What is the main function of a control relay?

The main function of a control relay is to switch electrical circuits. A control relay acts as an electromechanical switch that opens and closes circuits in response to an electrical signal. When a specific voltage is applied to the relay's coil, it creates a magnetic field that activates an armature, causing it to move and either complete or break a circuit. This ability to control larger currents and voltages with a smaller input makes relays essential in various applications such as automation, control systems, and safety devices.

Understanding the role of a control relay in switching circuits is fundamental to motor control and automation. It allows for safe and efficient operation of electrical systems, making it a crucial component in many industrial and commercial applications.