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The thyristor is a four-layered, three terminal semiconductor device, with each layer consisting of alternately N-type or P-type material, for example P-N-P-N.n earlier gas filled tube device called a thyratron provided a similar electronic switching capability, where a small control voltage could switch a large current. It is from a combination of thyratron and  transistor  that the term thyristor is derived.
The protective device shown in Figs.'4 and 5 is particularly adapted to transmitting circuits wherein a larger current carrying device is desired. The general arrangement is similar to that shown in Figs. 1 to 3 inclusive, except that the overall dimensions of the Thyrite discs and their number employed are increased.