| 摘要 |
The invention relates to a circuit arrangement for the protection of at least one component 3 of a two wire electrical current loop, which is connected in series with a burden 1 to an AC/DC electrical current source 16, wherein the two wire electrical current loop has a rectifier 2, a clock signal producer 9 and a switch 3, wherein the rectifier 2 forms a DC circuit 12, wherein the switch 3 is connected in the DC circuit 12 and wherein the clock signal producer 9 outputs a clock signal T to the switch 3 for clocking the DC circuit 12, characterized in that the circuit arrangement has a diode 4, wherein the conduction direction of the diode 4 points from the anode KN of the diode 4 to the cathode KA of the diode 4, the cathode KA of the diode 4 is connected to the DC circuit 12, the anode KN of the diode 4 is supplied with a periodic or constant voltage from a first voltage source 6a, and the voltage is at least periodically greater than a predetermined threshold value S. |
