Snubber circuit to protect SCR/Diode
You don't need a snubber then. Also, SCRs latch on and cannot turn themselves off once on. So as long as the trigger signal is removed when the current crosses zero, the SCR will turn off on its own.

Actually now that I reminded myself about that, an SCR can't interrupt current even if you wanted it to so a snubber is pointless. The SCR can only turn off when the current becomes zero due to external means anyway.