Patent ID: 8369050

Claim:
A circuit (S) for protecting at least one DC network with DC loads ( 1 ) connectable to the circuit (S), wherein the circuit (S) is suitable and configured to supply the DC network with electric energy from a single-phase or multi-phase AC power grid via a rectifier (G), to protect the DC network against overvoltages from the AC power grid, comprising the circuit (S) includes means ( 2 , 3 , 4 , TH 1 , L S , C S , D U , D V , D W ) for detecting an overvoltage, which is suitable and configured to detect an overvoltage at the input of the DC network, the circuit (S) includes means ( 2 , 3 , 4 , TH 1 , L S , C S , D U , D V , D W ) for transferring the current from one or several current-carrying thyristors (TH U1 , TH V1 , T W1 ) of a first group of thyristors (TH U1 , TH V1 , TH W1 ) of the rectifier (G), as soon as the means for detecting the overvoltage has detected an overvoltage, wherein transfer of the current forces the thyristor or thyristors (TH U1 , TH V1 , TH W1 ) of the first group to turn off.