Overvoltage protection. Measurement, control, and regulation without signal function or function display. The following signals fall under the protection of binary signals (SL - Symmetrical Load): switching signals with and without common reference potential of 24V, 5V to 60V. Two-wire systems typically have a common reference potential for binary sensors, actuators, and indicators such as limit switches, pushbuttons, position transmitters, photocells, contactors, solenoid valves, and signal lamps. Pluggable arrester allows for interruption-free and impedance-neutral plugging or unplugging. Testable by the V-TEST device. Space-saving design for up to 4 binary signals. Designed with a ground-free PE connection to avoid interference currents in case of potential differences. Applicable according to installation standards IEC 62305 and IEC 61643-22 (D1, C1, C2, and C3). Integrated PE foot safely dissipates up to 20 kA (8/20 μs) and 2.5 kA (10/350 μs) to PE. Colored marking of voltage levels for quick identification in the control cabinet. Safety function provided by a coding element for different voltage levels.