What is the principle of electromagnetic relay

The principle of electromagnetic relay is: 1. The electromagnetic relay is composed of a coil and an iron core; 2. When enough current is passed into the coil to reach the pull-in current threshold of the relay, the iron core is acted upon by sufficient magnetic force. It is attracted to move in the direction of the coil, causing the contacts of the relay to close; 3. When the current in the coil is not enough to maintain the pull-in state of the relay, the iron core loses its magnetic force and returns to the original position, and the contacts return to the open state.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

An electromagnetic relay is a switching device that uses the principle of electromagnetism. It controls the switching action of a larger current or voltage by controlling a smaller current or voltage signal. Its basic working principle is as follows:

1. Electromagnetic excitation: The electromagnetic relay is composed of a coil and an iron core. When a current is passed through the coil, the coil generates a magnetic field, and the magnetic field passes through the iron core, causing the iron core to be magnetized.

2. Pull-in state: When enough current flows into the coil to reach the pull-in current threshold of the relay, the iron core is acted upon by sufficient magnetic force and is attracted to move in the direction of the coil, causing The relay contacts are closed.

3. Off state: When the current in the coil is not enough to maintain the relay's pull-in state, the iron core loses its magnetic force and returns to the original position, and the contacts return to the off state.

Through the above principles, electromagnetic relays can control large current or high-power circuits. When the signal in the control circuit meets specific conditions, the coil of the relay generates a magnetic field, which attracts the iron core and closes the contacts, thereby achieving on-off control of the controlled circuit.

Electromagnetic relays are widely used in various electrical equipment and automation systems, such as lighting and motor control in home circuits, automatic control in industrial equipment, and protection and monitoring of power systems. Its advantages include high reliability, good isolation, large capacity, etc.

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