The R-C Snubber is intended to suppress the “inductive kickback” from relay coils or devices that create an electromagnetic
collapsing field. High energy noise spikes are generated whenever current is
interrupted through an inductive load connected to a switching circuit. These
electromagnetic noise spikes (EMI) may interfere with electronics equipment
causing erratic operation, CPU failure and may also accelerate relay contact
wear. Typically this helps to protect radio controls from spikes on the control lines across contactor or relay coils. Applied across an inductive load, the R-C snubber suppresses the electrical
noise spikes to electronics and extends contact life on mechanical relays.
Use across contactor coils on a control panel. .2 uF 1/2W 100 ohm up to 300V.