Relay

Description

A relay is an electrically operated switch that uses a low-power signal to control a separate, often higher-power, circuit. It acts as an intermediary between two circuits, allowing a small current to switch a large one and providing electrical isolation between them. Relays are used in many applications, from home automation and automobiles to industrial control systems.

How it works

• A relay has two main circuits: a primary (control) circuit and a secondary (switched) circuit.
• In the primary circuit, a small current energizes an electromagnetic coil.
• This creates a magnetic field that pulls an armature, which acts as a mechanical switch.
• The movement of the armature opens or closes the contacts in the secondary circuit, allowing or interrupting the flow of a larger current to the load.
• When the control signal is removed, the magnetic field disappears, and a spring returns the armature to its original position, de-energizing the secondary circuit.