Chint CJ20-630A/380V AC contactor

The Chint CJ20-630A/380V AC contactor is an industrial control device specifically designed for high-power circuits. It is suitable for circuits with AC 50Hz, rated voltage of 380V, and rated current of 630A. It is mainly used for remotely connecting and disconnecting circuits, and can cooperate with thermal overload relays to realize motor protection.

 I. Core Technical Parameters and Structural Design

1. **Electrical Performance*Chint AC contactor *  

   - **Rated Current**: 630A (under AC-3 service category, it can control a three-phase squirrel-cage motor with a maximum power of approximately 315kW).  

   - **Electrical Life**: 1 million times (under AC-3 duty system), and the mechanical life reaches 6 million times, reflecting high reliability.  

   - **Coil Voltage**: Supports AC 380V, 220V, 127V, etc., and DC 220V is optional, adapting to various control circuit requirements.  

2. **Structural Features*Chint AC contactor coil NXC-25-220V*  

   - **Arc Extinguishing System**: Adopts a plastic grid arc extinguishing cover, which can quickly extinguish the arc generated when breaking large currents, ensuring the service life of contacts and breaking reliability.  

   - **Contact Material**: Silver-based alloy contacts with excellent anti-welding performance, which can maintain stable conductive performance after long-term use.  

   - **Installation Method**: Supports screw fixing or 35mm standard rail mounting (for some models), with an inclination not exceeding ±5°, adapting to various industrial environments.  

3. **Auxiliary Functions*CHINT circuit breaker price*  

   - **Auxiliary Contacts**: Specifications of 250A and above are equipped with 4 normally open and 2 normally closed auxiliary contacts as standard, which can expand control logic (such as interlocking, signal feedback).  

   - **Energy-saving Module**: Models CJ20-63 and above can be optionally equipped with AC silent energy-saving (J) or AC/DC universal energy-saving (JZ) modules to reduce energy consumption and noise.  

 II. Application Scenarios and Installation Requirements

1. **Typical Applications**  

   - **Industrial Drive**: Motor control in large factories (such as water pumps, fans, compressors), supporting frequent start-stop and forward-reverse operations.  

   - **Power Distribution System**: Cooperates with circuit breakers and fuses to build highly reliable power distribution nodes.  

   - **Special Environments**: Adapts to an ambient temperature of -5℃~+40℃, altitude ≤2000m, and relative humidity ≤90% (no condensation), meeting the needs of most industrial scenarios.  

2. **Installation Specifications**  

   - **Wiring Requirements**: The main contacts should use copper cables with a cross-sectional area of ≥185mm² or 50×5mm copper bars, and the tightening torque should reach 14N·m to ensure low-resistance connection.  

   - **Environmental Protection**: Avoid installation in environments with strong vibration, flammable gases or corrosive media, and it is recommended to reserve sufficient heat dissipation space.  

 III. Troubleshooting and Maintenance Suggestions

1. **Common Problems and Solutions**  

   - **Contactor Not Pulling In**: Check if the coil voltage is normal (needs to reach 85%~110% of the rated value), clean the oil stains on the iron core pole surface, and eliminate mechanical jamming.  

   - **Contact Welding**: If the load side is short-circuited or the operation frequency is too high, resulting in contact adhesion, the contacts need to be replaced and the circuit protection device should be checked.  

   - **Coil Overheating**: Avoid voltage fluctuations exceeding ±10%, ensure the ambient temperature does not exceed +40℃, and replace the suitable coil if necessary.  

2. **Maintenance Cycle**  

   - **Daily Inspection**: Clean the dust on the shell monthly, and check the contact wear (replace when the silver layer thickness is <0.5mm).  

   - **Annual Maintenance**: Test the contact resistance (should be ≤50μΩ), verify the integrity of the arc extinguishing cover, and tighten all terminals.  

 IV. Certification and Compliance

This model has passed China Compulsory Certification (CCC certification), with the certificate number 2002010304009742, valid until November 8, 2020. It is recommended to confirm whether the current product still meets the latest industry standards (such as GB/T 14048.4-2010) through Chint's official website or authorized dealers.  

V. Purchase and Alternative Solutions

1. **Price Reference**  

   - The price of official channels (such as Chint Electric Mall) is about 5257 yuan per unit, and the quotation from third-party platforms (Whatsapp: 0086-13811255435) is about yuan per unit. Attention should be paid to configuration differences (such as the number of auxiliary contacts, whether it contains an energy-saving module).  

2. **Alternative Models**  

   - **NC2 Series**: Chint's new generation contactor (such as NC2-630) adopts a modular design, supports more flexible expansion of auxiliary functions, and the mechanical life is increased to 10 million times, which can be used as an upgrade option.  

VI. Safety Warnings

1. **Operation Specifications**  

   - Power must be cut off during installation and maintenance, and it should be operated by professional electricians to avoid the risk of electric shock.  

   - It is prohibited to use in flammable and explosive environments to prevent explosions caused by arcs.  

2. **Environmental Requirements**  

   - Waste products must be disposed of according to electronic waste standards to avoid environmental pollution.  

The core technical parameters of the Chint CJ20-630A/380V AC contactor are sorted out below, combining official data and industry standards:

 I. Electrical Performance Parameters

 II. Structure and Material Parameters

 III. Environmental Adaptability Parameters

 IV. Shape and Physical Parameters

 V. Key Performance Indicators

1. **Action Characteristics**  

   - Pull-in voltage: 85%~110% of rated voltage<br>

   - Release voltage: 20%~75% of rated voltage (for ordinary type) or 10%~75% (for energy-saving type).

2. **Insulation Performance**  

   - Power frequency withstand voltage: 3000V/1min between main contacts, 2500V/1min between main contacts and coil.

VI. Typical Application Parameters

 VII. Usage Notes

1. **Wiring Specifications**  

   - The main circuit terminals must be tightened with a torque wrench according to 14N·m to avoid heating caused by virtual connection.

2. **Maintenance Cycle**  

   - Check the contact wear every quarter (replace when the silver layer thickness is <0.5mm), and verify the integrity of the arc extinguishing cover every year.

3. **Alternative Solutions**  

   - Upgrade model: Chint NC2-630 contactor, with mechanical life increased to 10 million times, supporting modular expansion.