For DC voltages up to 1000 V, the four poles need to be connected in series. In contrast to normal flush-mounting switched, these devices are also fitted with arcing chambers and permanent solenoids to aid the positive quenching of the electric arc in direct currents.

For this reason it is essential to comply with the polarity specifications of the switches when connecting the conductor. Suitable precautions should be taken during plant configuration to ensure there can be no polarity reversal in DC operation (e. g. photovoltaic plants).