Silicon Controlled Rectifiers (SCRs) can be divided into unidirectional SCRs and bidirectional SCRs. Bidirectional SCRs are also known as TRIACs, short for 'triode for alternating current.' In terms of structure, a bidirectional SCR is equivalent to two unidirectional SCRs connected in reverse, and it has bidirectional conduction capability. Its on/off state is determined by the control gate G. Applying a positive pulse (or negative pulse) to the control gate G can make it conduct in the forward (or reverse) direction. The advantage of this device is that the control circuit is simple, there is no reverse voltage withstand problem, making it particularly suitable for use in AC contactless switches.

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