The Snubber circuit is one type of dv/dt protection circuit of the thyristor.
With the help of snubber circuit, the false turn-on of a thyristor due to large dv/dt can be prevented.
RC Snubber Circuit for SCR dv/dt Protection:
This type of snubber circuit consists of a series combination of resistance R and Capacitance C in parallel with a SCR.
Based on the above discussion we can say that simply a Capacitor C is sufficient to protect the SCR against dv/dt false triggering.
Then what is the purpose of resistance R?
In actual practice, R, C and the load current parameters should be such that
Normally R,S and load circuit parameters form an undamped circuit so that dv/dt is limited to acceptable values.
In some RC snubber circuits, a diode D used to connect in parallel with the resistor R. It is used for the purpose of bypass and thus giving improved dv/vt protection.
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