China Ac Contactor Manufacturers Suppliers Factory

KINO ELECTRICS CO. LTD：Your Professional Ac Contactor Manufacturer !

KINO was established in 2005 and is a professional manufacturer of low voltage electrical device. We are specialized in manufacturing the mini circuit breakers, molded case circuit breakers, ac contactors, over load relays, photovoltaic series breakers and other related electrical baskets of products. Our mission is to be a professional manufacturer for worldwide customers with high quality and best service.

Rich Products

Our company can produce mini circuit breakers, isolating switches, leakage circuit breakers, single-phase leakage circuit breakers, three-phase leakage circuit breakers, lightning arresters, molded case circuit breakers, distribution boxes, etc.

Advanced Equipment

We have 1600M² of work space and 5 production lines, as well as various assembly, calibration, packaging and other equipment.

Versatile Products

Our mini circuit breaker is an overcurrent protection device used in residential, commercial and industrial electrical systems; and the isolating switch is an important switching device in the power system. The isolating switch can be used in conjunction with other control equipment to realize the control of the power system.

Leading Service

We have many years of industry experience and a complete production management, quality supervision, sales service operation system. Whether you want to buy a mini circuit breaker or a molded case circuit breaker, just send your requirements via email and we can customize the product for you.

Cjx2 1210 Contactor
Unit Price. $2.4~$3.3/Unit
Cjx2 1810 Contactor
Unit Price. $2.6~$3.5/Unit
Cjx2 2510
Unit Price. $3.36~$4.6/Unit
Cjx2 3210
Unit Price. $3.5~$4.8/Unit
Cjx2 4011
Unit Price. $8.5~$11.5/Unit
Cjx2 5011
Unit Price. $9~$12.3/Unit
Cjx2 6511
Unit Price. $10~$13.7/Unit
Cjx2 8011
Unit Price. $13.1~$18/Unit
Cjx2 9511
Unit Price. $15.4~$21.2/Unit

What is Ac Contactor？

An ac contactor is a vital component in electrical systems that control the flow of electricity to various devices and equipment. It is an electromechanical switch used to make or break the electrical circuit in an alternating current (AC) system. Ac contactors are commonly found in air conditioning units, heating systems, lighting systems, and industrial machinery.

Types of Ac Contactor

An AC contactor is an electromechanical switching device designed to switch AC loads on/off. It is used for switching high-current AC loads. There are several types of ac contactors available, each designed to meet specific requirements of various applications. Here are three common types.

Definite Purpose Contactors

Definite purpose contactors are specialized contactors designed for specific applications. They are commonly used in various HVAC (heating, ventilation, and air conditioning) systems, refrigeration units, and other industrial equipment. These contactors are built to handle a particular load capacity and are optimized for specific operating conditions, making them reliable and efficient in their designated applications.

Lighting Contactors

As the name suggests, lighting contactors are designed specifically for controlling lighting systems. They are commonly used in commercial and public spaces where there is a need for centralized control of lighting. Lighting contactors allow remote switching of lights, control multiple circuits, and provide safety features like overload protection and short circuit protection.

Power Contactors

Power contactors are heavy-duty contactors used in industrial and commercial applications where there is a necessity for high-load switching. They are capable of handling large motor loads, heavy electrical machinery, and other power-consuming devices. Power contactors are designed to withstand high voltages, operate under challenging conditions, and ensure efficient and safe performance.

Characteristics of Ac Contactor

An ac contactor is an electromechanical device used in electrical systems to control electrical power. It has several important characteristics that make it a key part in many electrical circuits.

Switching Frequency
One of the key functions of an ac contactor is its ability to open and close electrical wires frequently and reliably. Unlike manual opening and closing circuits, Ac contactors operate using an electromagnetic field pull-in mechanism. This feature ensures greater efficiency and flexibility, allowing the contactor to meet the needs of complex electrical systems.

Large Current Control
Ac contactors have the unique ability to control large current loads with small currents. This attribute makes them indispensable when handling heavy electrical equipment in a variety of industrial, commercial and residential environments. Ac contactors prevent equipment damage and the risk of electrical failures by effectively controlling current, ensuring the safe operation of connected equipment.

Overload Protection
When used in conjunction with thermal relays, Ac contactors provide an extra layer of protection against equipment overload. When the connected load exceeds the rated capacity, the thermal relay detects excessive temperature rise and triggers the Ac contactor to disconnect the power supply. This mechanism protects connected devices from potential damage caused by prolonged overload.

Simultaneous Control of Multiple Load Lines
Ac contactors have the ability to open and close multiple load lines simultaneously. This feature makes them efficient and ideal for applications where multiple devices or systems need to be controlled simultaneously. By simplifying the control process, Ac contactors save time and effort and minimize the complexity of managing large numbers of load lines individually.

Self-Locking Mechanism
The ac contactor uses a self-locking mechanism that keeps the contacts closed even after the electromagnetic field is deactivated. This feature ensures that current flows continuously and eliminates the need for constant power to hold the contacts in place. It also reduces power consumption and improves the overall reliability of the control system.

Durability and Lifespan
Ac contactors are designed to withstand frequent switching operations and harsh electrical environments. They are made from sturdy materials and advanced engineering for exceptional durability and longevity. This reliability reduces maintenance costs and increases system uptime, making ac contactors the first choice for critical applications.

Working Principle of Ac Contactor

When it comes to the functionality of electrical appliances, ac contactors play a significant role. They are essential components in alternating current (AC) systems, ensuring the safe and efficient control of electrical power. Ac contactors are widely used in various industrial and commercial applications, providing reliable switching and control capabilities. Understanding the working principle of an ac contactor is crucial to grasp its operational functionalities.

01.

Coil Energization

When a control voltage is applied to the coil, an electrical current passes through it. This current generates a magnetic field around the coil, which intensifies with the increase in current flow. The coil is designed to have strong electromagnetic properties to ensure sufficient force for the contacts to move.

02.

Contact Attraction

Under the influence of the magnetic field, the movable contact, attached to an armature, gets attracted towards the stationary contact. As the magnetic force grows stronger, the contacts rapidly approach each other until they come into physical contact.

03.

Circuit Completion

When the movable contact touches the stationary contact, the circuit is complete. This allows the electrical current to flow freely through the main contacts, enabling the functioning of the connected electrical load. The ac contactor remains in this position until the control voltage is removed.

04.

Coil De-energization

When the control voltage is disconnected or interrupted, the magnetic field generated by the coil weakens. As a result, the contacts lose the attractive force, and the movable contact moves away from the stationary contact, breaking the circuit. The ac contactor returns to its initial position, ready for the next operation.

Components of Ac Contactor

Ac contactor is one of the most commonly used low-voltage control appliances in power drag and automatic control systems. As an executive element, it is used to connect and disconnect lines, or to frequently control the operation of electric motors and other equipment. A typical ac contactor is comprised of several integral components that work together to ensure seamless operation.

Coil

The ac contactor coil is responsible for creating the magnetic field that causes movement and the closing of power contacts. Wound around an E-shaped magnetic core, it receives power from the control circuit. The coil is usually resin bonded to protect it from the effects of moisture and other damage.

Contacts

Contacts are parts that close or open to switch or break the flow of current, and categorized as either static or moving. Moving contacts attach to the armature and move when the coil is energized. Static contacts remain stationary. There’s also usually an auxiliary contact included. This serves as the feedback contact. Its function is to help the control hardware monitor the ac contactor’s health and working.

Terminals

Ac contactor comes with terminals or connection points for attaching the wires that will go into it. These are usually labeled to make them identifiable based on their function. A typical ac contactor will have these terminals:
A1 and A2: to connect the power supply, also called coil terminals.
LI, L2, and L3: to connect the high power supply.
T1, T2, and T3: to connect the device that’s being powered.

Housing

The housing is the ac contactor’s enclosure. It forms the protective covering that shields the mentioned parts, and must be strong enough to prevent damage. Since the device works with high voltages and high currents, the housing is also made using an insulating material and securely sealed. This is commonly nylon 6, thermosetting plastic, polycarbonate, and other similar materials.

Applications of Ac Contactor

Ac contactors are widely utilized in various industrial and commercial applications due to their reliability and robustness. Here are some common applications of ac contactors.

Lighting Control Systems
Lighting contactors are widely used in commercial buildings, stadiums, theaters, and outdoor lighting systems. They allow centralized control of lighting and enable features like timed switching, dimming controls, and user-defined lighting scenarios. Lighting contactors provide energy efficiency and contribute to cost savings.

Residential HVAC Systems
Ac contactors are commonly used in residential heating, ventilation, and air conditioning systems. They play a crucial role in controlling the compressor, fan, and other components of an HVAC system. Ac contactors enable efficient operation and enhance the safety of HVAC systems, particularly in managing heavy electrical loads.

Power Distribution
Power contactors are an essential part of power distribution systems, where they handle high voltage and current levels. They are used in substations, distribution panels, and switchgear systems to control and distribute power to various consumers. Power contactors ensure efficient power management and protection against short circuits and overloads.

Industrial Machinery
Ac contactors are extensively used in industrial machinery and equipment that require efficient control of electrical power. They are employed in motor control centers, conveyor systems, pumps, compressors, and various other heavy-duty machinery. Ac contactors ensure safe and reliable operations, preventing any damage to the machinery.

Automotive Applications
Ac contactors are utilized in electric vehicles (EVs) and hybrid electric vehicles (HEVs) for multiple purposes. They control the power flow from the battery to various systems like the motor, air conditioning, and charging circuits. Ac contactors ensure the safety of operations and protect the vehicle against electrical faults.

Factors to Consider When Selecting an Ac Contactor

Ac contactors are an essential component in many electrical systems. They control the flow of power to a load and protect against overloads and short circuits. It’s important to choose the right type of ac contactor for your specific needs to ensure proper performance and safety. Considering the widespread use of ac contactors, there are now different varieties of ac contactors available today. There are some key factors to consider when selecting an ac contactor below.

01/

Current Rating
Select an ac contactor with a current rating higher than that of the system it will serve. It should have the capacity to manage both the load current and the initial inrush current during system startup.

02/

Number of Poles
Ac contactors are typically available in 3-pole and 4-pole configurations. The choice between them depends on the nature of the load and the control circuit requirements. For example, 3-pole ac contactors are suitable for three-phase systems, whereas 4-pole variants can be used in 3-phase 4-wire systems or 1-phase 2-wire systems.

03/

Lifespan
Prioritize longevity when selecting an ac contactor. Consider the mechanical and electrical lifespan of the product. Mechanical life indicates the number of switching cycles before wear impacts performance, while electrical life refers to the number of operations under load. Opt for a contactor rated for millions of cycles to ensure durability.

04/

Size and Mounting
Evaluate the installation location in the control panel to choose an ac contactor that aligns with your size and mounting requirements.

05/

Price and Budget
While high-quality ac contactors may come at a higher price, they offer enhanced reliability. Research different manufacturers’ products within your specific ratings to find options that suit your budget.

06/

Certifications
Opt for ac contactors with credible certifications like CE and UL, ensuring product quality and safety standards. Check the manufacturer’s product page for certification details.

Maintenance Of Ac Contactors

Regular maintenance of ac contactors is crucial to ensure their proper functioning and prevent unexpected failures. Here are some general guidelines for ac contactor maintenance.

Regular Inspection
Regularly inspect ac contactors for any signs of physical damage, overheating, or discoloration. Check for loose connections and ensure that all parts are in good condition.

Clean Contacts
Dust, dirt, and contaminants can accumulate on the contact surfaces, leading to increased resistance and potential failure. Clean the contacts using a soft brush or compressed air.

Check for Wear
Inspect the contact surfaces for signs of wear, pitting, or erosion. If the contacts are significantly worn, consider replacing them.

Tighten Loose Connections
Ensure that all electrical connections, including terminal screws and lugs, are tight. Loose connections can lead to overheating and increased resistance.

Inspect Coil and Armature
Check the coil and armature for any damage or signs of wear. Ensure that the coil is securely in place and that there is no excessive wear on moving parts.

Lubricate Moving Parts
If the ac contactor has moving parts, such as hinges or levers, lubricate them with an appropriate lubricant to reduce friction and wear.

Check Control Circuits
Verify that the control circuits, including wiring and connections to the coil, are in good condition. Repair or replace any damaged wires or components.

Verify Proper Sizing
Ensure that the ac contactor is appropriately sized for the load it is controlling. Undersized ac contactors can lead to overheating and premature failure.

Check Voltage and Current
Measure voltage and current during operation to ensure that they are within the specified limits. Abnormal values may indicate a problem in the electrical system.

Inspect Enclosure
If the ac contactor is housed in an enclosure, check for proper ventilation and cooling. Ensure that the enclosure is free from obstructions and contaminants.

Test Operation
Test the ac contactor’s operation under normal conditions to ensure that it engages and disengages as expected. Verify the timing and coordination with other components in the system.

Record Maintenance Activities
Keep a maintenance log that includes details of each inspection and any maintenance activities performed. This log can be valuable for tracking the ac contactor’s performance over time.

Follow Manufacturer’s Guidelines
Adhere to the manufacturer’s recommendations and guidelines for maintenance. This may include specific intervals for inspection, cleaning, and replacement of components.

Replace Worn or Damaged Parts
If any components, such as contacts or coils, show significant wear or damage, replace them promptly with parts recommended by the manufacturer.

Consider Thermographic Inspection
Infrared thermographic inspection can help identify overheating issues before they cause a failure. Consider using thermal imaging equipment during maintenance checks.

Frequently Asked Questions

Q: How do I choose an ac contactor?

A: To choose an ac contactor, consider factors like voltage and current ratings matching your application, coil voltage for the control circuit, and the required number of poles. Evaluate environmental conditions for the appropriate enclosure type and determine if auxiliary contacts are necessary. Look for special features such as overload protection or surge suppression. Careful consideration of these factors ensures compatibility and optimal performance.

Q: How often should I replace or service my ac contactor?

A: The lifespan of an ac contactor varies based on usage and environmental conditions. It’s a good practice to inspect it annually and replace it if signs of wear or damage are evident.

Q: What is the use of ac contactor?

A: It is mainly used to control the AC motor in starting, stopping, reversing and regulating speed, and it can also combine with thermal relays or other appropriate protective devices to protect motors from the overload or phase failure likely occurring.

Q: How does an ac contactor protect a circuit?

A: An ac contactor serves as a heavy-duty switch in electrical control circuits,managing the flow of electricity to high-power loads like motors. Using an electromagnetic coil,it connects or disconnects contacts in response to control signals. Energizing the coil closes the contacts, while de-energizing it opens them.

Q: Is an ac contactor a breaker?

A: An ac contactor is a simple switching device, whereas the circuit breaker is a protective system. The primary function of ac contactor is controlling the power. A circuit breaker does the protecting.

Q: How do you prevent ac contactor failure?

A: Ensure the ambient temperature around the ac contactor is maintained within specified levels and avoid any hot spots, as ac contactors are generally energised for very long periods of time.

Q: How long should an ac contactor last?

A: With the right maintenance, a good ac contactor will typically last between 5 – 10 years. During a maintenance service, the technician will check the ac contactor to make sure it is working properly.

Q: When should ac contactor be replaced?

A: Your ac contactor can fail electrically in one of three ways. The coil can become shorted, grounded, or open. Your technician will use a meter to determine the resistance crossing your ac contactor. If the readings are outside of a very narrow range; your ac contactor should be replaced.

Q: How are ac contactors connected?

A: It's done by connecting the hot (phase) wire to one terminal and the neutral wire to the other. In some cases, it is also possible to connect a separate ground wire to the ac contactor. A load, such as a motor or other electrical equipment, is connected to the output terminal or load side of the ac contactor.

Q: What are some common causes of ac contactor failures?

A: Overheating of ac contactor coils is another cause of failure that can result from voltages that are too low or too high, or if contacts fail to open or close due to misalignment, dirt, oxidation, or rust. High ambient temperatures over a long period can cause ac contactor coils to fail, as well.

Q: What causes a noisy ac contactor?

A: Three of the most common causes of these sounds include insufficient current from the control source to pick up the electromagnetic coil, incorrect voltage supply to the coil, and/or debris on the active components, i.e. the pole faces of the armature and yoke.

Q: What are the main components of an ac contactor?

A: An ac contactor or relay will have a coil (to develop a magnetic field when energized), an armature (which is attracted by the electromagnetic coil when energized), and then contacts (which are attached to the armature, and close when the coil energizes).

Q: What causes ac contactor to overheat?

A: There are several basic reasons why an ac contactor overheats, of which these are some examples: The contacts close too slowly or stick at the edge position, so they don't fully achieve the contact position. The contacts suffer serious oxidation, increasing contact resistance and the current passing through it.

Q: How do you troubleshoot an ac contactor?

A: To test the ac contactor, you'll need a multimeter (available at any hardware or big box store). Set it to the “OL” setting. Connect the multimeter to the low-volt terminals on both sides of the ac contactor. If the ac contactor is working properly, the multimeter will show a reading between 5 and 20.

Q: What is the voltage of ac contactor?

A: An ac contactor is an electrical switching device that can switch an electrical circuit on and off. They are available in multiple contact configurations, current/voltage ratings, auxiliary contact configurations, and mounting styles. Their voltage ranges from 12VAC or 12VDC to 690VAC or 440VDC.

Q: Can I replace an ac contactor?

A: While it is technically possible to replace an ac contactor yourself, it is generally recommended that only a qualified electrician perform this task. This is because improper installation of an ac contactor can lead to unsafe conditions and void the manufacturer’s warranty.

As one of the most professional ac contactor manufacturers and suppliers in China, we're featured by quality products and competitive price. Please rest assured to buy ac contactor in stock here and get quotation from our factory. Also, customized service is available.

Send Inquiry