Overvoltage protection with measurement control rules and signaling function/display. The protection of analog signals and current loops (CL - Current Loop) includes the following signals: signals from current loops (analog measurements of sensors over long distances) 4-20 mA, 0-20 mA, etc. Two-, three-, and four-wire configurations without a common reference potential, e.g., level measurement. Signals from voltage transmitters (analog measurements of transmitters at short distances) 0-10 V, PT 100, etc., e.g., temperature measurement. Pluggable arrester with uninterruptible and impedance-neutral plugging and unplugging. Testable by test device V-TEST. Space-saving design for two analog signals. Version with floating PE connection to avoid potential differences. Can be used according to the IEC 62305 installation standard (D1, C1, C2, and C3). Integrated PE foot safely discharges up to 20 kA (8/20 μs) and 2.5 kA (10/350 μs) to PE. Colored marking of the voltage levels for quick identification in the control cabinet. Safety function through coding element for different voltage levels.