Understanding the Basics of Power Relays: A Guide to the Omron G2RV-SL700

Power relays play a critical role in ensuring the safety and reliability of electrical systems by controlling the flow of electricity. This blog will comprehensively overview power relays, including their definition, functionality, and typical applications. Furthermore, we will use the Omron G2RV-SL700 power relay as a prime example to demonstrate these fundamental concepts.

What is a Power Relay?

power relay is a highly reliable and efficient device that effectively controls the opening or closing of a set of contacts by utilizing an electromagnetic coil. The coil generates a strong magnetic field when an electric current flows through it, which pulls a movable armature with great precision. This armature is intricately linked to one or more contact sets that can be opened or closed with utmost efficiency and accuracy, depending on the position of the armature.

Power relays are crucial for controlling the flow of electricity within a circuit, allowing the switching on and off of high-power equipment like heaters, lights, and motors. Power relays add a layer of safety and protection by dividing low-voltage control circuits from high-voltage power circuits. Power relays are a crucial part of any electrical system due to their capacity to regulate the flow of electricity.

How Does a Power Relay Work?

To fully comprehend the functionality of a power relay, it is essential to delve into its internal components. A common power relay comprises an electromagnetic coil, an armature, and one or more sets of contacts. When a current flows through the coil, it generates a magnetic field that pulls the armature towards it. The armature is connected to one or more sets of contacts, which can be opened or closed depending on the position of the armature.

It's crucial to remember that when working with a normally open (NO) power relay, the contacts will remain open until a current flows through the coil. This current will generate a magnetic field that will attract the armature and close the contacts, allowing electricity to flow through the circuit. 

Conversely, with a normally closed (NC) power relay, the contacts will remain closed until a current flows through the coil, creating a magnetic field that will attract the armature and open the contacts, interrupting the flow of electricity through the circuit.

The Omron G2RV-SL700 Power Relay

Learn about the Omron G2RV-SL700 power relay and its fundamental concepts.

The Omron G2RV-SL700 is a slim industrial power relay perfect for control panel application. Its single pole double throw (SPDT) contact form can easily handle up to 1500 VA for resistive loads and 500 VA for inductive loads. This relay is designed to be mounted on a DIN rail and has screw terminal connections, making installation a breeze. And at only 6.2 mm in size, it's an ideal choice for tight spaces.

The G2RV-SL700 stands out because its slim design allows multiple relays to be mounted side by side on a DIN rail. It also features an LED indicator, providing visual confirmation of its operation. Trust this relay is the perfect choice for your industrial needs.

Common Applications of Power Relays

Power relays are a reliable and commonly used industrial automation solution for controlling electricity distribution to various components. These versatile devices can activate or deactivate various equipment, such as motors, lights, heaters, and many others.

For an HVAC system, for instance, by utilizing a power relay, you can effectively regulate the operation of an electric heater. The process is quite simple: If the thermostat detects that the temperature has dipped below a specific level, it will signal the power relay to close its contacts and activate the heater. Similarly, when the temperature exceeds the designated set point, the thermostat will send a signal to open the contacts and switch off the heater. This ensures efficient and safe operation of the HVAC system.

Also, power relays are of utmost importance in safety systems as they separate high-voltage circuits from low-voltage control circuits. In case of an emergency stop, pressing the designated button will trigger the contacts of a power relay to open, resulting in the discontinuation of the power supply to all machinery located in the affected area.


Power relays are essential in various electrical systems, providing a reliable and secure way to regulate the flow of electricity. For instance, there is the Omron G2RV-SL700, a slim industrial power relay specifically designed for control panel applications. By understanding how power relays function and their typical applications, you can make informed choices when selecting and implementing these components in your projects.

SHOP the Omron G2RV-SL700 here: Omron G2RV-SL700 | Shop Now! (industrialelectricalwarehouse.com)

Omron g2rv-sl700Power relay

Leave a comment

All comments are moderated before being published


Gain Exclusive Access to New Products, New Articles and Special Promotions! Sign up and get 10% OFF your first order!