Triode for alternating current, TRIAC, is an electronic component that can control power in two direction in an AC circuit. The figure (a) shows the block construction and schematic symbol of TRIAC. The TRIAC is operated like two SCRs in parallel connection in opposite direction like shown in figure (b). This is the figure of the operation of TRIAC;
A TRIAC can be triggered by either polarity, positive and negative. It has only single gate, even though the figure (b) shows each SCR has a gate. The TRIAC operates in same direction with an SCR in forward direction because the TRIAC is operated in both directions, operating and blocking.
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