Chint NXB63-3P-D63 circuit breaker

 The Chint NXB63-3P-D63 circuit breaker is a three-phase miniature circuit breaker (MCB) designed for high-load scenarios. It is suitable for circuits with an alternating current of 50/60Hz and a rated voltage of 400V AC, providing overload, short-circuit protection, and isolation functions. Below is an analysis of its core information:

*I. Core Parameters and Functions*Chint NXC-75/220V AC contactor*  

 1. **Specification Features*Chint DC Contactor NC1-5011-36V* 

   - **Poles**: 3P (three-phase), suitable for three-phase four-wire power distribution systems.  

   - **Rated Current**: 63A, matching the continuous operation requirements of high-power equipment (e.g., motors, transformers).  

   - **Trip Characteristic**: Type D curve, with an instantaneous trip current of 10–16 times the rated current, effectively handling inrush currents during motor starting.  

   - **Breaking Capacity**: 6kA, safely interrupting short-circuit fault currents to prevent contact welding or equipment damage.  

 2. **Technical Standards**  

   - Complies with IEC 60898-1 (international) and GB/T 10963.1 (China) standards, and is 3C certified.  

   - Operating temperature range: -35°C to 70°C, adapting to temperature fluctuations in industrial environments.  

*II. Application Scenarios**  

- **Industrial Sector**: Motor control, power distribution for production line equipment. The Type D trip characteristic avoids frequent false tripping.  

- **Commercial and Residential Use**: Main switches or branch protection in three-phase power supply systems, such as power distribution in shopping malls and factories.  

- **Special Scenarios**: Equipment requiring high short-circuit protection (e.g., welding machines, transformers), enabling rapid response to fault currents.  

*III. Installation and Usage Recommendations**  

 1. **Installation Requirements**  

   - Must be installed by a professional electrician, vertically mounted on a standard 35mm rail, ensuring wiring screws are tightened to prevent loosening and heat generation.  

   - Use wires with appropriate cross-sectional area (e.g., 6mm² copper wire) and reserve sufficient operating space during wiring.  

 2. **Maintenance and Precautions**  

   - Regularly inspect contacts and terminal blocks to avoid poor contact due to oxidation or looseness.  

   - If tripping occurs frequently, check whether the load exceeds the rated current or if a short-circuit fault exists.  

*IV. Price and Market Positioning**  

- **Reference Price**: More cost-effective than similar imported brands (e.g., Siemens EA9 series).  

- **Positioning**: As an upgraded version of the DZ47 series, the NXB-63 improves breaking capacity and reliability, suitable for cost-sensitive scenarios requiring high protection performance.  

*V. Comparison with Siemens Equivalent Products**  

- **Breaking Capacity**: The Siemens EA9AN3C63 has a breaking capacity of 6kA, comparable to the NXB-63, but its price is typically 30–50% higher.  

- **Trip Characteristics**: Siemens Type D curve products (e.g., 5SJ6 series) have an instantaneous trip multiple of 10–14 times, close to the NXB-63’s 10–16 times, both suitable for motor protection.  

- **Certifications**: Siemens products are usually UL-certified, while the NXB-63 does not explicitly mention North American certifications. U.S. users are advised to prioritize models with UL marks.  

VI. Precautions**  

- **Voltage Matching**: The 3P model has a rated voltage of 400V AC and cannot be used in single-phase 230V circuits.  

- **Certification Compliance**: For use in the U.S., verify whether the product is UL-certified or choose other models compliant with North American standards (e.g., Siemens 5SJ6 series).  

*Technical Parameters of Chint NXB63-3P-D63 Circuit Breaker**  

(Compiled from official data and industry standards)  

**I. Core Electrical Parameters**  

1. **Rated Voltage**: AC 400V (three-phase system), suitable for 380V/400V power distribution scenarios; not for single-phase 230V circuits.  

2. **Rated Current**: 63A, matching continuous operation of high-power equipment (e.g., motors, transformers).  

3. **Trip Characteristic**: Type D curve, instantaneous trip current 10–16× rated current, effectively handling motor starting inrush currents.  

4. **Breaking Capacity**: 6kA (compliant with IEC 60898-1), safely interrupting short-circuit fault currents.  

*II. Mechanical and Environmental Parameters**  

1. **Poles**: 3P (three-phase), suitable for three-phase four-wire power distribution systems.  

2. **Mechanical Life**: 20,000 operations; Electrical Life: 10,000 operations, ensuring long-term stable operation.  

3. **Operating Temperature**: -35°C to +70°C, adapting to industrial temperature fluctuations.  

4. **Installation Method**: Standard 35mm rail mounting, requiring vertical fixation for heat dissipation and operational stability.  

*III. Certifications and Compliance**  

1. **Domestic Certification**: 3C certified (Certificate No. 2020980307001645), compliant with GB/T 10963.1.  

2. **International Standards**: Compliant with IEC 60898-1, but not explicitly UL-certified. North American users should prioritize models with UL marks (e.g., Siemens 5SJ6 series).  

*IV. Accessories and Extended Functions**  

1. **Auxiliary Contacts**: Supports accessories like AX-X1 (1NO+1NC), MX+OF (shunt trip + auxiliary contact) for remote control and status feedback.  

2. **Wiring Terminals**: Threaded pressure plate terminals recommended for 6mm² copper wire (for 63A load), with a tightening torque of 2.0N·m to avoid heat generation.  

*V. Dimensions and Installation Size**  

- **Dimensions**: Approximately 90mm (W) × 75mm (H) × 85mm (D), subject to the official manual.  

- **Wiring Space**: Reserve sufficient space; recommended wire cross-sectional area: 1–25mm² (selected by load current).  

**VI. Notes**  

1. **Voltage Matching**: Only for 400V three-phase systems; not for single-phase 230V circuits.  

2. **Overload Protection**: Frequent tripping indicates checking whether the load exceeds the rated current or a short circuit exists.  

3. **North American Market**: Not UL-certified; recommend Siemens 5SJ6 or other North American-compliant models.  

For complete technical manuals or customized parameters, visit Chint Electric’s official website or contact a supplier. For North American applications, ensure product compliance to avoid safety risks.