Relay wiring plays a crucial role in modern electrical systems, serving as an essential component for controlling circuits in a wide range of applications. From industrial automation to household appliances, relays are used to switch high-power circuits using low-power control signals. This article explores the fundamental aspects of relay wiring, the different types of relays, their applications, and important wiring techniques that ensure safety and efficiency.

What is a Relay? At its core, a relay is an electrically operated switch that allows the control of a high-power circuit with a low-power signal. It consists of an electromagnet (coil), a movable armature, and contacts that either open or close when the relay is activated. When current flows through the coil, it creates a magnetic field, pulling or releasing the armature to change the state of the contacts. How Relay Wiring Works Relay wiring refers to the way in which a relay is connected to the control and load circuits. A relay typically has at least four terminals： two for the coil and two for the switch (often referred to as the Common, Normally Open (NO), and Normally Closed (NC) terminals). Understanding how to wire a relay correctly is vital to ensure that the relay functions as intended.