According to the invention a dc(20) breaker is provided. The dc breaker is arranged in a main current path (26) connected between a first dc circuit (36) and a second dc circuit (7). The dc breaker comprises a primary current path (24) connected to the main current path. A mechanical interrupter switch (3) and an electronic breaker switch (4) are connected in series in the said primary current path. Furthermore, a secondary current path (28) is provided in parallel to the primary current path. In the secondary current path a capacitor (5) is arranged so as to be in parallel with the serially connected switches of the primary current path.
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