Overvoltage protection. Measurement, control, and regulation without a signaling function or function display. The following signals are covered by the protection of 3-/4-wire systems: PT100, measuring bridges, strain gauge sensors, and more. Pluggable arrester for interruption-free and impedance-neutral plugging or unplugging. Testable by test device V-TEST. 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.