| Item Description | Surge protection device for power supply systems / B20 is the encapsulated gas discharge tube type 2 according to EN 61643-11 and IEC 61643-11. These arresters are recommended for use in the lightning protection zones concept at the boundaries of LPZ 1-2 (according to IEC 62305 and EN 62305), in the power supply lines, which are operated as TN-s and TT systems, where they provide the equipotential bonding between n and PE in the connections of 1+1 or 3+1. Thanks to the high insulation resistance at the release condition, the GDT will not cause the activation of RCD. Note: For it power supply networks use a special variant of gas DICHARGE tubes - find more in the catalogue's annex for it networks |