Surge protection. Measuring, controlling, and regulating with signal and function display. The following signals are protected: binary signals (SL - symmetrical load), including switching signals with and without a common reference potential of 24V, 5V, and up to 60V. Two-wire systems typically have a common reference potential for binary sensors, actuators, and indicators such as limit switches, push buttons, position sensors, photoresistors, contactors, solenoid valves, and indicator lights. The pluggable surge protection allows for interruption-free and impedance-neutral plugging and unplugging. Testable with the V-TEST device. Space-saving design for up to 4 binary signals. Designed with a ground-free PE connection to avoid stray currents in case of potential differences. Complies with installation standards IEC 62305 and IEC 61643-22 (D1, C1, C2, and C3). Integrated PE foot safely diverts up to 20 kA (8/20 μs) and 2.5 kA (10/350 μs) to PE. Color-coded voltage levels for quick identification in the control cabinet. Safety function through a coding element for different voltage levels.