Everything You Need To Know About AC Contactor

AC contactors are one of the most important control devices in the electric power system and are common in industries and commerce. They are equally vital in managing the power flow of instruments with a view to achieving secure functionality. Whether you’re here asking what an AC contactor is, how it works, or why it is crucial for your system, this article will be of great help. The blog will also explain various types of AC contactors and their uses.

What is an AC Contractor?

AC contactor refers to a device that is employed in regulating the electrical circuit by breaking and making the circuit on the basis of an AC current. It is intended for high-power applications and is common in circuits that require a large current to be turned on and off. AC control contactors have found their application in nearly all fields, revolving round HVAC, industrial applications, and lighting applications.

AC contactors are considered critical mainly because they enable the management of electrical loads in a manner that does not require the use of hands. It minimizes the chances of human interference, mainly in the electrical systems and operations, making them run efficiently and safely. Also, it is noteworthy that AC contactors are capable of remote control, which makes the control of electrical systems more efficient.

How AC Contractor Works?

Another critical aspect that will help understand the relevance of an AC contactor is identifying how it operates. An AC contactor working is based on the electromagnetic principle and consists of a contactor base, an electromagnet, a movable contact arm, and fixed contact points. It consists of three main components: a wide range of current, the grinder coil, the contacts and the enclosure.

AC Contactor Working Principle

• Coil Activation: In the state when an electrical current flows through the coil of the AC contactor, it develops a magnetic field. This magnetic field, as you know, attracts a plunger or armature to the coil, making the contacts too close.

• Contact Closure: AC contactor’s contacts are generally in the open position whenever the coil is deactivated or unplugged. Due to the interaction of the magnetic field, the movements of the plunger lift the contacts and hence offer a shut that creates a circuit with a current that is channeled to a load.

• Circuit Interruption: When this happens, the energizing is ceased. Thus, the magnetic field is reduced, and the plunger goes back to its initial position. This action opens the contacts and, therefore, breaks the circuit and halts the passage of electricity to the load.

This makes the design and working of the AC contactor very simple and thus, it forms a durable part of most electrical systems. Nevertheless, the type of contractor that you select depends on the specific application that you want it for.

Types of AC Contactors

The two main types are the single-pole AC contactor and the double-pole AC contactor.

Single Pole AC Contactor

A single pole AC contactor has one set of contacts which works a single electrical circuit. It is mainly implemented in those cases where the control of only one phase of the powering is required. Single-pole AC contactors are usually used in residential heat pumps and other uses that are of low power.

• Advantages: They are usually less complex in terms of structures, cheaper and easy to fix as compared to the traditional alternatives.

• Disadvantages: In its application, single pole contactors are restricted to the switching of one circuit only. Hence, they are inferior to the double pole contactors.

Double Pole AC Contactor

The double pole AC contactor has four contact points and has the capability to control two different circuits at a time. This makes it suitable for applications that involve the management of several phases or circuits, for instance, in large air conditioning systems and large mechanical systems.

• Advantages: Double-pole contactors offer more control and versatility, which makes them suitable for arrest complex work than single-pole contactors.

• Disadvantages: They usually cost more and also occupy more installation space than the single pole contactors.

In the process of selecting between the single pole AC contactor and the double pole AC contactor, it is important to factor in the particular needs of the application that you have in mind, especially the number of circuits that have to be controlled, as well as power availability.

Applications of AC Contactors

AC contactors are widely applied in numerous fields and industries because they allow for controlling heavy electrical loads while ensuring safety. Some of the most common applications include:

HVAC Systems

AC contactors are utilized in the heating, ventilation, and air conditioning commonly referred to as HVAC systems. It regulates the distribution of the electric current to the compressors, fans and other parts of the system to provide optimized performance with safety precautions. AC contactors, namely, single-pole AC contactors and double-pole AC contactors, are used in HVAC depending on the capacity of the HVAC.

Industrial Machinery

In industries, AC contactors are often employed to regulate massive apparatuses such as motors and other appliances. They regulate the amounts of power needed to run motors, pumps, and other large equipment so that specific control over the concerned apparatus can be achieved. AC contactors are used in industries that call for consistent functioning of equipment without any hindrance due to their durable and reliable nature.

Lighting Systems

AC contactors are also applied on commercial and industrial lighting control circuits. These are used to switch on/off several groups of lights at a go. Thus, they are used for control of lighting in large areas such as factories, warehouses, and large office buildings. This enables strategic control of the light, thus conserving energy and, in the process, minimizing costs.

Also Read: Electrical Contactors: How they work and what are they used for?

Summing Up

For anyone involved in designing, maintaining, or operating electrical systems, knowledge of AC contactors is invaluable. By selecting the right contractor, you can ensure the safety, efficiency, and reliability of your electrical installations, making it a worthwhile investment for any application. Explore the wide range of AC contractors at our eShop of Lauritz Knudsen Electrical and Automation to get the most competitive AC Contractor price without compromising on quality.