CHINT ac circuit breaker
CHINT AC circuit breakers are designed to protect electrical systems from overloads, short circuits, and other faults in alternating current (AC) environments. These devices are widely used in residential, commercial, and industrial applications due to their reliability, safety features, and compliance with international standards. Here's a detailed overview:
1. Key Product Lines**
CHINT offers a range of AC circuit breakers tailored to different voltage and current requirements:
- **Miniature Circuit Breakers (MCB)**:
- **NXB-63 Series**: Suitable for residential and light commercial use, with rated currents up to 63A and breaking capacities of 6–10kA. Features include thermal-magnetic tripping (Type C/D curves) for general loads or inductive loads like motors .
- **NB8-125 Series**: Compact design for distribution lines in offices and industrial settings, supporting up to 125A and compliant with IEC 60947-2 .
- **Molded Case Circuit Breakers (MCCB)**:
- **NXB-125 Series**: Industrial-grade MCCBs with rated currents from 63A to 125A, offering overload and short-circuit protection. They feature a mechanical life of 20,000 cycles and comply with IEC 60947-2 .
- **NM1 Series**: High-performance MCCBs for medium-power applications, available in 3P/4P configurations with breaking capacities up to 50kA .
- **Air Circuit Breakers (ACB)**:
- **NA1 Series**: Heavy-duty ACBs for high-power systems (up to 6300A), used in power stations, factories, and smart buildings. They support intelligent protection (LSI: Long-time, Short-time, Instantaneous) and comply with IEC 60947-2 .
2. Core Features**
- **Overload & Short-Circuit Protection**:
- **Thermal-Magnetic Tripping**: Combines bimetallic strips (for overloads) and electromagnetic coils (for short circuits) to ensure rapid response.
- **Adjustable Trip Settings**: Some models (e.g., NA1 series) allow customization of trip thresholds and delay times for specific load requirements .
- **Safety & Compliance**:
- **Arc Extinction**: Advanced arc quenching mechanisms prevent damage during fault interruptions.
- **Certifications**: CE, CB, RoHS, and UL approvals ensure compatibility with global standards .
- **Durability**:
- **High Breaking Capacity**: NXB-125 series achieves 10kA breaking capacity, while NA1 series handles up to 100kA .
- **Longevity**: Mechanical life of 20,000 cycles for MCCBs and 10,000 cycles for ACBs .
3. Application Scenarios**
- **Residential**:
- NXB-63 series for household distribution boards, protecting lighting, appliances, and small motors.
- Type C curves (5–10× rated current) suit general loads, while Type D (10–20×) handle inductive loads like refrigerators .
- **Commercial & Industrial**:
- NB8-125 series in office buildings and workshops for branch circuit protection.
- NA1 series in data centers and factories for main distribution panels, offering selective coordination to minimize downtime .
- **Renewable Energy**:
- Suitable for solar inverter systems and microgrids, ensuring safe operation under fluctuating loads .
4. Smart & Advanced Features**
- **Intelligent Testing**:
- CHINT’s **Smart Handheld Test Unit** allows offline simulation of fault currents, enabling safe validation of ACB performance without live testing .
- Supports automatic analysis and report generation for maintenance records.
- **Remote Monitoring**:
- Some ACBs (e.g., NA1 series) integrate communication interfaces (e.g., Modbus) for remote control and diagnostics in smart grids .
5. Technical Specifications**
| Series | Type | Rated Current | Voltage | Breaking Capacity | Certifications |
| NXB-63 | MCB | 1–63A | 230/400V AC | 6–10kA | CE, CB, RoHS 14 |
| NXB-125 | MCCB | 63–125A | 400V AC | 10kA | CE, UL 11 |
| NA1 | ACB | 200–6300A | 400/690V AC | 25–100kA | IEC 60947-2 |
6. Selection & Maintenance Tips**
- **Choosing the Right Breaker**:
- Match the breaker’s rated current to the load (e.g., 16A for a 3kW motor).
- For inductive loads, select Type D curves to avoid nuisance tripping .
nstallation**:
- Follow CHINT’s guidelines for DIN rail mounting and proper wiring .
- Ensure adequate ventilation for high-current applications.
- **Maintenance**:
- Regularly inspect contacts for wear and tighten connections.
- Use the Smart Handheld Test Unit to verify trip characteristics .
7. Comparison with DC Circuit Breakers**
| Feature | AC Circuit Breaker | DC Circuit Breaker |
| Arc Extinction | Relies on zero-crossing of AC current | Requires additional arc chutes or magnetic blowout |
| Typical Use | Homes, offices, industrial grids | Solar systems, battery banks, automotive |
| Voltage Range | 230–690V AC | 12–1500V DC |
| Certifications | CE, UL, IEC 60947-2 | IEC 60947-2 (DC variants) |
Conclusion**
CHINT’s AC circuit breakers provide a balance of safety, reliability, and versatility for diverse applications. From compact MCBs for residential use to high-performance ACBs for industrial grids, they offer advanced protection features and compliance with global standards. For critical systems, consider models with intelligent testing and remote monitoring capabilities to enhance efficiency and reduce downtime. Always consult CHINT’s technical documentation or a certified electrician for specific installations.
