Protective circuit

Abstract

The invention relates to a protective circuit for limiting the voltage for a device to be protected, particularly a load with an upstream-connected voltage and current limiting device, the device to be protected being provided in an output circuit of the protective circuit and is separable by means of a switching element, a voltage detector being provided with an electronic switch on the one hand and a voltage sensor on the other and the control terminal of the electronic switch is in electrical operative connection with the voltage sensor. A microdevice with a control circuit is provided, in which the microdevice has the switching element and is designed with a high input resistance of the control circuit. The control circuit is galvanically separated from the output circuit switchable by means of the control circuit, in which the control circuit of the microdevice is in electrical operative connection with the electronic switch and the device to be protected for the separation of a voltage applied is located in the output circuit of the microdevice.

Dependencies are inferred from the claim text.