A Dual Relay Module typically contains two independent relays that can switch high-voltage circuits on or off using a low-voltage control signal. This allows microcontrollers, which typically operate at 3.3V or 5V, to control larger, higher-voltage devices such as home appliances, motors, and industrial equipment. The module generally includes opto-isolators, which provide electrical isolation between the control side (low voltage) and the switching side (high voltage), ensuring the safety of the microcontroller.

    How Does It Work?

    The basic operation of a Dual Relay Module is quite simple, yet powerful. Each relay has two main components： a coil and a switch. When the relay is energized, the coil generates a magnetic field that pulls the switch into the closed position, completing the circuit and allowing current to flow. Conversely, when the coil is de-energized, the switch returns to its open position, cutting off the current flow.