Apparatus for switching a direct current in a pole of a DC voltage network

A DC voltage switch comprising:

• a first node;
• a second node for series integration with the first node into a pole of a DC voltage line;
• a third node for connection to the other pole of the DC voltage line;
• a mechanical switch arranged between the first node and the second node;
• a pulse current module arranged between the first node and the second node and in parallel with the mechanical switch;
• wherein the pulse-current module
• includes three module nodes, the first module node is connected to the first node and the second module node is connected to the second node and the third module node is connected to the third node;
• four semiconductor switches connected as bridges comprising two series of two of the semiconductor switches;
• wherein potential points between the semiconductor switches of the two series correspond to the first and second module node and the outer ends of the two series of in each case two of the semiconductor switches are connected in pairs to a fourth module node and a fifth module node;
• a pulse current capacitor connected in parallel with the two series of in each case two of the semiconductor switches;
• and
• a switchable semiconductor element between the fifth and third module node.