CJX2 AC Contactor

In scenarios such as low-voltage motor control, community equipment control, and engineering equipment control, traditional knife switch control has many difficult-to-solve shortcomings: it cannot achieve remote control, and operators must go to the site to operate, which is time-consuming and labor-intensive; it lacks automatic control functions and cannot be combined with PLC to achieve automated operation, unable to meet modern control requirements; the operation is cumbersome and the failure rate is high, which may cause the motor to fail to start or stop normally, affecting production and equipment operation. CJX2 AC Contactor is specially developed for low-voltage motor control, with remote and automatic control as the core, completely replacing traditional knife switches, making motor control more convenient and reliable, and meeting modern power distribution control requirements.

Technical Specifications

Can it be achieved without on-site operation?

The CJX2 AC Contactor enables remote and automatic dual control. There is no need for operators to go to the site to operate the switch. In the control room, one can easily control the start and stop of the motor. At the same time, it can be combined with PLC to achieve automatic control of the motor, significantly reducing labor costs and improving control efficiency. It is suitable for modern automatic control scenarios and solves the problem of traditional switches requiring on-site operation.

Can it reduce the failure rate of motor control?

The CJX2 AC Contactor operates stably, with precise and reliable opening and closing actions. Its failure rate is much lower than that of ordinary contactors and traditional knife switches. It does not require frequent maintenance and can be stably adapted to motor control needs for a long time, completely solving the concerns of "equipment being prone to failure and the motor being unable to be controlled normally", ensuring the continuous operation of the equipment.

Is it suitable for volume matching of control cabinets and distribution boxes?

We adopt a compact design, with a small size and minimal footprint. It doesn't occupy too much space and can perfectly fit control cabinets and distribution boxes. It can be installed together with other low-voltage control components without the need to expand the cabinet size. This saves installation space and cabinet costs, and solves the problem of "large equipment size and inconvenient installation".

Can the technical parameters be adapted to different motor control requirements?

The CJX2 AC Contactor has all parameters strictly following national standards, covering various scenarios of low-voltage motor control needs. It supports flexible customization and precisely matches the control requirements of different motors. There is no need to worry about parameter mismatch or incompatibility issues. The rated voltage is AV 380V, perfectly adapting to various low-voltage motor control systems in China; the rated frequency is 50Hz, in line with domestic power system standards; the rated current covers 10A to 95A, and can be flexibly selected according to the size of the motor load; it adopts electromagnetic operation mode, with precise operation and fast response, and all parameters comply with the AC Contactor national standards, ensuring professional performance.

Can it enhance control reliability and service life?

Junray Electrical adheres to the original principle of quality. By combining the usage characteristics of low-voltage motor control, it uses professional craftsmanship to ensure the long-term stable operation of CJX2 AC Contactor. Through meticulous details, it eliminates purchasing concerns and extends the service life of the equipment. It is equipped with a reliable electromagnetic operating mechanism, with reliable opening and closing, quick switching, and an extremely low failure rate, ensuring precise and error-free motor start and stop control. It uses high-quality silver contacts with excellent conductivity and wear resistance, effectively extending the service life of the equipment and reducing replacement costs. The standardized guide rail design allows for direct installation in control cabinets and distribution boxes, making the installation convenient. There is no need to modify the cabinet structure, and the later maintenance is more worry-free.

Which control requirements can the applicable scenarios cover?

With the core advantages of remote automatic control, reliable switching, and compact size, CJX2 AC Contactor is widely applicable to various low-voltage control scenarios. Each scenario can precisely match the requirements and become the standard standard component for low-voltage control. In the motor control scenario, it is suitable for the start and stop control of various low-voltage motors, enabling remote and automatic control to ensure the stable operation of the motors; in the low-voltage control scenario, it is suitable for the on-off control of low-voltage circuits, with reliable switching and convenient operation; in the community control scenario, it is suitable for the control of various devices in the community, without the need for on-site operation, improving management efficiency; in the engineering control scenario, it is suitable for the control of various devices in the engineering site, adaptable to harsh construction environments, ensuring the smooth progress of the project.

Do you support customization to meet individualized needs?

As a professional CJX2 AC Contactor Manufacturer, Supplier and Factory in China, Junray Electrical strictly follows the national standards for AC contactors. Each device undergoes three core tests: power-on debugging, opening and closing tests, and withstand voltage tests to ensure that every factory-produced device can operate stably and smoothly pass the project acceptance, eliminating quality risks. We support customization of current and pole count. Based on your motor control requirements, we can tailor an exclusive AC contactor for you. Whether it's motor start-stop control, low-voltage line control, or control of residential or engineering equipment, it can precisely match and adapt, ensuring no concerns during procurement and greater peace of mind during use.

What is the primary reason?

Compared to similar products from other manufacturers, we have a deeper understanding of the core requirements of low-voltage motor control and can better address the actual concerns of buyers. Choose Junray Electrical:

Professional strength endorsement: With many years of experience in the research and production of low-voltage control equipment, we have a complete system of research, production, and quality inspection. Our products meet both international and domestic standards, ensuring quality;

Clear differentiation advantages: Specifically designed for low-voltage motor control, it can be remotely and automatically controlled, with reliable opening and closing, small size, and completely replacing traditional knife switches, solving core control problems;

Customized services: Supports customization of current and pole number, suitable for different scenarios;

Comprehensive and attentive service: Provide professional selection guidance before sales to help you avoid selection mistakes, and offer installation and commissioning support after sales to ensure a worry-free purchase and use process, facilitating the smooth progress of the project.

Purchase immediately!

Traditional knife switch control is time-consuming and labor-intensive, with high failure rates. Ordinary contactors cannot meet the requirements of remote and automatic control. However, the CJX2 AC Contactor perfectly solves these problems. Remote control saves manpower, automatic control improves efficiency, and reliable opening and closing reduce failures. It is the optimal choice for low-voltage motor control. This product is directly supplied by Junray Electrical, without any middleman price differences. The quality is guaranteed and the price is more favorable. It is the standard standard component for low-voltage control. Contact us now to completely solve the problems of motor control, save manpower and maintenance costs, and improve control efficiency!

Retrofit Case Study

I. Project Overview

This project involves the power distribution system upgrade for a metal processing workshop. The workshop operates numerous loads requiring frequent start-stop cycles, such as cooling water pumps, cooling fans, dust removal equipment, and small air compressors. The original standard, budget-grade AC contactors—subjected to high-frequency switching and surge loads—suffered from failures including contact ablation, contact welding (sticking), coil burnout, and loss of equipment control. Issues such as equipment failing to stop despite the stop button being pressed and accidental automatic restarts frequently occurred, leading to equipment damage and scrapped workpieces. These problems posed safety risks—including mechanical injury and electrical short circuits—and severely disrupted continuous production.

To resolve the issues of frequent contactor burnout, contact welding, and control failure, all power circuits involving frequent start-stop operations were upgraded to high-reliability, industrial-grade AC contactors. Thermal overload protection was also integrated into the control circuits to ensure the safe, stable, and controllable operation of the workshop's power equipment.

II. Issues Prior to Retrofit

Contact ablation/welding and loss of control: The original standard contactors had insufficient capacity margins and weak arc-extinguishing capabilities. High-energy arcs generated during motor start-stop cycles caused the moving and stationary contacts to weld together over time, resulting in failure to stop and equipment operating in a compromised state.

Coil burnout and frequent failures: Due to grid voltage fluctuations and frequent switching, coils suffered from chronic overheating, leading to demagnetization, burnout, and chattering or abnormal noise caused by insecure engagement.

Poor arc-extinguishing capability and short-circuit risk: Arcs generated during switching could not be extinguished quickly, causing inter-phase arcing and tracking, which triggered short-circuit trips.

Poor auxiliary contact performance: Oxidized or loose auxiliary contacts caused failures in start-stop feedback and errors in automatic control logic, leading to malfunctions in automated equipment.

Undersized selection with no margin: Original equipment was selected based strictly on rated current without accounting for motor starting surges; long-term full-load operation accelerated aging and failure. III. Equipment Configuration Plan

To accommodate the inductive loads (such as workshop fans and water pumps) and frequent start-stop operating conditions, this upgrade utilizes industrial-grade AC contactors (CJX2/LC1D series). All circuits are sized at 1.25–1.5 times the rated load current and feature robust arc-extinguishing systems and reliable coils; they are paired with thermal relays to provide integrated overload protection.

Core Equipment Specifications

Model: CJX2-18/25/32 Series Industrial AC Contactors

Rated Voltage: AC 220V/380V (universal control coil)

Compatible Loads: Three-phase fans, water pumps, air compressors, and general power equipment

Structural Features: Silver alloy main contacts, powerful arc-extinguishing chambers, low-power coils, and vibration-resistant structure

Operating Principle: Coil energization engages the main circuit; de-energization allows the spring to reset and disconnect the main circuit, enabling remote/automatic start-stop control.

Capacity Sizing: Selected one size above the standard rating to provide headroom for starting inrush currents and suit frequent start-stop operations.

Integrated Protection: Paired with thermal overload relays for instantaneous tripping and equipment shutdown upon fault detection.

Control Modes: Local push-button control, remote automatic control, and interlocked start-stop.

IV. Application Highlights

Silver Alloy Contacts (Arc-Resistant & Anti-Welding): High-quality silver contacts offer excellent conductivity, high-temperature resistance, and tolerance to high-current surges, effectively preventing arc erosion and contact welding issues.

Powerful Arc-Extinguishing System (Short-Circuit Prevention): Specialized arc-extinguishing grids rapidly quench switching arcs, preventing phase-to-phase arcing and short circuits, thereby enhancing circuit safety.

Oversized Selection (Suited for Frequent Start-Stop): Higher current ratings prevent aging caused by prolonged full-load operation and withstand motor starting inrush currents, significantly extending service life.

Stable Coil Performance (Voltage Fluctuation Resistance): Optimized coil design ensures stability against minor grid fluctuations—preventing chatter, overheating, or loss of magnetic holding—and ensures smooth, noise-free engagement.

Automation Compatibility (Reliable Logic): Precise main and auxiliary contact operation and stable feedback signals ensure seamless integration with PLC automation and interlocked start-stop logic. V. Operational Results After Retrofitting

Elimination of contact-sticking failures: Start/stop operations are crisp and clean with complete disconnection; there is no contact welding or operation with underlying defects, ensuring 100% equipment controllability.

Significant reduction in failure rate: No instances of contactor burnout, abnormal noise, chatter, or malfunction occurred throughout the year, ensuring stable equipment operation.

Prevention of arc-induced short circuits: Excellent arc-extinguishing performance ensures no arcing or sparking during start/stop cycles, leaving the interior of the power distribution cabinet clean and free of scorch marks.

Precise automation control logic: Start/stop feedback is normal and signals are stable; the coordination of automated workshop equipment is reliable, ensuring a stable production flow.

Significant reduction in O&M costs: Eliminates the need for frequent contactor replacement or repeated downtime for maintenance, effectively boosting production efficiency.

VI. Case Summary

AC contactors are core control components in low-voltage power distribution, power control, and automation systems, primarily used for the frequent switching of motor loads to enable remote and automatic control. Standard, budget-friendly contactors often suffer from weak arc-extinguishing capabilities, inferior contact quality, and poor durability against frequent switching, which can easily lead to equipment loss of control or short-circuit faults. Replacing these with high-quality, industrial-grade contactors—selected with appropriate capacity ratings—completely resolves the risk of power circuit control failure; this represents the most fundamental and critical upgrade project for industrial electrical maintenance, rectification, and modernization.