Space-saving installation due to a narrow design width of 6.2 mm. Signaling without additional auxiliary power thanks to a mechanical status display. An optional remote signaling module monitors up to 40 articles without additional wiring. No interference with the signal during maintenance work thanks to impedance-neutral plugging and unplugging of the protective plugs. Error-free replacement of protective plugs is ensured through coding. Simple interruption of signal circuits for maintenance work is facilitated by vertical knife disconnection. Safe behavior in case of overload is provided by an integrated disconnecting device. Grounded or isolated shield grounding is possible thanks to a third terminal point on the surge protection device.