TRIAC
A TRIAC is a three-terminal electronic component that conducts current in either direction when triggered. The term TRIAC is a genericised trademark.
TRIACs are a subset of thyristors and are related to silicon controlled rectifiers. Wikipedia
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Nov 13, 2019 · TRIACs are semiconductor devices that feature three terminals. They operate by using one terminal—i.e., the gate—to trigger the flow of ...