Chint NXB63-3P-D63 circuit breaker

The Chint NXB63-3P-D63 întrerupător de circuit 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, protectie la scurtcircuit, and isolation functions. Below is an analysis of its core information:

1. Core Parameters and FunctionsChint NXC-75/220V AC contactor
2. Specification FeaturesContactor DC Chint NC1-5011-36V

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

Curent nominal: 63O, matching the continuous operation requirements of high-power equipment (de ex., motoare, transformatoare).

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

Capacitate de rupere: 6cel, safely interrupting short-circuit fault currents to prevent contact welding or equipment damage.

2. Technical Standards

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

– Interval de temperatură de funcționare: -35°C to 70°C, adapting to temperature fluctuations in industrial environments.

1. Scenarii de aplicare

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 (de ex., welding machines, transformatoare), enabling rapid response to fault currents.

III. Installation and Usage Recommendations

1. Cerințe de instalare

– 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 (de ex., 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 (de ex., 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

Capacitate de rupere: 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 (de ex., 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.

Certificari: 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. Precauții

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

Conformitatea cu certificarea: For use in the U.S., verify whether the product is UL-certified or choose other models compliant with North American standards (de ex., Siemens 5SJ6 series).

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

(Compiled from official data and industry standards)

1. Parametrii electrici de bază
2. Tensiune nominală: AC 400V (three-phase system), suitable for 380V/400V power distribution scenarios; not for single-phase 230V circuits.
3. Curent nominal: 63O, matching continuous operation of high-power equipment (de ex., motoare, transformatoare).
4. Trip Characteristic: Type D curve, instantaneous trip current 10–16× rated current, effectively handling motor starting inrush currents.
5. Capacitate de rupere: 6cel (compliant with IEC 60898-1), safely interrupting short-circuit fault currents.
6. Parametri mecanici și de mediu
7. Poles: 3P (three-phase), suitable for three-phase four-wire power distribution systems.
8. Viața mecanică: 20,000 operațiuni; Viața electrică: 10,000 operațiuni, ensuring long-term stable operation.
9. Temperatura de operare: -35°C până la +70°C, adapting to industrial temperature fluctuations.
10. Metoda de instalare: Montare standard pe șină de 35 mm, 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 (de ex., Siemens 5SJ6 series).
3. Accessories and Extended Functions
4. Contacte auxiliare: Supports accessories like AX-X1 (1NU+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

Dimensiuni: 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. Note
2. Potrivirea tensiunii: Only for 400V three-phase systems; not for single-phase 230V circuits.
3. Protecție la suprasarcină: 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.