The meaning of the last four digits of the CHINT AC contactor CJX2

In the model numbers of the CHINT AC contactor CJX2 series, **the meaning of the four-digit suffix is mainly related to the rated current and the configuration of auxiliary contacts**, and the specific rules are as follows:

 I. Decomposition and Meanings of the Four-digit Number

Take the common models **CJX2-1210** and **CJX2-0901** as examples:

1. **The first two digits (such as 12, 09)**

   - **They represent the rated current of the contactor**, with the unit being amperes (A).

   - For example:

     - **12** indicates that the rated current is **12A** (suitable for small and medium-sized loads, such as lighting and small motors);

     - **09** indicates that the rated current is **9A** (suitable for low-load scenarios).

   - **Special instructions**:

     - For some models, there may be **"rounding" or approximate values**. For example, the rated current of CJX2-1810 is 18A, but it may be marked as 17.5A in the actual product manual (it is necessary to refer to the official parameters).

     - If the model contains a letter (such as **CJX2-1210N**), **"N" usually indicates a reversible contactor**, but the meaning of the four-digit number remains unchanged.

2. **The last two digits (such as 10, 01)**

   - **They represent the quantity and type of auxiliary contacts**, in the format of **"number of normally open contacts + number of normally closed contacts"**.

   - For example:

     - **10** indicates **1 normally open contact (NO)** and **0 normally closed contacts (NC)**;

     - **01** indicates **0 normally open contacts** and **1 normally closed contact**;

     - **22** indicates **2 normally open contacts** and **2 normally closed contacts** (for example, in CJX2-4011, the last two digits "11" indicate 1NO + 1NC).

   - **Special instructions**:

     - For some models, the functions may be further distinguished by **"letter suffixes"**. For example, "04" in **CJX2-1204N** indicates **0 normally open contacts** and **4 normally closed contacts**, but this type of model is relatively rare, and it is necessary to confirm in combination with the specific product parameters.

II. Examples of Typical Models and Parameter Correspondences

III. Association between Other Key Parameters and Models

1. **Number of Poles (Pole)**

   - **It is usually not directly reflected in the four-digit number**, and it is necessary to confirm through the model suffix or product description.

   - For example:

     - **CJX2-1210N 220V** indicates a **3-pole (3P)** reversible contactor, suitable for three-phase motor control;

     - **CJX2-6504N** indicates a **4-pole (4P)** contactor, used in special power distribution scenarios.

2. **Coil Voltage**

   - **The voltage information may be included in the model**, but it is necessary to judge in combination with the complete model.

   - For example:

     - **CJX2-1210 24V** indicates that the coil voltage is **24V AC**;

     - **CJX2-1801 380V** indicates that the coil voltage is **380V AC**.

3. **Certifications and Standards**

   - **CE certification**: Complies with the EN 60947-4-1 standard (low-voltage switchgear and controlgear);

   - **CCC certification**: Models sold in China need to pass the China Compulsory Certification.

IV. Selection and Usage Suggestions

1. **Select the Rated Current According to the Load Current**

   - **Principle**: The rated current of the contactor ≥ 1.2 times the load current (considering the motor starting impact).

   - **Example**: When controlling a 10A motor, **CJX2-1210** (12A) should be selected instead of **CJX2-0910** (9A).

2. **Select the Auxiliary Contacts According to the Control Logic**

   - **Normally open contacts (NO)**: Used for signal output (such as start indication);

   - **Normally closed contacts (NC)**: Used for safety interlocking (such as emergency stop circuits).

3. **Pay Attention to Environmental and Installation Requirements**

   - **Protection level**: Usually IP20 (protection against finger contact), and models with an IP55 or above protection level need to be selected for special scenarios;

   - **Installation method**: Supports rail installation (35mm standard), which is convenient for quick replacement.

V. Official Documents and Verification

For further confirmation, you can refer to the **CHINT official website** or **product manuals**. For example:

- The technical parameters of **CJX2-1210** clearly state **"rated current 12A, auxiliary contact 1NO"**;

- The manual of **CJX2-0901** states **"9A, 1NC auxiliary contact"**.

Through the above rules, users can quickly identify the core parameters of the CJX2 contactor to ensure accurate model selection.