Plug-in lightning current arrester, according to Type 1 / Class I, for use in power supply systems between N and PE. This plug-in lightning current arrester (Type 1/Class I arrester) serves as an N/PE spark gap, featuring an ignition mechanism for triggering the response voltage. It offers protection against incorrect fitting with incorrect plugs due to the mechanical coding of the base element and plug. There is a labeling option for protective plugs and connection terminals on the base element. It includes two biconnect terminals each for N and PE, designed for connecting round conductors and wiring bridges.