Review on 💪 Enhanced Isolation Support for HiLetgo Channel Modules: A Game Changer by Matthew Aiono

Plugged this into a power source to make sure I understood how it works before designing a circuit around it. The attached image shows how the jumper needs to be set for the high and low trigger settings to work. The green power LED lights up as long as there is voltage between the terminals DC+ and DC-. The voltage supplied here must match the nominal voltage of the relay coil. When the relay is activated, the red LED is also lit.