What is a TRIAC?TRIAC DefinitionA TRIAC is defined as a three-terminal AC switch that can conduct current in both directions, suitable for AC systems.A TRIAC is defined as a three-terminal AC switch that can conduct in both directions, unlike other silicon controlled rectifiers. It can conduct whether the applied gate signal is positive or negative, making it ideal for AC systems.This is a three terminal, four layer, bi-directional semiconductor device that controls AC power. The triac of maximu