# How To Read A Relay Schematic

By | May 28, 2023

## # How to Read a Relay Schematic

A relay is an electromechanical switch that is controlled by an electrical current. Relays are used to control high-voltage or high-current circuits with a low-voltage or low-current signal. They are commonly used in industrial applications, but they can also be found in a variety of consumer products, such as car starters and garage door openers. Relays are typically depicted in schematic diagrams using a standard set of symbols. By understanding these symbols, you can easily read and understand a relay schematic.

### The basic parts of a relay

A relay consists of two main parts: the coil and the contacts. The coil is a wire winding that is connected to the control circuit. When current flows through the coil, it creates a magnetic field that attracts the plunger. The plunger is a metal rod that is connected to the contacts. When the plunger is attracted, it closes the contacts, which completes the circuit in the load circuit.

### Relay symbols

The following symbols are commonly used to represent relays in schematic diagrams: *

### The coil:

A coil is represented by a circle with a dot in the center. The dot represents the terminal that is connected to the control circuit. *

### The contacts:

Contacts are represented by two parallel lines. The line on the left represents the normally open (NO) contact, and the line on the right represents the normally closed (NC) contact. *

### The return spring:

A return spring is represented by a curved line that connects the plunger to the contacts. The return spring keeps the contacts open when the coil is not energized.

To read a relay schematic, you need to identify the following components: * The coil * The contacts * The return spring * The control circuit * The load circuit The control circuit is the circuit that energizes the coil. The load circuit is the circuit that is controlled by the relay. Once you have identified the components of the relay schematic, you can follow these steps to understand how it works: 1. Trace the control circuit from the power source to the coil. 2. Trace the load circuit from the contacts to the load. 3. When you energize the coil, the magnetic field will attract the plunger. 4. The plunger will close the contacts, which will complete the circuit in the load circuit.

### Examples of relay schematics

The following are two examples of relay schematics: * [Simple relay schematic](https://i.imgur.com/30x336b.png) * [Complex relay schematic](https://i.imgur.com/2391p0k.png) These schematics show how relays can be used to control a variety of circuits. In the simple schematic, the relay is used to turn on a light bulb. In the complex schematic, the relay is used to control a motor.

### Conclusion

Relays are versatile devices that can be used to control a wide range of circuits. By understanding how to read a relay schematic, you can use relays to create your own electronic projects.

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