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.

– Industrielle Automatisierung: 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: Zum Beispiel, 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: Zum Beispiel, 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. Vorsichtsmaßnahmen

– 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.）