A Relay is used to control a circuit by a low-power signal. It is made of a coil and a set of contacts. When the coil is energized, it creates a magnetic field that attracts the contacts together, closing the switch. When the coil is de-energized, the magnetic field disappears and the contacts spring apart, opening the switch.

Attributes:
• Used to control the speed and direction of motors
• Manufactured to precise specifications and are built for durability, reliability

Applications:
A Relay is used to protect circuits from overloads and short circuits.