A snubber network is an R/C (resistive/capacitive) network connected in parallel with a thyristor in a phase-control dimmer. Its purpose is to prevent false turn-on of the thyristor in the presence of fast voltage spikes. The parameter limited by the snubber network is known as dv/dt (delta voltage divided by delta time).
Modern SCR's and Triacs have very high dv/dt ratings and generally require no snubber network or one of a very small value.
If present, a snubber network can add to the leakage current a dimmer will pass when set to 0%.
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