For DC, you may find it advantageous to use a Diode+RC snubber, as it can offer far better spike suppression than a simple RC snubber without increasing the initial switch closure current significantly. Its like a normal RC snubber except you add a fast diode (e.g. Schottky) across the resistor so when the switch opens the load current transiently flows through the capacitor and the diode with minimal initial extra voltage drop. The resistor provides a discharge path for the capacitor when the switch closes, limiting the current. The resistor can typically be increased to several K, and because the extra current through the switch is limited by the resistor, you can use a much larger capacitor to suppress the spike to the desired limiting voltage - typically double the supply voltage.