Relays are used in electrical systems primarily as electrically operated switches. They serve multiple purposes:

1. Isolation:

Relays provide electrical isolation between different parts of a circuit, allowing low-voltage control circuits to manage higher-voltage systems safely.

2.Control:

They can control a high-power or high-voltage circuit with a low-power signal, making them ideal for situations where direct control isn’t practical.

3. Logic Operations:

In some applications, relays are used for basic logic operations and signal routing.

4. Safety:

They can be used as protection devices in electrical circuits to prevent overloads and short circuits by breaking the circuit if necessary.

5. Automation:

Relays are integral in automating electrical systems, such as in industrial machines, automotive circuits, and home appliances, enabling complex operations based on simple inputs.

In essence, relays are crucial for controlling, protecting, and automating electrical systems efficiently and safely.