4 Channel 5V Relay Module with Optocoupler Isolation

4 Channel 5V Relay Module with Optocoupler Isolation

This 4-channel 5V relay module is used to control up to four external loads using a low-voltage microcontroller signal. It is commonly used in Arduino and ESP32 automation projects for switching lights, fans, pumps, solenoids, and other electrical devices. The relay contacts allow isolation between control electronics and load circuits, while optocoupler isolation may improve signal safety depending on the board design. It is suitable for home automation, IoT control, and project prototyping. Package includes the same components as the picture.