This Opto-isolated will protect microcontrollers and sensors from high voltages leaking through, As a result, you can safely control larger appliances without the worries of high voltage feedback. You can also choose your trigger level by simply changing a jumper. For triggering at 5V place the jumper in its place, for triggering on GND you can simply remove the jumper.
Opto-isolated 2 channel 5V Relay Module Specs:
- Operating Voltage: 5V
- Trigger Voltage: 2V - 5.5V
- Output Current: 10A 30VDC/10A 250VAC