So I am new to power electronics and I am studying about the protection methods of SCR from over-voltage transient. I read that we use a varistor. But why not just use a RC snubber. I searched on the internet but couldn't find an explanation. One article just says. "However, a capacitor cannot suppress voltage surges in the same way a varistor can. When a high voltage surge is applied to a circuit, the outcome is usually catastrophic to the circuit, therefore the varistor plays an important role in the protection of delicate electronic circuits from switching spikes and over voltage transients." This is surprising to me as capacitor is also supposed to prevent voltage transients. Can someone explain?