| A triac is an AC conduction device and may be thought of as two antiparallel thyristors monolithically integrated onto the same silicon chip. |
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| A lamp module is similar, but has a triac instead of a relay and will respond to dimming commands as well as on or off commands. |
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| A second triac or the like is connected between the intermediate point of the winding and the terminal of the voltage supply to which the first triac is connected. |
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| Optocoupler consists of LEDs on one side and a photodiode, phototransistor, or triac photocathode on the other side. |
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