An arrangement comprising - a first DC circuit with a first connection node and a second connection node; - a circuit breaking device with a first connection node and a second connection node, wherein the circuit breaking device is adapted to brake a DC component in the current path between its first and second connection nodes, and wherein the first connection node of the first DC circuit is connected to the first connection node of the circuit breaking device ; - a second DC circuit with a first connection node and a second connection node the first connection node of the second DC circuit being connected to the second connection node of the circuit breaking device , while the second connection node of the second DC circuit is connected to the second connection node of the first DC circuit ; said circuit breaking device comprising - a mechanical interrupter switch having contacts movable relative to each other between a closed position arranged to conduct current flowing there through and an open position arranged to break a current flowing there through; - an electronic breaker switch connected in series with the mechanical interrupter switch between the first and second connection nodes of the circuit breaking device, the electronic breaker switch being operable to open from a closed state arranged to conduct current flowing there through to an open state arranged to break a current flowing there through upon receipt of an electronic opening signal; - a capacitor connected in parallel to the serially connected mechanical interrupter switch and the electronic breaker switch ; - a first varistor connected in parallel to both the capacitor and the serially connected mechanical interrupter switch and the electronic breaker switch ; and - a second varistor connected in parallel to the first DC circuit between the first and second connection nodes of the first DC circuit , wherein - a knee voltage of the second varistor being less than a knee voltage of the first varistor . - a first DC circuit with a first connection node and a second connection node; - a circuit breaking device with a first connection node and a second connection node, wherein the circuit breaking device is adapted to brake a DC component in the current path between its first and second connection nodes, and wherein the first connection node of the first DC circuit is connected to the first connection node of the circuit breaking device ; - a second DC circuit with a first connection node and a second connection node the first connection node of the second DC circuit being connected to the second connection node of the circuit breaking device , while the second connection node of the second DC circuit is connected to the second connection node of the first DC circuit ; - a mechanical interrupter switch having contacts movable relative to each other between a closed position arranged to conduct current flowing there through and an open position arranged to break a current flowing there through; - an electronic breaker switch connected in series with the mechanical interrupter switch between the first and second connection nodes of the circuit breaking device, the electronic breaker switch being operable to open from a closed state arranged to conduct current flowing there through to an open state arranged to break a current flowing there through upon receipt of an electronic opening signal; - a capacitor connected in parallel to the serially connected mechanical interrupter switch and the electronic breaker switch ; - a first varistor connected in parallel to both the capacitor and the serially connected mechanical interrupter switch and the electronic breaker switch ; and - a second varistor connected in parallel to the first DC circuit between the first and second connection nodes of the first DC circuit , wherein - a knee voltage of the second varistor being less than a knee voltage of the first varistor . <EOS>