CONTACTOR

Product description

AC contactor is an electrical control device widely used in automation control systems for remote connection and disconnection of AC power circuits. It mainly consists of an electromagnetic system, a contact system, an arc extinguishing device, and auxiliary components.
When the electromagnetic system is powered on, the generated magnetic field will attract the contacts to close, thereby connecting the circuit;
When the power is cut off, the magnetic field disappears, and the contacts separate by spring force or other mechanical devices, disconnecting the circuit.

The MINGTUO LC1D AC Contactor Series provides switching that is reliable and efficient for various control and protection applications of AC. Using high-quality components of an electromagnet and contacts that are wear-resistant, the contactors keep very good electrical performance even after a long service life. Their small design and modular accessory layout allow them to be the perfect solution for integration into industrial machines, control cabinets, and automated systems.

Working principle:

Working principle: The working principle of an AC contactor is based on electromagnetic effects, and its core function is to control the power on and off of the electromagnetic coil to achieve the closure and disconnection of the main contact, thereby controlling the connection and disconnection of the load circuit. AC contactors are usually equipped with auxiliary contacts for control or signal transmission. Auxiliary contacts can be of the normally open (NO) or normally closed (NC) type, which change state with the action of the main contact and are used to achieve interlocking, signal indication, or other control functions.

General Product Information

• Place of Origin: 5th Floor, No. 3 Jinghong West Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province
• Brand Name: MINGTUO
• Model Number: AC Contactors
• Certification: ISO, CE, RoHS

Commercial Terms

Specification Details:

Minimum Order: Quantity 1 

Price:USD 3-9

Packaging:Carton

Delivery Time:Within 15 days

Payment Terms:100% Prepaid / 70%-30% / 80%-20%

Supply Ability:Ready to ship

Core technological advantages

• Using high-quality silver alloy contacts, it is arc resistant, wear-resistant, and has an electrical lifespan of over one million cycles.
• The mechanical structure is sturdy, with up to tens of millions of movements, suitable for frequent start stop scenarios.

• Low power consumption of the coil, energy-saving design (such as AC coil with energy-saving circuit).
• The contact pressure is reduced, the heat generation is small, and the power loss is minimized.

• Compliant with international safety certifications such as CCC, CE, UL, etc.
• The arc extinguishing system is efficient, has strong breaking ability, and is resistant to short-circuit current impact.
• Good insulation performance, dust-proof and anti electric shock design.

• Can integrate accessories such as auxiliary contacts, delay modules, mechanical interlocks, etc.

Key specifications

Rated Current	9A–95A	Control Voltage	AC/DC 24V–500V
Rated Operating Voltage	AC 220V / 380V / 660V	Mechanical Life	10–30 million cycles
Pole Options	3-Pole / 4-Pole	Electrical Life	1–3 million cycles

Technical Features

• Coil for the electromagnet which is energy saving
• Contact points are made of a high conductivity silver alloy
• Designed to be fully supported with auxiliary accessories
• Mounting can either be 35mm DIN-rail or by screw
• High electrical life and a strong break capacity
• A modular design that saves space and allows for small panels

Main Applications

Motor Control

• Start/stop operations for three-phase motors
• Forward/reverse control circuits
• Pumps, compressors, conveyors
• Industrial machinery and mechanical drives

HVAC & Environmental Systems

• Air conditioning compressors
• Ventilation and cooling fans
• Heating equipment control
• Chillers and AHU units

Industrial Automation

• Automated production equipment
• PLC and control system integration
• Robotics and process control
• Assembly line power management

Power Distribution

• Lighting circuit control
• Heating element switching
• Capacitor bank and transformer switching
• Power factor correction systems

Specialized Applications

• Elevators, cranes, and hoists
• Welding machines
• Data center power routing
• Renewable energy equipment

Product composition 

Test video

Coil detection

• Resistance measurement: Use a multimeter to measure the resistance at both ends of the coil, which should be approximately the same as the nominal value of the model or a new product of the same model. Both low resistance (short circuit) and infinite resistance (open circuit) require replacement.
• Insulation measurement: Use a megohmmeter (500V range) to measure the insulation resistance of the coil pins to the frame (ground), which should be ≥ 1M Ω.

Main contact detection

• On/off measurement: When the contact is disconnected, use a multimeter to measure the on/off range of each pair of main contacts, and it should be an open circuit (infinite resistance). Manually press down on the armature to close the contacts, which should display conductivity (resistance close to 0 Ω). Ensure good synchronization of the three-phase contacts in terms of on/off.

Insulation measurement

• Inter phase insulation: When the contacts are closed, use a megohmmeter to measure the insulation resistance between different phase contacts (such as L1 to L2, L2 to L3, L1 to L3), which should be ≥ 1M Ω.
• Ground insulation: Measure the insulation resistance of each phase contact to the contactor metal frame, which should be ≥ 1M Ω.

Auxiliary contact detection

• The method is the same as above. Use a multimeter to measure whether the normally open (NO) and normally closed (NC) contact states are correctly switched and whether the contact is good.

Recovery installation check

• After all tests are completed, reinstall the arc extinguishing cover and tighten all screws.
• Without connecting the main circuit, only power on/off the control coil, repeat the operation several times, listen to the sound, and observe whether the action is smooth.
• Finally, conduct an overall load test.

Service Support

• A large range of auxiliary modules and add-on accessories
• Documents of international certification
• 2 years warranty for all models
• Complete product manuals
• Custom configurations available upon request

Quick Detail Keywords

• AC Contactor
• Electrical Contactor
• Magnetic Contactor
• Motor Contactor
• Power Contactor
• Electromagnetic Switch
• Industrial Contactor
• 3-Pole/4-Pole Contactor
• 40A AC Contactor
• 380V Contactor
• Power Relay
• Industrial Power Controller

AC Contactor — Core Functions & Usage Scenarios

AC contactors are the key elements in power control systems that enable remote and automated switching of high-power loads by low-power control circuits. Due to their quick reaction, long service life, and safe separation capability, they are the perfect choice for those applications which require frequent switching and reliable protection.

Main Benefits

• High-current circuits controlled in a safe way
• Electrical isolation between control and power circuits
• Ability to be switched at high frequency
• Automation and control wiring made simple
• Overall equipment safety and lifespan ​‍​‌‍​‍‌​‍​‌‍​‍‌enhanced

 

SPECIFICATIONS

PRODUCT MODEL	WORKING CURRENT	RATED POWER		CONVENTIONAL THERMAL CURRENT
		220/240V	380/400V
LC1D09	9A	2.2KW	4KW	25A
LC1D12	12A	3KW	5.5KW	25A
LC1D18	18A	4KW	7.5KW	32A
LC1D25	25A	5.5KW	11KW	40A
LC1D32	32A	7.5KW	15KW	50A
LC1D38	38A	9KW	18.5KW	50A
LC1D40	40A	11KW	18.5KW	60A
LC1D50	50A	15KW	22KW	80A
LC1D65	65A	18.5KW	30KW	80A
LC1D85	85A	22KW	37KW	125A
LC1D95	95A	25KW	45KW	125A

PRODUCT DIMENSIONS

Production line

Process 1: Preparation and Inspection of Components

Workers manually sort all components such as iron cores, coils, contacts, springs, plastic shells, etc., and conduct visual inspections.

Process 2: Assemble the core components

Iron core assembly: Manually install E-type silicon steel sheets and short-circuit rings, and may use simple fixtures to ensure alignment.

Coil installation: Insert the wound coil into the iron core.

Contact system assembly: Manually install the moving and stationary contacts onto the contact support and wiring terminals, which may require manual riveting.

Process 3: Final Assembly

Workers manually assemble various parts such as the action mechanism, electromagnetic system, contact system, and arc extinguishing cover onto the plastic shell or base plate. Tools such as screwdrivers and pneumatic screwdrivers are required to tighten the screws.

Process 4: Manual testing

Mechanical characteristic test: Workers manually press the contactor to check whether the action is flexible and stuck.

Simple electrical test: Use temporary wiring, connect low voltage electricity, listen for the sound of suction/release, and use a multimeter to check the continuity of the contacts.

Process 5: Cleaning, Labeling, and Packaging

Manually clean the appearance, paste model labels and certification labels, and finally manually pack the boxes.

Packing

Inner packaging

Shockproof material
Material: foam, bubble film, etc
Placement: Place evenly around the circuit breaker, at the top and bottom

External packaging

Carton

Material: High strength corrugated cardboard box

Carton sealing

Method: Seal with tape or strapping

Requirement: Ensure a secure seal to prevent cracking of the box

Identification and labeling

Content:Product model, quantity, weight, manufacturer, transportation label (such as fragile, upward, moisture-proof, etc.)
Location: Clearly printed on the outside of the cardboard box.

Featuring​‍​‌‍​‍‌​‍​‌‍​‍‌ precisely engineered high-precision components and sophisticated electromagnetic design, our AC contactors along with the 3-Pole Electrical Power Relay series are the perfect solution for your power switching needs. They boast a long service life, excellent electrical durability, and stable operation even when subjected to harsh industrial environments. These are the key features which give our products an edge over the rest of the world.

1. Exceptional Technical Performance

• Outstanding mechanical endurance of up to 30 million operations
• Electrical lifetime of up to 3 million switching cycles at rated load
• High breaking capacity of 10×Ie, thus greatly enhancing the stability of the device's performance in heavy-load scenarios
• Coil design that is very energy-efficient, with extremely low consumption (≤8VA)
• Ensured switching operation even under very frequent usage

2. Upgraded Contact System

• Using high-grade silver cadmium oxide (AgCdO) contact material resulting in a highly arc-resistant
• Dual-breakpoint contact configuration for better conductivity and safer isolation
• Better thermal stability, oxidation resistance, and long-term wear protection
• Contact resistance now is extremely stable and maintained at less than 100 mΩ
• Fully optimized arc suppression guarantees longer service life and less downtime

3. Improved Safety & Protection

• Multi-layer arc chute ensures a safe arc-extinguishing operation
• In addition, the structure is dust-resistant and pollution-resistant that can be used in tough industrial environments
• There is an optional IP65 protection level for high-protection applications
• Load endurance is approximately 8 to 10 times the rated current
• The sturdy insulating system greatly reduces the risk of electrical hazards during heavy-duty operation

4. Intelligent Control & System Integration

• Wide range of control voltages: 24–500V AC/DC
• Response time is very fast and is less than 25 ms thus quickly determining the switching action
• The unit is fully compatible with modular auxiliary contact blocks and timer relays
• Installation is very versatile through DIN rail or panel mounting
• An irrigation system, motor protection circuits, and HVAC equipment are just a few examples of where this unit can be implemented

5. Trusted Quality Assurance

Inspection is done at the factory and up to the very last unit, the checks include:

• Dielectric strength test: 2500V for 1 minute
• Testing for mechanical operation and endurance
• Thermal evaluation and temperature rise verification
• Conforming to the international standards IEC 60947-4-1 and GB 14048.4
• Long-term performance backed by a 3-year warranty

6. Extensive Customization Options

• Non-standard coil voltages can be arranged for special requirements
• Contact combinations and auxiliary modules that can be customized
• On-demand production and 7-day fast delivery options
• Brand customization facilitated through professional OEM / ODM ​‍​‌‍​‍‌​‍​‌‍​‍‌support

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