Relay functions are essential components in many electronic systems, providing a wide range of applications across various industries. These devices, which operate as electrically controlled switches, play a pivotal role in controlling high-power circuits with low-power control signals. Their ability to handle electrical load and provide isolation between control and power circuits makes them indispensable in industrial automation, automotive applications, and household electronics. In this article, we will explore the core functions of relays, their working principles, applications, and their importance in modern electronic systems.
What Are Relay Functions? A relay is an electrical switch that is activated by an electromagnet. The core function of a relay is to allow a low-voltage control circuit to control a high-voltage circuit, which would otherwise be difficult or unsafe to manipulate directly. When an electric current passes through the coil of the relay, it generates a magnetic field that attracts or repels a switch mechanism, opening or closing the circuit. This basic operation allows relays to perform key functions, such as switching, amplifying signals, and providing electrical isolation. Relay functions can be classified into several types based on their behavior and usage:
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