Chint Contactor CJX2-5011

   Chint Contactor CJX2-5011 is a three-phase AC contactor specifically designed for industrial control. It is suitable for frequent starting and stopping of motors, power distribution systems, and automated equipment. The following is a summary of its core information:

 I. Technical Parameters and Performance

1. Electrical Specifications

- **Rated Current**: 50A (under AC-3 utilization category and 380V voltage), which can meet the control requirements of motors ranging from 7.5kW to 15kW.

- **Auxiliary Contacts**: 1 Normally Open (NO) + 1 Normally Closed (NC), supporting interlocking or signal feedback circuits.

- **Coil Voltage**: Available in multiple options including 24V, 36V, 110V, 220V, and 380V, compatible with different control power supplies.

- **Pole Number**: 3 poles (3P), suitable for three-phase circuits.

- **Insulation Voltage**: 660V (per IEC standard) or 690V (per GB standard), meeting the requirements of high-voltage environments.

2. Mechanical and Environmental Characteristics

- **Mechanical Life**: Over 6 million operations; electrical life can reach 1.2 million operations (for AC-3), suitable for high-frequency operation scenarios.

- **Mounting Method**: Supports 35mm DIN rail or screw fixing, compatible with industrial standardized installation.

- **Operating Temperature**: -5℃ to +40℃, adaptable to a wide temperature range.

- **Arc Extinguishing System**: Adopts a double-break structure and arc-extinguishing grids, with an arc distance of less than 10mm to ensure safety.

3. Certification and Compliance

- Certified to GB14048.4 (China) and IEC60947-4-1 (international) standards; some models have obtained CE certification.

- Complies with the requirements of pollution degree 3 and installation category Ⅲ for industrial environments.

II. Application Scenarios

1. Motor Control

It can directly control the starting and stopping of 7.5kW to 15kW motors, and supports complex logic such as star-delta reduced-voltage starting and reversible control. Typical applications include fans, water pumps, compressors, and other equipment.

2. Industrial Automation

As an executive component of PLC systems, it is used for sequential control of production line equipment, starting and stopping of conveyors, etc., and is compatible with 24V~415V wide-voltage control signals.

3. Power Distribution and Energy Sector

It controls air conditioning and lighting systems in building electrical systems, and realizes circuit on-off in new energy scenarios (such as solar inverters).

 4. Replacement and Upgrade

It can directly replace Schneider LC1-D50 series contactors, or be upgraded to Chint's new-generation NXC series (e.g., NXC-50). The latter has a mechanical life increased to 55 million operations and better arc-extinguishing performance.

 III. Price and Purchase Channels

 1. Market Price

- **International Market**: Approximately USD 14.46 per unit (under FCA terms). The specific price fluctuates according to the voltage model and purchase quantity.

IV. Installation and Usage Guidelines

1. Wiring Specifications

- **Main Circuit**: Connect L1/L2/L3 to the three-phase power supply, and T1/T2/T3 to the load (e.g., motor). It is recommended to use 16mm² copper core wires.

- **Control Circuit**: Connect the coil terminals A1/A2 to the control voltage. The auxiliary NO contact is used for self-locking, and the NC contact is used for interlocking (see the sample wiring diagram for details).

- **Grounding**: The metal housing must be reliably grounded to avoid electromagnetic interference.

2. Commissioning and Maintenance

- Before installation, check whether the coil voltage matches, and manually operate the contactor to confirm that the contacts move flexibly.

- Monitor the temperature rise of the contacts during operation. If the temperature exceeds 70℃, it is necessary to check for overload or poor contact.

- Regularly clean the arc-extinguishing chamber and replace worn silver contacts (it is recommended to check once every 500,000 operations).

V. Alternative Models and Upgrade Recommendations

 1. NXC Series Contactors

- **Advantages**: Modular design, support for more contact combinations (e.g., 2NO+2NC), arc distance shortened to within 10mm, and adaptation to the digital needs of smart factories.

- **Compatibility**: NXC-50 can directly replace CJX2-5011 without changing the installation holes or circuit layout.

2. Alternatives from Other Brands

- Schneider LC1-D50: Fully compatible in parameters but relatively higher in price.

- Delixi CDX2-5011: Close in cost-effectiveness; some models provide UL certification.

VI. User Reviews and Precautions

1. User Feedback

- Most users recognize its durability, with no faults during continuous operation under resistive loads for 2 years.

- Some users mentioned that the 220V coil may malfunction during voltage fluctuations, and it is recommended to use it with a voltage stabilizer.

2. Selection Precautions

- Confirm the load type: Different contact capacities are required for AC-3 (motors) and AC-4 (high-inductance loads).

- Environmental Adaptability: It is recommended to install a dust cover in dusty environments; prioritize the NXC series in high-temperature environments.