This is a simple non-isolated dual-relay board. Each Leone SC5 6V relay is controlled by an individual transistor. You can connect the electrical equipment that you want to control to the screw terminals. The board is powered by 5V-6V DC input provided via header pins (two sets of pins; one is for a secondary source). There is a digital input pin to control each relay from your microcontroller system. Make sure there is a common Ground between your microcontroller board and this relay board.
Warning: Working with high voltages carries a risk of electrocution. Work with high-voltage devices only if you are qualified and understand the circuit. DO NOT TOUCH the PCB while in use and/or plugged into AC mains.
2x Relay Board Resources