Relay electrical diagrams are essential for understanding how relays work in various electrical circuits. A relay is an electromechanical switch that allows a low-power control signal to switch a high-power circuit, providing a crucial link between low-voltage and high-voltage systems. In this article, we will explore the key components of a relay, how to read and interpret a relay electrical diagram, and the practical applications of relays in electrical engineering.

What is a Relay? A relay is an electrical device used to control a high-power circuit using a low-power signal. It consists of an electromagnet (the coil), a set of contacts, and a mechanical armature. When an electric current passes through the coil, it creates a magnetic field that attracts or repels the armature, causing the contacts to either open or close. This action allows the relay to control circuits such as motors, lights, or other devices. Relays come in various types, such as single-pole, double-pole, normally open (NO), and normally closed (NC), with applications across different industries like automotive, industrial machinery, and telecommunications.