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:

1. Core Parameters and FunctionsChint NXC-75/220V AC contactor
2. Specification FeaturesChint 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.

1. 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.

1. 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.

1. 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.

1. 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)

1. Core Electrical Parameters
2. Rated Voltage: AC 400V (three-phase system), suitable for 380V/400V power distribution scenarios; not for single-phase 230V circuits.
3. Rated Current: 63A, matching continuous operation of high-power equipment (e.g., motors, transformers).
4. Trip Characteristic: Type D curve, instantaneous trip current 10–16× rated current, effectively handling motor starting inrush currents.
5. Breaking Capacity: 6kA (compliant with IEC 60898-1), safely interrupting short-circuit fault currents.
6. Mechanical and Environmental Parameters
7. Poles: 3P (three-phase), suitable for three-phase four-wire power distribution systems.
8. Mechanical Life: 20,000 operations; Electrical Life: 10,000 operations, ensuring long-term stable operation.
9. Operating Temperature: -35°C to +70°C, adapting to industrial temperature fluctuations.
10. 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).
3. Accessories and Extended Functions
4. Auxiliary Contacts: Supports accessories like AX-X1 (1NO+1NC), MX+OF (shunt trip + auxiliary contact) for remote control and status feedback.
5. 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.
6. 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).

1. Notes
2. Voltage Matching: Only for 400V three-phase systems; not for single-phase 230V circuits.
3. Overload Protection: Frequent tripping indicates checking whether the load exceeds the rated current or a short circuit exists.
4. 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.