Switching device for operation with different input control voltages

A switching device, in particular for operating with different input control voltages, comprising:

• a first and a second input terminal for applying an input control voltage (20), a current measurement path connected to the first and second input terminals, the current measurement path having a predetermined electrical resistor and a current sensor connected in series therewith, the current sensor being configured to measure a current flowing through the current path,
• a switching unit which is configured to close and open at least one load circuit and is electrically connected to a control circuit,
• a controllable switching element which is designed to close and open the control circuit,
• a control and evaluation device which has a first input which is electrically connected to the current sensor,
• a memory device which is electrically connected to the control and evaluation device and in which an assignment table is stored which assigns a switch-on voltage threshold value and a switch-off voltage threshold value to each predetermined input control voltage value from a plurality of n different predetermined input control voltage values,
• wherein the control and evaluation device is configured to,
• i) determine a voltage value depending on a current value measured by the current sensor and the predetermined electrical resistor and check whether the determined voltage value can be associated with one of the n different predetermined input control voltage values, and if so;
• ii) depending on the predetermined input control voltage value associated with the determined voltage value, read out the associated switch-on voltage threshold value and the associated switch-off voltage threshold value from the memory device and provide them as the current switch-on and switch-off threshold value, respectively.