At its core, an Optocoupler Protected Relay Module integrates two key components: an optocoupler and a relay. These components work in tandem to control large electrical loads with low-voltage signals while ensuring the protection of sensitive control circuitry.

    Optocoupler: The optocoupler, also known as an optical isolator, is a device that uses light to transmit electrical signals between different parts of a circuit while providing electrical isolation. It consists of an LED (light-emitting diode) and a phototransistor (or photodiode). When a signal is passed through the LED, it emits light that activates the phototransistor, which in turn generates a corresponding signal on the output side. This process effectively separates the high-voltage circuit from the low-voltage control system, preventing electrical noise, surges, and faults from affecting the sensitive control components.