TRIAC symbol
Also called Bidirectional thyristor, AC switch
Two thyristors back to back with one gate, so it switches AC current in both directions.
ANSI / IEEE
IEC 60617What the TRIAC symbol means
Two thyristors back to back with one gate, so it switches AC current in both directions.
ANSI and IEC symbols
Where you see it
Light dimmers, heater control, solid state relays and small motor speed control.
Related symbols
Frequently asked questions
What does the TRIAC symbol look like?
On ANSI drawings: Two opposite triangles between two bars, with a gate. In IEC 60617: The same symbol.
Is the TRIAC symbol the same in IEC and ANSI?
Yes, it is drawn the same way in most legends.
Where is a TRIAC used?
Light dimmers, heater control, solid state relays and small motor speed control.
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