R-C (resistor-capacitor) snubbers are used to suppress arcing when a contact is opened or to suppress kickback when a coil is de-energized. Pre-assembled R-C snubbers are available in a variety of ratings (Quencharc® and RIFA RC-units are two trade names) or you can assemble R-C snubbers from discrete components. Because the resistor is in series with the capacitor, the wattage requirements are low (less than 0.25 W).
Use the following calculations to size the R-C snubber that is appropriate for your application. Always round up to the next value available.
for each 10 V·A of steady state load
