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.

1. Core Technical Parameters
2. 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.

1. Typical Application Scenarios
2. 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.

1. Selection and Usage Recommendations
2. 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.

1. 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.