Surge arrester T2 4P 40kA TT/TNS defect indication. Surge arrester type 2 in 3+1 circuit, for protecting three-phase TT and TN-S systems. Consists of a four-way base element, three protective plugs with temperature-monitored high-performance varistor and a plug as a total current spark gap with dynamic disconnection device. Optical defect indication on the plugs in the event of overload. Connections for the active conductors from below and for earth/PE from above. Biconnect terminals for connecting round conductors and wiring bridges. Labeling option on the base element.