NXM125S-125A molded case circuit breaker of CHINT

 which complies with the CE standard. The **NXM125S-125A molded case circuit breaker** of CHINT Electric is a low-voltage power distribution protection device that meets the **CE standard**, applicable to industrial, commercial and residential fields, providing overload, short-circuit and undervoltage protection. The following is a detailed analysis from aspects such as technical parameters, certification compliance, application scenarios and selection suggestions:

 I. Core Technical Parameters

1. **Basic Specifications**

   - **Frame Rating**: 125S (supporting a maximum rated current of 125A).

   - **Number of Poles**: 3P (three-phase) or 4P (three-phase + neutral wire), supporting different power distribution requirements.

   - **Rated Voltage**: AC 400V (some models support up to 690V, please refer to the specific specifications).

   - **Breaking Capacity**:

     - **Standard Type (S Grade)**: 25kA (suitable for general power distribution scenarios).

     - **High Breaking Capacity Type (H Grade)**: 50kA or 70kA (it is necessary to confirm the specific model suffix, such as NXM125H-125A).

   - **Tripping Characteristics**: Thermal-magnetic tripping, supporting overload long-time delay (Ir) and short-circuit instantaneous (Im) protection. Some models support adjustable magnetic tripping current.

   - **Installation Method**: Fixed type, front-of-panel wiring, supporting vertical or horizontal installation.

2. **Extended Functions**

   - **Accessory Compatibility**: Optional auxiliary contacts, shunt trip devices, undervoltage trip devices, etc., to meet the needs of remote control or signal feedback.

   - **Leakage Protection**: If leakage protection is required, the NXMLE-125S series can be selected, with a leakage operating current of 30-100mA.

II. CE Certification Compliance

1. **Certification Scope*YouTube：https://youtube.com/shorts/z9oFyJK0atU  *

   - **Directive Coverage**:

     - **Low Voltage Directive (LVD 2014/35/EU)**: Ensuring electrical safety (such as protection against electric shock and overheating).

     - **Electromagnetic Compatibility Directive (EMC 2014/30/EU)**: Complying with EN 61000-6-2 (anti-interference in industrial environments) and EN 61000-6-4 (emission limits).

     - **RoHS Directive (2011/65/EU)**: Limiting the use of hazardous substances and meeting environmental protection requirements.

   - **Standard Basis**:

     - **EN 60947-2**: The standard for low-voltage switchgear and controlgear, defining the performance requirements of the circuit breaker.

     - **EN 60947-4-1**: Additional requirements for motor control circuits (if used for motor protection).

2. **Market Access**

   - **European Union Market**: After passing the CE certification, it can be freely sold in the European Union and the European Economic Area (EEA) without the need for additional national certifications.

   - **Other Certifications**: Some models may also comply with standards such as KC (South Korea), EAC (Eurasian Economic Union), etc.

 III. Typical Application Scenarios

1. **Power Distribution System Protection**

   - **Main Incoming Switch**: Used in a 380V/400V three-phase power distribution system to protect downstream branch circuits.

   - **Motor Control**: Supporting the infrequent starting of motors and providing overload and short-circuit protection (needs to be used in conjunction with contactors).

   - **Photovoltaic or Energy Storage Systems**: As the protection on the DC side (it is necessary to confirm the DC specifications).

2. **Environmental Adaptability**

   - **Temperature Range**: -5°C to +40°C (some models support -35°C to +70°C, please refer to the product manual).

   - **Altitude Limit**: ≤2000 meters, and capacity derating is required for high-altitude areas.

   - **Protection Level**: IP30 (preventing the intrusion of solid foreign objects), and a distribution box is required to achieve higher protection.

 IV. Selection and Usage Suggestions

1. **Matching of Key Parameters**

   - **Rated Current**: The 125A should match the load current, and it is recommended to leave a 20% margin (for example, the load current ≤ 100A).

   - **Breaking Capacity**: Select according to the **expected short-circuit current** at the installation site. For example:

     - Industrial power distribution: Usually, a breaking capacity of more than 50kA is required.

     - Residential or small commercial: 25kA can meet the demand.

   - **Tripping Characteristics**:

     - **Type B**: The magnetic tripping current is 3-5 times In, suitable for non-inductive loads (such as lighting).

     - **Type C**: 5-10 times In, suitable for conventional loads (such as motors).

     - **Type D**: 10-20 times In, suitable for high-impact loads (such as transformers).

2. **Installation and Maintenance**

   - **Wiring Requirements**: Use copper busbars or cables, and the tightening torque should comply with the specifications (for example, the torque of an M6 bolt is 8-10N·m).

   - **Regular Inspections**:

     - Clean the contacts and check the status of the arc extinguish chamber every 1-2 years.

     - Tripping test: Use special testing equipment to verify the overload and short-circuit protection functions.

3. **Alternative Solutions and Competitor Comparisons**

   - **Schneider ComPacT NSX**:

     - **Advantages**: Digital functions (such as wireless monitoring, electrical energy metering), modular design.

     - **Disadvantages**: Higher price, suitable for scenarios with high requirements for intelligence.

   - **ABB Tmax XT**:

     - **Advantages**: Higher breaking capacity (up to 150kA), compact size.

     - **Disadvantages**: The cost is significantly higher than CHINT products.

 V. Procurement and After-sales Service

1. **Price Reference**

   - **International Market**: Purchased through authorized dealers, and the price may increase by 20-40% (for example, about 134 US dollars in the US market). Contact hebei china electric to get a more favorable quotation. Whatsapp: 86-13811255435.

2. **Supply Channels**

   - **Domestic**: Contact Hebei China Electric Technology Co., Ltd.

   - **International**: Through CHINT's overseas branches (such as European subsidiaries) or authorized distributors (hebei china electric).

3. **Warranty and Service**

   - **Warranty Period**: Usually 1-2 years, subject to the specific purchase contract.

   - **Technical Support**: CHINT provides product manuals, selection software and on-site technical guidance.

 VI. Precautions

1. **Certification Compliance**

   - Ensure that the product nameplate clearly indicates the "CE" mark and the certification body code (such as TÜV, SGS).

   - When exporting to the European Union, it is necessary to provide the **EU Declaration of Conformity (DoC)** and technical documents (such as test reports, circuit diagrams).

2. **Environmental Impact**

   - After being scrapped, it needs to be recycled in accordance with the WEEE Directive to avoid pollution by hazardous substances.

Conclusion

With its **high cost-effectiveness** and **CE certification compliance**, the CHINT NXM125S-125A molded case circuit breaker has become a reliable choice for low-voltage power distribution in the European Union market. Its core advantage lies in the stability of basic protection functions, making it suitable for scenarios that are cost-sensitive and require compliance with European standards. If higher breaking capacity or intelligent functions are required, you can consider upgrading to the H-grade models of the NXM series or competitor brands. It is recommended to obtain the latest technical manual through the CHINT official website or authorized dealers before selection to ensure that the parameters fully match the application requirements.