Triac as an element of constructing circuits

Triac

Triac - bidirectional (symmetrical) thyristor
It has a five-layer structure and has a thyristor characteristic with both polarities of the supply voltage.

Application
Widespread use, because has two stable states on off and on and off time is less than that of diodes. They are used in power control devices in household appliances in regulated power supplies, high-power pulse generators, in DC power transmission lines, in static reactive power comparators, etc.

WAA Triac