An arrangement for connecting and disconnecting DC networks includes a main bus for connecting a plurality of DC lines with each other. First and second DC lines are connected between first and second DC networks and the main bus via respective main switches. The DC networks contain a DC operating equipment, such as a converter, an energy storage device, a DC chopper, a DC cable, an energy source and/or a load. A transfer bus that is electrically connected to the main bus has a transfer bus disconnector for disconnecting the main bus from the transfer bus, a transfer switch, and a current limiting device with a resistor and a parallel resistor bypass switch. The first DC line is connected to the transfer bus via a first transfer disconnector and the second DC line is connected to the transfer bus via a second transfer disconnector.