Chint CJ20-100 AC contactor

     Chint CJ20-100 is an AC contactor suitable for the field of industrial control. It is mainly used for remotely connecting and disconnecting circuits, and can be used in conjunction with a thermal overload relay to achieve overload protection for motors. The following are its detailed technical parameters and application instructions:

1. Core Technical Parameters

- Rated Operating Current: 100A, suitable for controlling three-phase motors with a maximum power of 50kW (AC-3, 380V).

- Voltage Range:

  - Rated Insulation Voltage of Main Circuit: 660V, applicable to AC 50Hz/60Hz circuits.

  - Optional Control Coil Voltage: AC 110V, 127V, 220V, 380V (50Hz), which should be selected according to actual control requirements.

- Contact System:

  - Main Contacts: 3 sets of normally open (3NO), adopting a double-break direct-acting structure, equipped with a clay longitudinal slot arc-extinguishing cover, featuring high breaking capacity.

  - Auxiliary Contacts: 2 sets of normally open (2NO) + 2 sets of normally closed (2NC) by default, which can be expanded to 4 sets through an expansion module (e.g., F4 series).

- Service Life Indicators:

  - Mechanical Life: 10 million operations; Electrical Life: 1.2 million operations (AC-3, 380V).

  - Operating Frequency: Up to 600 operations per hour under AC-3 category.

2. Installation and Wiring

- Installation Methods:

  - Screw Fixing: Suitable for fixing on control cabinets or mounting plates. It is necessary to ensure that the inclination angle between the mounting surface and the vertical plane does not exceed ±5°.

  - Rail Mounting: Some documents do not clearly state that rail mounting is supported, but the CJ20-10~25A models support 35mm DIN rail mounting. It is inferred that the CJ20-100 may need to be used with an adapter.

- Wiring Specifications:

  - Main Contact Wiring: It is recommended to use wires with a cross-sectional area not exceeding 50mm², adopting the front-panel wiring method.

  - Coil Wiring: Wires should be selected according to the coil voltage, and attention should be paid to polarity (AC coils have no polarity).

3. Matching and Protection

- Thermal Overload Relay:

  - Recommended Model: JR20-160 (5W range, rated current range: 85~100~115A), which is directly connected to the contactor through a conductive plate to achieve overload and phase-failure protection.

  - Protection Characteristics: When the current exceeds the rated range, the thermal relay acts within a certain period of time to cut off the control circuit.

- Fuse: It is recommended to match with RT16-250 type fuses (breaking capacity: 50kA) for short-circuit protection.

4. Application Scenarios

- Motor Control: Suitable for AC-3 category loads (e.g., frequent starting and stopping of squirrel-cage motors), and can control motors below 50kW.

- Industrial Automation: Widely used in the electrical control systems of equipment such as machine tools, pumps, and fans, supporting remote operation and interlock control.

- Special Environments: Operating temperature range: -5℃~+40℃, altitude not exceeding 2000m, pollution degree Class 3, which can adapt to general industrial environments.

5. Alternative Models and Upgrade Solutions

- Chint NXC Series: For example, NXC-115, which has a smaller size, lower power consumption (coil pull-in power: 550VA → 450VA), supports rail mounting, and its electrical life is increased to 2 million operations.

- Schneider LC1-F Series: For example, LC1-F115, which is compatible with the installation dimensions of CJ20-100, has an electrical life of up to 1.5 million operations, and is suitable for high-end applications.

6. Precautions

- Model Selection Verification: The model should be strictly matched according to the actual load type (AC-3/AC-4), voltage, and current to avoid overload operation.

- Installation and Maintenance:

  - Regularly check the wear condition of the contacts; when the contact thickness is worn by more than 1/3, it should be replaced.

  - Ensure that the arc-extinguishing cover has no cracks or dust accumulation to avoid affecting the breaking performance.

- Price Reference:

  - The market price of a single CJ20-100 (AC220V coil) is approximately 150~200 RMB, and the JR20-160 thermal overload relay is approximately 100 RMB.

7. Standards and Certifications

- It complies with GB/T 14048.4 and IEC 60947-4-1 standards, and has passed the CCC certification, ensuring safety and reliability.  

（Note: GB/T refers to "National Standard of the People's Republic of China"; CCC is the "China Compulsory Certification" mark, a mandatory safety certification system for products sold in the Chinese market.）