Relay testing plays a crucial role in ensuring the reliable operation of electrical systems, particularly in industries that rely on automation and control. A relay, an electrically operated switch, is used to control a circuit by a low-power signal, or where several circuits must be controlled by one signal. Proper testing ensures that relays function as expected under a variety of operating conditions, enhancing the reliability and safety of electrical equipment. This article delves into the various aspects of relay testing and why it is vital for modern electrical systems.