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What Is A Contactor?

Introduction To  Contactor

An electric contactor is a device you can use to switch on or off an electric circuit. It uses the principle of electromagnetism to open and close a switch.

You can install the contactors in the electrical panel of a building. People have begun using them for industrial purposes, such as controlling the flow of water, gas, or steam.

Now that you have understood contactors, let’s look at the different types of contactors and how it works.

This article will explore how contactors work and their different types. We will also discuss their applications and use them in various industries such as construction, manufacturing, and power generation. Many companies use it to control the amount of power supplied to the load. You can find electric contactors in many different types of electrical equipment. That includes power plants, hydroelectric dams, and industrial manufacturing facilities. Technicians also use the AC Unit Contactor to control the amount of power supplied to the load in such devices as motors, transformers, and generators.

Contactors come in many different shapes and sizes, depending on their application. The most common type is a rotating magnetic field where manufacturers wound two coils around a ferromagnetic iron or steel core. You can use these contactors in many applications, such as industrial motors, electric motors, generators, and refrigerators.

Why is Contactor Used?

Now you may ask, why do we need to use a contactor? Isn’t connecting the motor to the PLC (Programmable Logic Controller) possible? But you’ll have to get in touch with the team of mechanical engineers. Well, the short answer is no. Why? While you must keep your PLC (Programmable Logic Controller) safe and secure, you don’t want to connect it directly to a high voltage electric motor. If you are operating an engine in the PLC, it would be harmful if there was an electrical surge on the motor’s side.

We control the motors and drives remotely for a more efficient process, and it doesn’t require someone to work directly with an electrical motor. What do we mean by indirectly, you ask? There are two common ways we connect the PLC output to a coil: either with a 24-volt DC signal or using direct current.

Once it energises the coil, it will create an electromagnetic field. This electromagnetic field then causes all three black plastic housings to close, and that’s how all the 3-phase power will reach the motor and start it.

There is no connection between the coil and the contactors. Instead, you can connect the contactors to the loop and open and close as it changes its magnetic field.

When you don’t energise the coil, it’s in a normal state. However, sending a 24-volt DC signal from the PLC will turn on and start the motor.

The use of a PLC for monitoring connected to the motor is secure. That’s how you can turn on and off a big high-voltage electrical engine indirectly while ensuring you don’t damage your PLC card if there are any electrical surges. So, that’s why you can use an AC contactor.


Application of a Contactor

Electric contactors are also known as circuit breakers or fuses. They include a coil of wire (the primary) and a movable contactor (the secondary). When current flows through the primary coil, it creates a magnetic field that moves the secondary contactor into the circuit breaker. However, the secondary contactor cannot move until it has moved past a fixed point on its way to completing its path. This point is called the trip point and interrupts the flow of electricity in the circuit breaker.

Typically, you can use the electric contactor in residential, commercial and industrial settings. Moreover, you can find them commonly in homes, where you can use them to control electricity flow for lighting or heating devices. However, people widely use it in commercial and industrial settings for safety purposes.

You can also find an electric contactor outside a building where it may serve as a power source for lights or other devices that require electricity. Keeping these devices up to date can avoid added expenses and inconvenience by avoiding a power outage.

The contactor has many applications outside of just electrical circuits because you can use them for other purposes, such as controlling the flow of electricity.

The contactor is a primary device that can provide a certain amount of electricity to a circuit. When the voltage on the power supply line goes above the voltages on either side of the contactor, it closes and stops allowing current to flow through it. That enables electrons to move from one conductor to another and eventually reach the ground.

What is the Difference Between a Contactor and a Relay?

Now that you know why we use a contactor, it would be helpful to understand how a contactor is different from a relay service provider. Contactors offer efficient and flexible options for high-volume requirements, whereas relay services are for emergency purposes.

Or, you may ask if we cannot use a relay in place of a contactor to turn on the motor here instead. The answer to this question is No!

A relay is a specialised device that allows you to switch two circuits. They have a coil and some point or connection at one end that you can close to allow current flow through the circuit or open so no current flows. When you activate this, the contacts will close. That is called the contactor relay and works like a contactor.

But here is the difference. You can use the relays usually for smaller devices with lower current and voltage rates. Moreover, you can use a magnetic contactor for more significant devices with high current and voltage rates.

So, relays allow small devices such as lamps and switches to operate, and you can use the contactors for larger ones such as pumps, motors, valves.

Available Products

GYHC-20 Household Modular AC Contactor

GYHC 20 2P 1NO1NC 2 ac contactor

This contactor utilises a new technological platform and implements automated production and material testing to make advanced-level contacts. You can use this contactor for lighting, rolling curtains, ventilation, and many other micro-inductive load surroundings.

GYHC-16 Household Modular AC Contactor

GYHC 16 2P 2NC 2 ac contactor

This contactor has many features that can make your lives easier. It uses advanced technologies like 3D printing, simulation analysis, and 3D design that you can use for many product developments. It has four control voltages, 11 contact types, and 6-segment current features that can meet your demands for market segments.


Electric contactors are the best choice for most industrial applications. They can reduce electricity costs by up to 80% and improve efficiency by 30%. It is an excellent option for a residential application to save energy. The benefits of them include:

  • It is easy and inexpensive to install.
  • You can install them indoors or outdoors.
  • You don’t need to have any electrical experience.
  • There are no cords or wires that will need maintenance to function correctly.

Now that you’ve learned about Geya.net, it’s time for you to order a fully functional electrical contactor. The website that sells electrical contactors and where you may buy one immediately. You may receive top quality and economical things with the company’s assistance at a reasonable price. It will ensure that you fully electrify every moment and that you will never experience another power outage!

Picture of William

I am William, Electrical Engineering Author. Dedicated to writing technical articles on Timer Relay, Monitoring Relay, Surge Protection Device and other electrical devices. With 7 years of writing experience, I am committed to providing accurate and in-depth expertise to my readers.

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