Relays are crucial components in modern electrical systems, widely used for protecting circuits, controlling automation processes, and ensuring the efficient operation of electrical equipment. A relay is an electrically operated switch that can control a variety of electrical devices. This Relay Operation Guide provides an overview of the essential principles of relay functionality, installation, operation, and maintenance.

1. What Is a Relay? A relay is a device that uses an electromagnet to mechanically operate a switch. When a current passes through the coil of the electromagnet, it generates a magnetic field, pulling or pushing a contact to either open or close a circuit. Relays can be used for a variety of purposes, including protection, automation, and control in electrical systems. 2. Types of Relays There are several types of relays, each designed to serve specific functions. Understanding the type of relay used in a system is essential for proper operation and troubleshooting. Electromagnetic Relays： These are the most commonly used type, where an electromagnetic coil controls a set of contacts.