Chint CJX2-0901 AC contactor

Chint CJX2-0901 is a compact AC contactor, mainly used to control the on-off of motors or other loads in industrial and commercial circuits.

 I. Core Technical Parameters

1. Model Meaning

- **CJX2**: Series code (CJ stands for AC Contactor, and X2 is the design serial number).

- **09**: Rated operating current of 9A (under AC-3 service category, it can control a 4kW motor at 380V).

- **01**: Auxiliary contact configuration is 1 normally closed (NC) contact, with no normally open (NO) contacts.

2. Electrical Characteristics

- **Coil Voltage**: Supports multiple AC voltages such as 24V, 36V, 48V, 110V, 220V, 240V, and 380V. Selection should be based on actual needs (e.g., CJX2-0901-220V indicates a coil voltage of 220V).

- **Main Contacts**: 3-pole normally open (3NO), with a rated insulation voltage of 660V and a conventional heating current of 25A.

- **Auxiliary Contacts**: 1 normally closed (NC) contact, with a rated current of 10A, which can be used for interlocking of control circuits or signal feedback.

- **Service Life**: Mechanical service life of 10 million times, electrical service life of 1 million times under AC-3, and 200,000 times under AC-4 (suitable for high-load switching scenarios).

 3. Physical Specifications

- **Installation Method**: Supports quick installation on 35mm DIN rails and can also be fixed with screws, saving space and facilitating maintenance.

- **Dimensions**: Approximately 79mm × 44mm × 71mm (length × width × height), with a weight of about 0.32kg.

- **Wiring Capacity**: The main contacts can be connected to 2.5mm² flexible wires or 4mm² rigid wires, and the auxiliary contacts support 1.5mm² wires.

 II. Typical Application Scenarios

 1. Motor Control

- Directly starts three-phase asynchronous motors below 380V/4kW or 220V/2.2kW, suitable for equipment such as fans, water pumps, and compressors.

- Can be combined with thermal overload relays (e.g., NR2, JRS1 series) to form electromagnetic starters, providing overload protection.

2. Industrial Automation

- Implements sequential control of equipment in production lines, for example, controlling the contactor coil through PLC output signals to drive robotic arms or conveyors.

- Used in star-delta reduced-voltage starting circuits, cooperating with time relays to achieve smooth starting.

3. Power Systems

- Serves as a remote control component in power distribution systems, realizing the switching-on and switching-off of circuits by controlling the on-off of the coil, thereby improving power supply reliability.

 III. Performance Advantages and Expansion Functions

1. Reliability Design

- Adopts silver alloy contact material, which has excellent anti-welding and wear-resistant performance, suitable for frequent operation occasions.

- The coil has a built-in surge suppressor (external SR2-A series is required), which can reduce electromagnetic interference and protect the control system.

2. Modular Expansion

- F4 series auxiliary contact blocks can be installed on the top (e.g., F4-20: 2 normally open contacts; F4-02: 2 normally closed contacts), and the number of auxiliary contacts can be expanded to a maximum of 4 pairs.

- Air time delay heads (F5 series) can be installed on the side to achieve 0.1-180 seconds of energization or de-energization delay functions, meeting the needs of complex timing control.

3. Compatibility and Certifications

- Compatible with international brands such as Schneider LC1-D09 and Siemens 3TF40, with matching installation dimensions and electrical parameters, facilitating replacement and upgrading.

- Has passed certifications such as CCC and CE, complies with GB/T 14048.4 and IEC 60947-4-1 standards, and is suitable for most regions around the world.

IV. Selection and Usage Recommendations

1. Key Selection Points

- Select the service category according to the load type: AC-3 is used for normal motor starting, and AC-4 is used for occasions with frequent forward-reverse rotation or braking (derating is required in this case).

- The coil voltage must be consistent with the control circuit to avoid coil burnout or incorrect operation of the contactor due to voltage mismatch.

2. Installation Precautions

- The installation environment temperature should be between -5℃ and +40℃, and high-temperature or humid environments should be avoided to prevent impact on service life.

- The main circuit and control circuit should be wired separately to reduce signal interference; during wiring, ensure that the contacts are crimped firmly to prevent heating caused by poor contact.

3. Maintenance Recommendations

- Regularly clean the oxide layer and dust on the contact surface, check the contact wear condition, and replace the contacts when the wear exceeds 1mm.

- Check the coil insulation resistance every 1-2 years, which should be not less than 1MΩ; if overheating or abnormal noise of the coil is found, troubleshoot in a timely manner.

 V. Market Price and Purchase Channels

Reference Prices

- The 220V coil model is priced at approximately 20-35 RMB per unit (WhatsApp: 0086-13811255435).

- The unit price of expansion modules (e.g., F4 auxiliary contact blocks) is approximately 3-10 RMB, and that of air time delay heads is approximately 50-100 RMB.