The primary purpose of a relay is to control a larger circuit with a smaller, separate control signal. It essentially acts as a switch, allowing a low-power signal to switch on or off a higher-power circuit. This allows for remote control, automation, and protection of electrical systems.
The primary function of a relay module is to switch electrical devices or systems on and off. It also serves to isolate control circuits, ensuring that low-power devices, such as microcontrollers, can safely control higher voltages and currents.
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