Chint AC Motor Starter NS2-25/2.5-4A

Chint AC Motor Starter NS2-25/2.5-4A is an electrical device integrating protection and control functions, suitable for starting and protecting three-phase squirrel-cage asynchronous motors.

I. Core Technical Parameters and Functions

1. **Application Scope*CHINT NS2-32H 17-23A AC motor starter*  

   - **Voltage and Current**: It supports AC voltage up to 690V, with a current adjustment range of 2.5-4A, and can be adapted to motors with a power of approximately 1.1-2.2kW (the specific power depends on the voltage level, e.g., about 2.2kW at 400V).  

   - **Protection Functions**: Built-in overload, phase failure, and short-circuit protection, complying with IEC 60947-2/4-1 and GB/T 14048.2/4 standards, and can replace the traditional combination of fuses, circuit breakers, and thermal relays.  

   - **Structural Design**: Adopts a direct-acting double-contact structure, integrating an instantaneous electromagnetic release (setting value 51A) and a bimetallic strip thermal element, and supports a trip test function (verifying the tripping reliability through the "Test" button).

2. **Electrical Characteristics*Schneider LRD08C thermal relay*  

   - **Insulation and Breaking Capacity**: The rated insulation voltage is 690V, and the rated ultimate short-circuit breaking capacity (Icu) is 50kA at 400V, which can meet the short-circuit protection requirements of most industrial environments.  

   - **Environmental Adaptability**: The operating temperature range is -5℃ to +40℃, with an IP20 protection rating (against solid foreign object intrusion), suitable for indoor control cabinet installation.

II. Key Points for Installation and Use

1. **Installation Conditions**  

   - **Environmental Requirements**: The altitude should not exceed 2000 meters, the inclination of the installation surface from the vertical plane should not be more than ±5°, and it should be avoided to use in humid, dusty, or corrosive environments.  

   - **Wiring Specifications**: For the main circuit, it is recommended to use copper wires with a cross-sectional area of 1.5-2.5mm², and for the control circuit, 0.75-1.5mm² wires can be selected to ensure reliable contact to prevent overheating.

2. **Operation and Debugging**  

   - **Current Setting**: Adjust the setting current to the motor rated value through the knob; if an intermediate value is needed, it can be fine-tuned and verified through actual operation.  

   - **Locking Function**: The closing button has a built-in indicator, which can be locked with a padlock after being pulled out to prevent unauthorized operation.  

   - **Troubleshooting**: After tripping, check the motor load or line. Before resetting, wait for the bimetallic strip to cool down (about 5 minutes) to avoid misoperation caused by frequent operations.

 III. Adaptability to the North American Market and Purchase Suggestions

1. **Certification and Compliance**  

   - Chint products have passed international certifications such as UL and CE as a whole, but the specific UL certification status of NS2-25/2.5-4A is not clearly mentioned in the search results. It is recommended to confirm whether it meets North American electrical standards through Chint North America official website (www.chintamericas.com) or customer service (Whatsapp: 0086-13811255435).

2. **Purchase Channels**  

   - **Authorized Distributors**: Chint covers the North American market through partners such as Whatsapp: 0086-13811255435, and local distributors can be queried through its official website.  

3. **Alternative Solutions**  

   - If the NS2-25/2.5-4A is out of stock, other models in the NS2-25 series can be considered (such as NS2-25/1.6-2.5A with a setting range of 1.6-2.5A), or the ABB MS116 series (such as MS116-4.0, compatible with 4-6.3A range).

 IV. Typical Application Scenarios

1. **Industrial Field**  

   - Direct start control of small and medium-sized water pumps, fans, conveyors, etc., especially suitable for scenarios that require frequent starting and stopping but have low speed regulation requirements.  

   - Cooperate with PLC or relays to realize remote control, for example, feed back the operating status to the control system through auxiliary contacts.

2. **Power Distribution System**  

   - Can be used as a short-circuit protection device for distribution lines, replacing some molded case circuit breakers to simplify the cabinet layout.  

   - Note: When the expected short-circuit current exceeds 50kA, an external backup fuse (such as RT16-00 series) is required.

V. Maintenance and Precautions

1. **Daily Maintenance**  

   - Regularly clean the dust on the shell, check whether the wiring terminals are loose, and ensure good heat dissipation.  

   - Conduct a trip test at least once a year to verify the effectiveness of the protection function.

2. **Safety Tips**  

   - The power must be cut off before installation or maintenance to avoid the risk of electric shock.  

   - Non-professionals are not allowed to disassemble internal components to avoid damaging the protection characteristics.

VI. Reference Materials

- **User Manual**: The "NS2-25 AC Motor Starter Instruction Manual" can be downloaded through the Chint official website to obtain detailed wiring diagrams and parameter tables.  

- **Technical Support**: North American customers can contact Chint Power Systems America (Whatsapp: 0086-13811255435) for localized technical services.

For further confirmation of model compliance or purchase details, it is recommended to contact the Chint North America team directly to ensure that the solution meets local standards and application requirements.