Contactor,întrerupător de circuit,invertor solar,contor electric,baterii solare
- Prezentare generală a produsului
Chint NA8 series Air Circuit Breakers (ACB) are the fully upgraded version of the NA1 series, integrating high breaking capacity, design cu arc zero, and intelligent protection. With a rated current range of 200A to 7500A, these breakers are applicable to 50Hz power distribution networks with rated voltages of 400V/690V. They are mainly used for power distribution and protecting lines and equipment against overload, subtensiune, scurt-circuit, single-phase grounding, and other faults. They are particularly suitable for scenarios with extreme environments, large-capacity power distribution, and high intelligent requirements.
- Parametrii tehnici de bază
2.1 Parametrii electrici de bază
| Parametru | Caietul de sarcini | Observații |
| Rated Frame Current (Inm) | 1600O, 2500O, 3200O, 4000O, 7500O | Covers the entire product series |
| Curent nominal de operare (În) | 200A~7500A | Different current ratings for each frame size |
| Tensiune nominală de operare (Ue) | AC 400V/690V | AC 690V for 3200/6300 specifications is under trial production |
| Tensiune nominală de izolație (Ui) | AC 1000V | Meets high-voltage insulation requirements |
| Frecvența nominală | 50Hz | Standard industrial frequency |
| Numărul de pol | 3P/4P | Rated current of the 4th pole is selectable |
| Breaking Capacity Class | N (Standard), H (High Breaking), HU (High-Voltage High Breaking) | H class is available for 2500A and above |
| Capacitate maximă de întrerupere în scurtcircuit (Icu) | Până la 150 kA | Icu=Ics=Icw/1s (pentru unele specificatii) |
| Capacitate nominală de întrerupere a scurtcircuitului de serviciu (Ics) | Până la 150 kA | Same as Icu, with better protection coordination |
| Rated Short-Time Withstand Current (Icw) | Up to 150kA/1s | Meets stringent short-circuit impact requirements |
| Ambient Temperature for Use | -45°C ~ +70°C | Far superior to NA1 (-5°C~+40°C), adaptable to extreme environments |
| Gradul de poluare | Clasă 3 | Respectă GB/T 14048.1 și IEC 60664-1 standardele |
| Protection Degree | IP30 | Standard protection level, can be enhanced with accessories |
2.2 Detailed Parameters by Frame Size
NA8-1600 Series
| Curent nominal (O) | 200 | 400 | 630 | 800 | 1000 | 1250 | 1600 |
| Capacitate de rupere (Icu) | 55cel(400V) | 55cel(400V) | 55cel(400V) | 55cel(400V) | 55cel(400V) | 55cel(400V) | 55cel(400V) |
| Rated Current of the 4th Pole | 200O | 400O | 630O | 800O | 1000O | 1250O | 1600O |
NA8-2500/3200/4000 Series
| Frame Size | Gama de curent nominal | Icu(400V) | Icu(690V) |
| 2500O | 1000~2500A | 100cel(N)/125cel(H) | 75cel(N)/85cel(H) |
| 3200O | 1600~3200A | 100cel(N)/125cel(H) | 75cel(N)/85cel(H) |
| 4000O | 2000~4000A | 100cel(N)/125cel(H) | 75cel(N)/85cel(H) |
NA8-7500 Series
| Curent nominal (O) | 4000 | 5000 | 6300 | 7500 |
| Icu(400V) | 150cel | 150cel | 150cel | 150cel |
| Icu(690V) | 100cel | 100cel | 100cel | 100cel |
III. Breaking Characteristics and Arc Extinguishing System
- Design zero arc: Optimized arc extinguishing chamber structure ensures no arc ejection from the breaker body during short-circuit breaking, improving safety.
- Contact System: Adopts new material and structural design, significantly extending electrical service life and reducing maintenance costs.
- Arc Extinguishing Medium: Air arc extinguishing, combined with special arc extinguishing grids, featuring fast breaking speed and strong breaking capacity.
- Breaking Time: Short-circuit breaking time ≤20ms, quickly cutting off faults and reducing equipment damage.
- Funcții inteligente de protecție
The NA8 series is equipped with M/S/L-type intelligent controllers, providing comprehensive protection functions. Some models support advanced features such as 8-time fault recording, monitorizare armonică, și avertizare timpurie de defecțiune curentă.
4.1 List of Protection Functions
| Protection Type | Descrierea funcției | Operating Characteristics |
| Protecție la suprasarcină (L) | Inverse-time characteristic, with three-stage protection (eu>, eu>>, eu>>>) configurable | Respectă GB/T 14048.2 standard |
| Protecție la scurtcircuit (S/I) | Short-time delay (S) and instantaneous (eu) protecţie, with configurable thresholds | Short-time delay adjustable from 0.1~0.4s, instantaneous with no delay |
| Protecție împotriva defecțiunii la pământ (G) | Detects single-phase ground faults, with alarm or trip options available | High sensitivity and reliable operation |
| Protecție la subtensiune | Detects low line voltage, with configurable delayed operation | Prevents equipment damage under low voltage conditions |
| Protecție la supratensiune | Detects high line voltage, with configurable delayed operation | Protects sensitive equipment |
| Protecție împotriva erorilor de fază | Detects three-phase current imbalance, preventing motor operation under phase loss conditions | Accurate operation, avoiding motor burnout |
| Harmonic Monitoring | Supported by some models, monitors grid harmonic content | Early warning of power quality issues |
| Fault Recording | Can record 8 fault events, including fault type, actual, and time | Facilitates fault analysis and maintenance |
4.2 Types of Intelligent Controllers
| Controller Type | Scenariul aplicației | Funcții |
| Type M | Basic protection requirements | Provides basic protection such as overload, scurt-circuit, și protecție împotriva defecțiunii la pământ |
| Tip S | Standard protection requirements | Adds functions like fault recording and parameter configuration |
| Type L | Advanced protection requirements | Supports harmonic monitoring, remote communication, și avertizare timpurie de defecțiune curentă |
- Caracteristici de instalare și funcționare
5.1 Metode de instalare
| Installation Type | Applicable Scenario | Caracteristici |
| Fixed Type | Limited space, no frequent maintenance required | Simple installation and low cost |
| Drawout Type | Occasions requiring frequent inspection and replacement | Can be pulled out for maintenance without cutting off the main power supply, improving power supply continuity |
5.2 Metode de cablare
- Horizontal Connection: Standard wiring method, suitable for most scenarios.
- Vertical Connection: Saves installation space, ideal for compact distribution cabinet layouts.
- Mixed Connection: Flexible combination according to actual requirements.
5.3 Metode de operare
| Operation Type | Caracteristici | Applicable Scenario |
| Manual Operation | Mechanical handle operation, no power supply required | Standby operation method, suitable for emergency situations |
| Electric Operation | Motor-driven, supports remote control | High automation level, suitable for unattended occasions |
| Stored-Energy Operation | Spring energy storage mechanism, fast closing and opening speed | Improves breaking reliability, potrivit pentru ocazii frecvente de operare |
- Caracteristici mecanice și de mediu
| Parametru | Caietul de sarcini | Observații |
| Durată de viață mecanică | 10,000 operațiuni (drawout type), 20,000 operațiuni (fixed type) | Complies with national standards |
| Durată de viață electrică | 1,000 operațiuni (at rated current) | Optimized contact system, extended service life |
| Operating Mechanism | Spring energy storage type | Fast closing and opening speed, not affected by power supply |
| Mechanical Interlock | Optimized design, ensuring operation safety | Prevents misoperation and improves reliability |
| Secondary Connector | Improved design, reliable contact | Special for drawout installation, stable connection |
| Altitudine | ≤2000m | Derating required when exceeding 2000m |
| Relative Humidity | ≤95% (la 25°C) | Adaptable to humid environments |
| Vibration and Shock Resistance | Respectă GB/T 14048.1 standard | Adaptable to industrial vibration environments |
VII. Accessory System
The NA8 series supports a rich range of accessories to meet different application requirements, and some accessories are compatible with the NA1 series.
7.1 Release Accessories
| Accessory Name | Funcţie | Model Example |
| Shunt Trip | Remote control of breaker tripping | NA8-F |
| Undervoltage Release | Automatic tripping when line voltage is undervoltage | NA8-U |
| Overvoltage Release | Automatic tripping when line voltage is overvoltage | NA8-OV |
| Alarm Contact | Sends alarm signal in case of faults | NA8-AL |
| Auxiliary Contact | Provides breaker status signal | NA8-AX (2 deschis în mod normal, 2 în mod normal închis) |
7.2 Operation Accessories
| Accessory Name | Funcţie | Applicable Scenario |
| Electric Operating Mechanism | Motor-driven closing and opening | Automatic control systems |
| Rotary Operating Handle | Manual operation of the breaker | On-site operation |
| Locking Device | Locks breaker status to prevent misoperation | Occasions with high safety requirements |
| Padlocking Device | Allows padlocking to prevent unauthorized operation | Public places or critical equipment |
7.3 Protection Accessories
| Accessory Name | Funcţie | Model Example |
| Leakage Current Transformer (LEC) | Detects leakage current, achieving residual current protection in conjunction with the controller | NA8-LEC |
| Residual Current Protection Module | Provides residual current protection function | NA8-RCM |
| Temperature Sensor | Monitors breaker temperature to prevent overheating | NA8-TS |
VIII. Ghid de selecție
8.1 Selection by Breaking Capacity
| Breaking Capacity Class | Applicable Scenario | Icu Value (400V) |
| Type N (Standard) | Conventional power distribution systems with short-circuit current ≤100kA | 55~100kA |
| Tip H (High Breaking) | Occasions with large short-circuit current, de ex., near transformers | 125~150kA |
| Type HU (High-Voltage High Breaking) | 690V systems with large short-circuit current | 75~85kA |
8.2 Selection by Frame Size
| Frame Size | Gama de curent nominal | Applicable Scenario |
| 1600O | 200~1600A | Small-sized factories, clădiri comerciale |
| 2500O | 1000~2500A | Medium-sized factories, high-rise buildings |
| 3200O | 1600~3200A | Large-sized factories, centre de date |
| 4000O | 2000~4000A | Extra-large factories, regional energy centers |
| 7500O | 4000~7500A | Ultra-large factories, power grid hubs |
8.3 Selection by Installation Method
– Drawout Type: Recommended for occasions requiring frequent maintenance and breaker replacement, such as critical power distribution circuits.
– Fixed Type: Recommended for occasions with limited space and low maintenance frequency, such as general power distribution circuits.
- Core Differences from NA1 Series
Element de comparație Seria NA8 Seria NA1 Advantage Description Maximum Rated Current 7500O 6300O Covers larger capacity scenarios Capacitate de rupere Până la 150 kA Până la 100 kA 50% improvement, more reliable short-circuit protection Adaptabilitate la mediu -45°C~+70°C -5°C~+40°C Significantly enhanced adaptability to extreme environments Intelligence Level 8-time fault recording, monitorizare armonică, early warning Basic protection functions Comprehensive improvement in intelligence level Tehnologia de stingere a arcului Zero arcing design with optimized arc extinguishing chamber Standard arc extinguishing design Higher safety, reduced installation distance Contact System New material and structure Design tradițional Extended electrical service life, lower maintenance cost - Recommended Application Scenarios
- Scenarii de mediu extrem: Frigid regions (-45°C), high-temperature environments (+70°C), high-humidity/salt spray environments (coastal areas/chemical industrial parks).
- Large-Capacity Power Distribution Scenarios: Ultra-large factories (steel/automotive/semiconductor), data centers/cloud computing facilities, regional energy centers.
- Scenarii cu risc ridicat de scurtcircuit: Proximal ends of generators/transformers (short-circuit current 120-150kA), power grid interconnection nodes, industrial heavy-load starting occasions.
- High Intelligence Demand Scenarios: Predictive maintenance, smart grid integration, complex power distribution systems with enhanced safety interlocks.
- NA1 Upgrade Scenarios: Projects where the original NA1 system needs capacity expansion above 6300A, where environmental conditions are harsh, or where intelligence level needs to be improved.
- Informații de comandă
Complete model designation of NA8 series products: NA8-Frame Size-Rated Current-Breaking Capacity/Pole Number-Installation Method-Controller Type
Exemplu: NA8-7500-5000H/4P-Drawout Type-Type L Controller
XII. Standarde executive
The product complies with the following national and international standards:
- GB/T 14048.2-2018 Low-voltage Switchgear and Controlgear – Parte 2: Circuit-breakers
- IEC 60947-2:2019 Low-voltage switchgear and controlgear – Parte 2: Circuit-breakers
