What Is Power Relay?

What Is Power Relay?

A power relay is a device that controls the flow of electricity in a circuit. It is typically used to control a high-powered electrical device, such as an electric motor, from a low-powered switch or circuit. A power relay can also be used to protect an electrical circuit from overload by automatically disconnecting the circuit when the current exceeds a certain level.

Here Are the Different Types of Power Relay

Electromagnetic Relay

An electromagnetic relay is a switch that’s electrically operated. It is used in controlling a circuit by a low-power signal or one signal controlling several circuits. When a current passes through the coil, it creates a magnetic field that activates the armature, and the contacts connect or disconnect the circuit. Electromagnetic relays are used in various applications, including motor controls, home automation, and industrial controls.

Reed Relay

A reed relay is an electromagnetic relay utilizing an electromagnet in controlling multiple switches or one reed switch. A reed switch is a type of switch that is activated by an applied magnetic field. Reed relays are used in various applications, including computer networking, automotive electronics, and industrial controls.

High Voltage Relay

High voltage relays are well-suited for applications with high voltages, such as in electrical power distribution systems. These relays can safely and effectively handle high voltage loads, making them a critical component in many power systems.

Latching Relay

A latching relay is an electromechanical relay used to turn a circuit on or off with a momentary input. An electrical current activates the latching relay through the coil. The coil creates a magnetic field that attracts the armature and changes the position of the switch. The armature is held in the new position by the force of the magnetic field until another current is passed through the coil, which reverses the process and deactivates the relay.

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A latching relay is often used in applications where it is necessary to maintain a circuit in a particular state, such as in a timer circuit. They are also used in security systems and other devices where it is important to prevent accidental activation or deactivation of the device.

Thermal Relay

Thermal relays are those relays in which the de-energizing of the coil is done by the heat developed due to the current flowing through it. The current flowing through the coil produces heat dissipated by convection and radiation. The coil’s temperature rises, and the relay trips when it reaches the operating temperature.

Differential Relay

Differential relays are used in a variety of applications, such as protecting circuit breakers from voltage fluctuations, preventing equipment damage due to voltage imbalances, and more. Differential relays can be used in both AC and DC applications and are available in various voltage and current ratings.


A power relay is an electromagnetic switch operated by a small amount of power that can control a much larger power. It is used in various applications, including motor control, lighting control, and automotive electronics. There are many types of power relays, each with its own uses.