Four-pole disconnecting device for DC interruption between a DC source (U DC) and a load, comprising - a main current path between a first input terminal (E 1) and a first output terminal, - a return current path between a second input terminal (E 2) and a second output terminal (A 2), - a circuit breaker arrangement (5, 6, 8) having a series circuit comprising a first circuit breaker with a magnetic trigger and a second circuit breaker and having a third circuit breaker, the series circuit comprising the first circuit breaker and the second circuit breaker being connected in the main current path and the third circuit breaker being connected in the return current path, and - wherein the switching contacts (C, C, C123) of all three circuit breakers (5, 6, 8) of the circuit breaker arrangement (5, 6, 8) are coupled by means of a common switching mechanism, and - semiconductor electronics connected in parallel with the first circuit breaker, which are current-blocking when the circuit breaker arrangement (5, 6, 8) is carrying current and are current-conducting at least briefly when the circuit breaker arrangement (5, 6, 8) is tripping, in that when the circuit breaker arrangement (5, 6, 8) is tripping, the current, in particular an arc current generated as a result of an arc, is commutated from the first circuit breaker to the second circuit breaker, commutates from the first circuit breaker to the semiconductor electronics, with the second circuit breaker and the third circuit breaker of the circuit breaker arrangement (5, 6, 8) being connected in series with the semiconductor electronics for the purpose of galvanic isolation of the load from the DC source (U DC) in the event of tripping. - a main current path between a first input terminal (E 1) and a first output terminal, - a return current path between a second input terminal (E 2) and a second output terminal (A 2), - a circuit breaker arrangement (5, 6, 8) having a series circuit comprising a first circuit breaker with a magnetic trigger and a second circuit breaker and having a third circuit breaker, the series circuit comprising the first circuit breaker and the second circuit breaker being connected in the main current path and the third circuit breaker being connected in the return current path, and - wherein the switching contacts (C, C, C123) of all three circuit breakers (5, 6, 8) of the circuit breaker arrangement (5, 6, 8) are coupled by means of a common switching mechanism, and - semiconductor electronics connected in parallel with the first circuit breaker, which are current-blocking when the circuit breaker arrangement (5, 6, 8) is carrying current and are current-conducting at least briefly when the circuit breaker arrangement (5, 6, 8) is tripping, in that when the circuit breaker arrangement (5, 6, 8) is tripping, the current, in particular an arc current generated as a result of an arc, is commutated from the first circuit breaker to the second circuit breaker, commutates from the first circuit breaker to the semiconductor electronics, with the second circuit breaker and the third circuit breaker of the circuit breaker arrangement (5, 6, 8) being connected in series with the semiconductor electronics for the purpose of galvanic isolation of the load from the DC source (U DC) in the event of tripping.