Automatic relays are crucial components in modern electrical and electronic systems, enabling the automatic control and protection of circuits. Essentially, an automatic relay is an electromechanical or electronic device that responds to changes in electrical signals, such as current or voltage, to open or close circuits without manual intervention. Its widespread adoption across industries reflects its versatility, reliability, and role in ensuring both safety and efficiency in electrical systems.

    The working principle of an automatic relay is relatively straightforward. Most relays operate using an electromagnet, which is activated when a specific current passes through the relay coil. This magnetic field then pulls a switch, connecting or disconnecting the circuit. In more advanced relays, solid-state components replace mechanical parts, providing faster response times and longer lifespans. Regardless of the type, the fundamental idea remains the same: automatic relays react to electrical input signals and trigger a corresponding output action.