• The CHINT NXB-63H series Miniature Circuit Breaker (MCB) is a robust and reliable protective device engineered for three-phase AC 50Hz or 60Hz electrical circuits.
• This 3-Pole variant boasts a high 10kA short-circuit breaking capacity (Icu), providing essential overload and short-circuit protection for three-phase loads.
• Available in a specific range of rated currents including 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A, the NXB-63H 3P is designed for demanding applications.
• Its compliance with IEC/EN 60898-1 standards and positive isolation feature ensure safety and dependable performance in commercial and industrial environments.

Features

• High Breaking Capacity: 10,000A (10kA) rated short-circuit breaking capacity (Icu) and 7,500A (Ics).
• Specific Current Range (3-Pole): Available in rated currents: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A.
• Number of Poles: 3-Pole (3P).
• Tripping Curves: Available in B, C, and D thermal magnetic release characteristics for diverse load protection.
• Voltage Rating (3-Pole): AC 380V / 400V / 415V.
• Compliance: Meets IEC/EN 60898-1 international standards.
• Certifications: CE, SII, RoHS, Carbon Footprint.
• Positive Isolation: Guarantees complete circuit disconnection on all three poles for enhanced safety during maintenance.
• Long Operational Life: Engineered for 20,000 mechanical cycles and 10,000 electrical cycles.
• Convenient Installation: Designed for standard TH35-7.5 DIN rail mounting.
• Clear Status Indication: Red (ON) / Green (OFF) visual indication for each pole.
• Wide Operating Temperature Range: Suitable for use from -35°C to +70°C.
• Generous Terminal Capacity: Accommodates copper wires from 1mm² up to 25mm².

Benefits

• Three-Phase Protection: Provides comprehensive protection for three-phase motors, equipment, and distribution circuits against overcurrents and short circuits.
• Enhanced System Safety: Minimizes the risk of damage to expensive three-phase machinery and reduces potential fire hazards.
• Reliability Assured: Certified and compliant with recognized international standards, offering peace of mind regarding performance and quality.
• Durable and Long-Lasting: High mechanical and electrical endurance ensures extended service life and consistent operational integrity.
• Simplified Installation & Use: Easy DIN rail mounting and clear visual status indicators make installation and operation user-friendly.
• Versatile Wiring Options: Substantial terminal capacity allows for flexibility in selecting appropriate copper wire sizes.
• Safe Maintenance Procedures: The positive isolation feature across all three poles ensures the circuit is safely de-energized when required.

In-Depth Technical Specifications

Ideal Use

• Three-Phase Motors: Protecting small to medium-sized three-phase motors in industrial and commercial applications.
• Three-Phase Distribution Panels: As main or sub-circuit protection in three-phase electrical distribution boards.
• HVAC Systems: Protecting three-phase components within larger heating, ventilation, and air conditioning units.
• Industrial Machinery: Safeguarding various types of three-phase powered machinery and equipment.
• Commercial Kitchen Equipment: Protecting three-phase ovens, cooktops, and other heavy-duty appliances.
  • Type B Curve: Suitable for circuits with primarily resistive loads or very low inrush currents.
  • Type C Curve: General-purpose protection for most three-phase loads with moderate inrush currents.
  • Type D Curve: For circuits with high inrush currents, such as those involving transformers or specific motor types (always verify compatibility).

Tips

• Qualified Installation: Installation, wiring, and maintenance must be carried out exclusively by qualified electrical professionals.
• Ensure Power is Off: Always completely de-energize the circuit by switching off the main power supply before commencing any installation or maintenance activities.
• Use Copper Wires: Only copper conductors should be used. Select the correct wire cross-sectional area for each phase based on the rated current and the connected load. Tighten terminal screws to the specified torque (2.0 N·m) to ensure secure connections.
• Suitable Environment: Avoid installation in environments with excessive moisture, condensation, or the presence of flammable, explosive, or corrosive gases that could degrade the MCB's components.
• Heavy Inductive Loads: This MCB is not intended for direct starting of very large high-inductive or high-capacity loads without appropriate upstream motor starters or control gear.
• Temperature Derating: For operation in ambient temperatures significantly different from the 30°C reference, refer to the manufacturer's temperature derating information (e.g., for a 10-25A NXB-63H MCB, at 40°C ambient, the rated current is typically derated by a factor of 0.96).
• Fault Resolution: If the MCB trips due to an overload or short-circuit, thoroughly investigate and resolve the underlying fault before attempting to re-close the breaker.
• Routine Checks: Periodically inspect the circuit breaker for any signs of physical damage, overheating at terminals, or discoloration.
• Eco-Friendly Disposal: When the product reaches the end of its service life, dispose of it and its parts in accordance with local environmental regulations and industrial waste treatment procedures.