Simple Wiring Diagram Relay

Relay is an electrically operated switch (Switch) and is an Electromechanical (Electromechanical) component which consists of 2 main parts namely Electromagnet (Coil) and Mechanical (a set of Contact Switches / Switches). The relay uses Electromagnetic Principles to drive the Switch Contact so that a small electric current (low power) can conduct electricity with a higher voltage. For example, with Relays using 5V Electromagnets and 50 mA capable of moving the Armature Relay (which functions as a switch) to deliver electricity 220V 2A.
Relay Functions and Applications
Some Relay functions that have been commonly applied into Electronic equipment include:
Relay is used to run Logic Function
Relay is used to provide a Time Delay Function
Relays are used to control high voltage circuits with the help of low voltage signals.
There is also a relay that serves to protect the motor or other components from excess voltage or short circuit (short).