Legrand surge arrester type 2/Class II according to IEC/EN 61643-11, 1+1 circuit, for TT and TN-S systems, nominal voltage 230/400 V AC, discharge current Imax (8/20) 20 kA/pole. Maximum continuous voltage (Uc) 320 V AC. For protection against overvoltages of downstream consumers caused by indirect lightning strikes or switching operations. With plug-in protection module and status display: Green (SPD ready for use) Orange (replace plug-in protection module).