Contattore,interruttore automatico,inverter solare,contatore elettrico,batterie solari
- Panoramica del prodotto
Chint NA8 series Air Circuit Breakers (ACB) are the fully upgraded version of the NA1 series, integrating high breaking capacity, zero arcing design, 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, sottotensione, cortocircuito, single-phase grounding, e altri difetti. They are particularly suitable for scenarios with extreme environments, large-capacity power distribution, and high intelligent requirements.
- Parametri tecnici fondamentali
2.1 Parametri elettrici di base
| Parametro | Specifica | Osservazioni |
| Rated Frame Current (Inm) | 1600UN, 2500UN, 3200UN, 4000UN, 7500UN | Covers the entire product series |
| Corrente operativa nominale (In) | 200A~7500A | Different current ratings for each frame size |
| Tensione operativa nominale (Ue) | CA 400 V/690 V | AC 690V for 3200/6300 specifications is under trial production |
| Tensione di isolamento nominale (Ui) | AC 1000V | Meets high-voltage insulation requirements |
| Frequenza nominale | 50Hz | Standard industrial frequency |
| Numero di poli | 3P/4P | Rated current of the 4th pole is selectable |
| Classe del potere di interruzione | N (Standard), H (High Breaking), HU (High-Voltage High Breaking) | H class is available for 2500A and above |
| Capacità di interruzione massima nominale in cortocircuito (terapia intensiva) | Up to 150kA | Icu=Ics=Icw/1s (for some specifications) |
| Capacità di interruzione nominale del servizio in cortocircuito (IC) | Up to 150kA | 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 |
| Grado di inquinamento | Classe 3 | Conforme a GB/T 14048.1 e CEI 60664-1 standard |
| Grado di protezione | IP30 | Standard protection level, can be enhanced with accessories |
2.2 Detailed Parameters by Frame Size
NA8-1600 Series
| Corrente nominale (UN) | 200 | 400 | 630 | 800 | 1000 | 1250 | 1600 |
| Capacità di interruzione (terapia intensiva) | 55IL(400V) | 55IL(400V) | 55IL(400V) | 55IL(400V) | 55IL(400V) | 55IL(400V) | 55IL(400V) |
| Rated Current of the 4th Pole | 200UN | 400UN | 630UN | 800UN | 1000UN | 1250UN | 1600UN |
NA8-2500/3200/4000 Series
| Dimensioni del telaio | Intervallo di corrente nominale | terapia intensiva(400V) | terapia intensiva(690V) |
| 2500UN | 1000~2500A | 100IL(N)/125IL(H) | 75IL(N)/85IL(H) |
| 3200UN | 1600~3200A | 100IL(N)/125IL(H) | 75IL(N)/85IL(H) |
| 4000UN | 2000~4000A | 100IL(N)/125IL(H) | 75IL(N)/85IL(H) |
NA8-7500 Series
| Corrente nominale (UN) | 4000 | 5000 | 6300 | 7500 |
| terapia intensiva(400V) | 150IL | 150IL | 150IL | 150IL |
| terapia intensiva(690V) | 100IL | 100IL | 100IL | 100IL |
III. Breaking Characteristics and Arc Extinguishing System
- Design ad arco zero: Optimized arc extinguishing chamber structure ensures no arc ejection from the breaker body during short-circuit breaking, improving safety.
- Sistema di contatto: 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.
- Funzioni di protezione intelligente
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, monitoraggio armonico, and current fault early warning.
4.1 List of Protection Functions
| Tipo di protezione | Descrizione della funzione | Caratteristiche operative |
| Protezione da sovraccarico (l) | Caratteristica del tempo inverso, with three-stage protection (IO>, IO>>, IO>>>) configurable | Conforme a GB/T 14048.2 standard |
| Protezione da cortocircuito (S/I) | Ritardo di breve durata (S) and instantaneous (IO) protezione, with configurable thresholds | Short-time delay adjustable from 0.1~0.4s, instantaneous with no delay |
| Protezione dai guasti a terra (G) | Detects single-phase ground faults, with alarm or trip options available | High sensitivity and reliable operation |
| Protezione da sottotensione | Detects low line voltage, with configurable delayed operation | Prevents equipment damage under low voltage conditions |
| Protezione da sovratensione | Detects high line voltage, with configurable delayed operation | Protects sensitive equipment |
| Protezione da mancanza di fase | Detects three-phase current imbalance, preventing motor operation under phase loss conditions | Accurate operation, evitando il burnout del motore |
| 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, attuale, and time | Facilitates fault analysis and maintenance |
4.2 Types of Intelligent Controllers
| Controller Type | Scenario applicativo | Funzioni |
| Tipo M | Basic protection requirements | Provides basic protection such as overload, cortocircuito, e protezione dai guasti a terra |
| Tipo S | Standard protection requirements | Adds functions like fault recording and parameter configuration |
| Tipo L | Advanced protection requirements | Supports harmonic monitoring, remote communication, and current fault early warning |
- Caratteristiche di installazione e funzionamento
5.1 Metodi di installazione
| Installation Type | Scenario applicabile | Caratteristiche |
| Tipo fisso | Spazio limitato, no frequent maintenance required | Simple installation and low cost |
| Tipo estraibile | Occasions requiring frequent inspection and replacement | Can be pulled out for maintenance without cutting off the main power supply, migliorare la continuità dell’alimentazione |
5.2 Metodi di cablaggio
- Horizontal Connection: Standard wiring method, suitable for most scenarios.
- Vertical Connection: Risparmia spazio di installazione, ideal for compact distribution cabinet layouts.
- Mixed Connection: Flexible combination according to actual requirements.
5.3 Metodi operativi
| Operation Type | Caratteristiche | Scenario applicabile |
| Funzionamento manuale | Mechanical handle operation, no power supply required | Standby operation method, suitable for emergency situations |
| Electric Operation | Motor-driven, supporta il controllo remoto | High automation level, suitable for unattended occasions |
| Stored-Energy Operation | Spring energy storage mechanism, fast closing and opening speed | Improves breaking reliability, adatto per occasioni operative frequenti |
- Mechanical and Environmental Characteristics
| Parametro | Specifica | Osservazioni |
| Vita utile meccanica | 10,000 operazioni (drawout type), 20,000 operazioni (tipo fisso) | Complies with national standards |
| Vita utile elettrica | 1,000 operazioni (alla corrente nominale) | Optimized contact system, extended service life |
| Meccanismo operativo | Spring energy storage type | Fast closing and opening speed, not affected by power supply |
| Interblocco meccanico | Optimized design, ensuring operation safety | Prevents misoperation and improves reliability |
| Connettore secondario | Improved design, contatto affidabile | Special for drawout installation, stable connection |
| Altitudine | ≤2000m | Derating required when exceeding 2000m |
| Umidità relativa | ≤95% (a 25°C) | Adaptable to humid environments |
| Vibration and Shock Resistance | Conforme a GB/T 14048.1 standard | Adaptable to industrial vibration environments |
VII. Sistema di accessori
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
| Nome dell'accessorio | Funzione | Esempio di modello |
| Viaggio di derivazione | Remote control of breaker tripping | NA8-F |
| Rilascio di sottotensione | Automatic tripping when line voltage is undervoltage | NA8-U |
| Overvoltage Release | Automatic tripping when line voltage is overvoltage | NA8-OV |
| Contatto di allarme | Sends alarm signal in case of faults | NA8-AL |
| Contatto ausiliario | Provides breaker status signal | NA8-AX (2 normalmente aperto, 2 normalmente chiuso) |
7.2 Operation Accessories
| Nome dell'accessorio | Funzione | Scenario applicabile |
| Meccanismo di comando elettrico | Motor-driven closing and opening | Automatic control systems |
| Maniglia operativa rotante | 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 Accessori di protezione
| Nome dell'accessorio | Funzione | Esempio di modello |
| 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 |
| Sensore di temperatura | Monitors breaker temperature to prevent overheating | NA8-TS |
VIII. Guida alla selezione
8.1 Selection by Breaking Capacity
| Classe del potere di interruzione | Scenario applicabile | Icu Value (400V) |
| Digitare N (Standard) | Conventional power distribution systems with short-circuit current ≤100kA | 55~100kA |
| Tipo H (High Breaking) | Occasioni con grande corrente di cortocircuito, per esempio., 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
| Dimensioni del telaio | Intervallo di corrente nominale | Scenario applicabile |
| 1600UN | 200~1600A | Small-sized factories, edifici commerciali |
| 2500UN | 1000~2500A | Medium-sized factories, high-rise buildings |
| 3200UN | 1600~3200A | Large-sized factories, centri dati |
| 4000UN | 2000~4000A | Extra-large factories, regional energy centers |
| 7500UN | 4000~7500A | Ultra-large factories, power grid hubs |
8.3 Selection by Installation Method
– Tipo estraibile: Recommended for occasions requiring frequent maintenance and breaker replacement, such as critical power distribution circuits.
– Tipo fisso: Recommended for occasions with limited space and low maintenance frequency, such as general power distribution circuits.
- Core Differences from NA1 Series
Elemento di confronto NA8 Series NA1 Series Descrizione del vantaggio Maximum Rated Current 7500UN 6300UN Covers larger capacity scenarios Capacità di interruzione Up to 150kA Up to 100kA 50% improvement, more reliable short-circuit protection Adattabilità ambientale -45°C~+70°C -5°C~+40°C Significantly enhanced adaptability to extreme environments Intelligence Level 8-time fault recording, monitoraggio armonico, early warning Basic protection functions Comprehensive improvement in intelligence level Tecnologia di estinzione dell'arco Zero arcing design with optimized arc extinguishing chamber Standard arc extinguishing design Higher safety, reduced installation distance Sistema di contatto New material and structure Traditional design Extended electrical service life, lower maintenance cost - Recommended Application Scenarios
- Extreme Environment Scenarios: 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.
- High Short-Circuit Risk Scenarios: 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.
- Informazioni sull'ordinazione
Complete model designation of NA8 series products: NA8-Frame Size-Rated Current-Breaking Capacity/Pole Number-Installation Method-Controller Type
Esempio: NA8-7500-5000H/4P-Drawout Type-Type L Controller
XII. Standard esecutivi
The product complies with the following national and international standards:
- GB/T 14048.2-2018 Low-voltage Switchgear and Controlgear – Parte 2: Interruttori
- CEI 60947-2:2019 Apparecchiature di manovra e controllo a bassa tensione – Parte 2: Interruttori
