An electromagnetic relay is an electrically operated switch that allows a low power circuit to control a high power circuit. It is a crucial component in modern electrical and electronic systems, offering versatile switching capabilities for a wide range of applications. In this article, we will explore the working principle of electromagnetic relays, their types, and their extensive use in various industries.
Working Principle of an Electromagnetic Relay At its core, an electromagnetic relay consists of a coil, an armature, a set of contacts, and a spring mechanism. The primary function of a relay is to act as an electrically controlled switch, which can open or close a set of contacts in response to the input signal. When a current flows through the coil, it generates a magnetic field. This magnetic field attracts a movable armature, causing the contacts to change their state (open or close), thereby completing or breaking a circuit in the process. The relay operates as follows： Electromagnetic Force： When an electrical current is passed through the coil, the coil generates a magnetic field.