For protecting consumer systems in the mains-side connection compartment of the meter cabinet on a 40mm busbar against transient overvoltages caused by direct and indirect lightning strikes, as well as switching operations. Meets all requirements for the installation of overvoltage protection according to DIN0100-534, test classes I, II, III according to IEC 61643-1, SPD type T1+2+3, compliant with IEC 61643-11: 2011, EN 61643-11: 2012+A11: 2018, lightning protection class III and IV according to IEC 62305, leakage current-free, with integrated fuse to protect the SmartMeterGateway and the APZ