SCRs use a simple R-C turn-off snubber circuit. The
purpose of the R-C snubber circuit is not so much to
reduce turn-off switching loss but rather to prevent
false triggering from applied or reapplied dv/dt [1,2].
At turn-off, SCR current is diverted into the snubber
capacitor C, via resistor R. The thyristor turns off
clamped thyristor to the snubber capacitor voltage,
which increases from zero. At the subsequent
thyristorturn-on the energy stored in C, 1/2CV: is
dissipated as heat, mainly in the resistor R.