The invention relates to a circuit for connecting to a phase conductor and to a neutral conductor of an energy network, comprising a first line strand that on the input side can be connected to the phase conductor via a first diode element, a second line strand that on the input side can be connected to the phase conductor via a second diode element, wherein the two diode elements are oriented opposite to one another with respect to the phase conductor. Between the first line strand and the neutral conductor of the low voltage network, a first coil element is arranged, and between the second line strand and the neutral conductor, a second coil element is arranged, wherein the two coil elements are conductively coupled with one another. Between the first line strand and the neutral conductor, a first condenser element is arranged, and between the second line strand and the neutral conductor, a second condenser element is arranged.