Overvoltage protection for measuring and controlling without signaling function or display. The following signals are protected by binary signals (SL - Balanced 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, buttons, position sensors, light barriers, contactors, solenoid valves, and signal lamps. Features a pluggable arrester for uninterrupted and impedance-neutral plugging and unplugging. Testable by V-TEST tester. Space-saving design accommodates up to 4 binary signals. Version with ground-free PE connection to prevent interference currents due to potential differences. Compliant with IEC 62305 and IEC 61643-22 construction standards (D1, C1, C2, and C3). Integrated PE foot safely conducts up to 20 kA (8/20 μs) and 2.5 kA (10/350 μs) to PE. Colored marking of voltage levels allows for quick identification in the control cabinet. Safety function includes a coding element for different voltage levels.