Relays are electronic components that act as switches operated by electrical signals. They work on electromagnetic principles with a coil and mechanical structure. Relays perform functions like controlling high voltage current, providing logical operations and delays, and protecting other components from excess current. They connect weak current devices to strong current devices. Common relay types include single pole single throw (SPST), single pole double throw (SPDT), double pole single throw (DPST), and double pole double throw (DPDT). Example applications of relays include regulating robot motion, installing car lights, connecting motor horns, automating various controls, and intelligent traffic light control.

1. Dwiky Purba C
IL3A/4.32.20.0.04

2. 
 Relay is one of the special electronic components or
devices where it becomes a switch that can be
operated automatically. Relays are operated by
triggering or inputting electrical signals.
 Relays work on the principle of electromagnetics.
Where the relay itself is built based on 2 main
structures, namely electromagnetic or coil and
mechanical.
What is Relay Definition?

3. 
Drawings of Relay Shapes
and Symbols

4. 
1. High voltage current flow controller;
2. Components that perform logical functions;
3. Component tasked with providing delays to the
operation of other components;
4. Other components protection from excess electric
current;
5. The connection between Weak Current or DC devices
and Strong Current or AC devices;
Relay Functions in
Electronics

5. 
Relay Structure

6. 
Types Of Relays And
Characteristics
1. Single Pole Single Throw (SPST)
This relay is a type of relay that has 4 pins / feet. With details:
• 2 feet as Coil;
• 1 Leg as Pole
• 1 Leg as Throw
2. Single Pole Double Throw (SPDT)
This relay is a type of relay that has 5 pins/feet. With details:
• 2 feet as Coil;
• 1 Leg as Pole
• 2 Feet as Throw
3. Double Pole Single Throw (DPST)
This lay is a type of relay that has 6 pins/feet. With details:
• 2 feet as Coil;
• 2 Feet as Pole
• 2 Legs as a Standing Throw each
4. Double Pole Double Throw (DPDT)
This relay is a type of relay that has 8 pins/feet. With details:
• 2 feet as Coil;
• 2 Feet as Pole
• 4 Feet as Throw

7. 
1. As a regulator of motor motion on the Robot
2. Important components in the installation of Car
Lights
Example of Application of
Relay Component

8. 3. Connecting components on the motor horn
4. Control components for various automation
5. Intelligent control of traffic lights (SPST relay application)

9. Source: https://caraengine.com/function-relay-is/