightning current equipotential bonding in power supply systems entering the building.
The lightning arresters are constructed as an encapsulated multiple spark gaps for installation in main switchboards. They are is mainly intended for use in TNC systems. For TNS and TT systems it is necessary to combine these arresters with lightning arrester HS100 (or JK110) which is recommended for equipotential bonding between N and PE.
HS55 arrester is intended for special installations in industrial buildings requiring max. continuous operating voltage of 440 V AC. The main use of HS55 arrester is in main switchboards of large industrial buildings and places with high risk of a direct lightning strike.