If you need AC power control (lights, home equipment), a thyristor can help you with that. This is a very common module with very low on-resistance and a control voltage, which is compatible with any 3.3V or 5V microcontroller or mechanical switch. Thyristor allows you to control high-power devices with very low-power control mechanisms. This board has an optoisolator to protect your micro-controller from high AC currents. We also left more space, if you need to install the heat sink for the thyristor.