Circuit arrangement for overvoltage and overcurrent protection

摘要

The circuit arrangement has a voltage source (SQ) whose first connection is connected to a first connection of a first resistor (R1) and whose second connection is connected to a first connection of a second resistor (R2) and a capacitive element (SK) connecting the second connections of the first and second resistors. A third resistor (R3) is connected between a first circuit arrangement connection and the second connection of the second resistor. A fourth resistor (R4) with a positive resistance coefficient is connected between a second circuit arrangement connection and the second connection of the second resistor. The direct resistance ratio between the third and first and the fourth and second resistors does not exceed 0.2, they are mutually thermally coupled and the sum of the resistances does not exceed 50 to 70 Ohms.