Opto coupled power triacks for AC voltage power control.
Pros: The advantage triacks are high power and switching frequency baside of ability of switch AC voltages. The optocouplers isolate the high voltage part of the circuit from the low voltage controlling part.
Cons:Unlike the relays it needs heatsink.

• up to xxx VDC
• up to xxx A/output
• 6000V optocoupler isolation
• Simple 1 port interface:
    2 inputs control the 2 triacs
    LED feedback for each inputs
• Output (2 screw terminal blocks/channel):
    triac pin A
    triac pin B