The thyristor output optocoupler is suitable for controlling AC load. Toshiba provides controllable silicon output optocouplers with 400V, 600V and 800V repetitive closed-state peak forward voltage (VDRM). VDRM = 400V optocouplers are suitable for 100V AC load applications, and VDRM = 600V and 800V optocouplers are suitable for 200V AC load applications. You can choose non-zero-crossing (NZC) thyristor output optocoupler to control the hardware phase of thyristor, or zero-crossing (ZC) thyristor output optocoupler to reduce switching noise.