Derate switch for DC?

If they're switching only 200 mA they'll be fine.

Ed

"amdx"

Switches rated for so many amps at 125 or 250 volts AC are *normally* also suitable for 12 volt and 24 volt DC switching at the same current. Above 24 volts DC, the chance of a sustained arc forming across the contacts upon breaking a circuit becomes very high - switching high current DC requires special techniques.

One proviso is that the load be predominantly resistive - highly inductive loads or loads with high inrush surges like halogen lamps and transformers are special cases.

Relay coils are capable of generating large voltage spikes when de-energised - so it is good practice to place a diode or small cap across the coil to suppress the spike which otherwise can provoke contact arcing.

..... Phil