Relay voltage refers to the electrical potential (or voltage) that is applied to the coil of an electromagnetic relay. When this voltage is applied, it generates a magnetic field that causes the relay’s contacts to either open or close, thereby controlling the flow of electricity in a circuit. The relay voltage is crucial because it determines whether the relay will function properly, thus enabling it to act as a switch.

    Typically, relays operate with a voltage range specified by the manufacturer. This range is known as the "rated voltage," and it ensures the relay's reliability and longevity. The relay coil's voltage is typically lower than the voltage handled by the contacts, which can be used for controlling high-power devices like motors, lights, and industrial machines. Relay voltage can be DC (direct current) or AC (alternating current), and selecting the correct voltage type and value is vital for the system's overall performance.