Relay connections are a crucial aspect of electrical and electronic systems, enabling the control of high-power circuits with low-power control signals. A relay is an electromechanical device that functions as a switch. It uses a small current to control a much larger current, making it an essential component in many automated and electrical systems. This article explores the concept of relay connections, their working principle, and common applications in various industries.
What is a Relay? At its core, a relay consists of an electromagnet (coil), an armature, and a set of contacts. When a current flows through the coil, it generates a magnetic field that moves the armature, which either closes or opens the contacts. This action allows the relay to control the flow of electricity in a separate circuit without a direct connection between the control and the power circuit. Working Principle of Relay Connections The primary function of a relay is to use a small input current to control a larger output current. The control signal is typically provided by a low-voltage system, such as a microcontroller or an automation system. When the control signal is activated, it energizes the relay’s coil, creating a magnetic field that causes the relay’s contacts to change position. There are two main types of relay contacts：