Device for protecting a circuit connected to a power supply system from overvoltages

A device for protecting a circuit that is connected to a power supply system from overvoltage, the device comprising

• an electrical input for receiving an electrical input voltage;
• an electrical output for outputting an electrical output voltage to the power supply system or to the circuit;
• and
• an electrical protective circuit including a detection section, a semiconductor switch and a limiting section;
• wherein the semiconductor switch is arranged between the electrical input and the electrical output, the semiconductor switch being configured to interrupt the output voltage at the electrical output when being activated;
• wherein the detection section is configured to activate the semiconductor switch using an activation voltage such that an output of the output voltage is interrupted when the input voltage reaches a threshold value;
• wherein the detection section includes a voltage threshold detector element configured to determine when the input voltage reaches the threshold value;
• wherein the limiting section is configured to limit the activation voltage of the semiconductor switch when the output voltage is interrupted;
• and
• wherein the detection section includes a current limiting component configured to limit a current flowing through the voltage threshold detector element.