Contacteur,disjoncteur,onduleur solaire,compteur électrique,batteries solaires
- Présentation du produit
Chint NA8 series Air Circuit Breakers (PBR) are the fully upgraded version of the NA1 series, integrating high breaking capacity, conception sans arc, 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, sous-tension, court-circuit, single-phase grounding, and other faults. They are particularly suitable for scenarios with extreme environments, large-capacity power distribution, and high intelligent requirements.
- Paramètres techniques de base
2.1 Paramètres électriques de base
| Paramètre | Spécification | Remarques |
| Rated Frame Current (Inm) | 1600UN, 2500UN, 3200UN, 4000UN, 7500UN | Covers the entire product series |
| Courant de fonctionnement nominal (Dans) | 200UN ~ 7500A | Different current ratings for each frame size |
| Tension de fonctionnement nominale (Ue) | C.A. 400 V/690 V | AC 690V for 3200/6300 specifications is under trial production |
| Tension d'isolation nominale (Interface utilisateur) | AC 1000V | Meets high-voltage insulation requirements |
| Fréquence nominale | 50Hz | Standard industrial frequency |
| Numéro de pôle | 3P/4P | Rated current of the 4th pole is selectable |
| Classe de capacité de coupure | N (Standard), H (High Breaking), HU (High-Voltage High Breaking) | H class is available for 2500A and above |
| Capacité nominale ultime de coupure de court-circuit (ICU) | Jusqu'à 150 kA | Icu=Ics=Icw/1s (pour certaines spécifications) |
| Rated Service Short-Circuit Breaking Capacity (Ics) | Jusqu'à 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 |
| Degré de pollution | Classe 3 | Complies with GB/T 14048.1 et CEI 60664-1 normes |
| Protection Degree | IP30 | Standard protection level, can be enhanced with accessories |
2.2 Detailed Parameters by Frame Size
NA8-1600 Series
| Courant nominal (UN) | 200 | 400 | 630 | 800 | 1000 | 1250 | 1600 |
| Capacité de coupure (ICU) | 55le(400V) | 55le(400V) | 55le(400V) | 55le(400V) | 55le(400V) | 55le(400V) | 55le(400V) |
| Rated Current of the 4th Pole | 200UN | 400UN | 630UN | 800UN | 1000UN | 1250UN | 1600UN |
NA8-2500/3200/4000 Series
| Taille du cadre | Plage de courant nominal | ICU(400V) | ICU(690V) |
| 2500UN | 1000~2500A | 100le(N)/125le(H) | 75le(N)/85le(H) |
| 3200UN | 1600~3200A | 100le(N)/125le(H) | 75le(N)/85le(H) |
| 4000UN | 2000~4000A | 100le(N)/125le(H) | 75le(N)/85le(H) |
NA8-7500 Series
| Courant nominal (UN) | 4000 | 5000 | 6300 | 7500 |
| ICU(400V) | 150le | 150le | 150le | 150le |
| ICU(690V) | 100le | 100le | 100le | 100le |
III. Breaking Characteristics and Arc Extinguishing System
- Zero Arcing Design: Optimized arc extinguishing chamber structure ensures no arc ejection from the breaker body during short-circuit breaking, improving safety.
- Système de contact: 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.
- Temps de pause: Short-circuit breaking time ≤20ms, quickly cutting off faults and reducing equipment damage.
- Fonctions de protection intelligentes
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, surveillance des harmoniques, et alerte précoce de défaut actuel.
4.1 List of Protection Functions
| Type de protection | Description de la fonction | Caractéristiques de fonctionnement |
| Protection contre les surcharges (L) | Caractéristique à temps inverse, with three-stage protection (je>, je>>, je>>>) configurable | Complies with GB/T 14048.2 standard |
| Protection contre les courts-circuits (S/I) | Short-time delay (S) and instantaneous (je) protection, with configurable thresholds | Short-time delay adjustable from 0.1~0.4s, instantaneous with no delay |
| Protection contre les défauts à la terre (G) | Detects single-phase ground faults, with alarm or trip options available | High sensitivity and reliable operation |
| Protection contre les sous-tensions | Detects low line voltage, with configurable delayed operation | Prevents equipment damage under low voltage conditions |
| Protection contre les surtensions | Detects high line voltage, with configurable delayed operation | Protects sensitive equipment |
| Phase Failure Protection | Detects three-phase current imbalance, preventing motor operation under phase loss conditions | Accurate operation, éviter l'épuisement moteur |
| 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, actuel, and time | Facilitates fault analysis and maintenance |
4.2 Types of Intelligent Controllers
| Controller Type | Scénario d'application | Fonctions |
| Type M | Basic protection requirements | Provides basic protection such as overload, court-circuit, and ground fault protection |
| Tapez S | Standard protection requirements | Adds functions like fault recording and parameter configuration |
| Type L | Advanced protection requirements | Supports harmonic monitoring, remote communication, et alerte précoce de défaut actuel |
- Caractéristiques d'installation et de fonctionnement
5.1 Méthodes d'installation
| Type d'installation | Scénario applicable | Caractéristiques |
| Type fixe | 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, amélioration de la continuité de l'alimentation électrique |
5.2 Méthodes de câblage
- 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 Méthodes de fonctionnement
| Operation Type | Caractéristiques | Scénario applicable |
| 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, suitable for frequent operation occasions |
- Mechanical and Environmental Characteristics
| Paramètre | Spécification | Remarques |
| Durée de vie mécanique | 10,000 opérations (drawout type), 20,000 opérations (fixed type) | Complies with national standards |
| Durée de vie électrique | 1,000 opérations (au courant nominal) | Optimized contact system, extended service life |
| Mécanisme de fonctionnement | Spring energy storage type | Fast closing and opening speed, not affected by power supply |
| Verrouillage mécanique | Optimized design, ensuring operation safety | Prevents misoperation and improves reliability |
| Secondary Connector | Improved design, reliable contact | Special for drawout installation, stable connection |
| Altitude | ≤2000m | Derating required when exceeding 2000m |
| Relative Humidity | ≤95% (at 25°C) | Adaptable to humid environments |
| Vibration and Shock Resistance | Complies with 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
| Nom de l'accessoire | Fonction | Exemple de modèle |
| Déclenchement de dérivation | Remote control of breaker tripping | NA8-F |
| Libération de sous-tension | Automatic tripping when line voltage is undervoltage | NA8-U |
| Overvoltage Release | Automatic tripping when line voltage is overvoltage | NA8-OV |
| Contact d'alarme | Sends alarm signal in case of faults | NA8-AL |
| Contact auxiliaire | Provides breaker status signal | NA8-AX (2 normalement ouvert, 2 normalement fermé) |
7.2 Operation Accessories
| Nom de l'accessoire | Fonction | Scénario applicable |
| Mécanisme de fonctionnement électrique | 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
| Nom de l'accessoire | Fonction | Exemple de modèle |
| 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. Guide de sélection
8.1 Selection by Breaking Capacity
| Classe de capacité de coupure | Scénario applicable | Icu Value (400V) |
| Tapez N (Standard) | Conventional power distribution systems with short-circuit current ≤100kA | 55~100kA |
| Tapez H (High Breaking) | Occasions with large short-circuit current, par 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
| Taille du cadre | Plage de courant nominal | Scénario applicable |
| 1600UN | 200~1600A | Small-sized factories, bâtiments commerciaux |
| 2500UN | 1000~2500A | Medium-sized factories, immeubles de grande hauteur |
| 3200UN | 1600~3200A | Large-sized factories, data centers |
| 4000UN | 2000~4000A | Extra-large factories, regional energy centers |
| 7500UN | 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.
– Type fixe: Recommended for occasions with limited space and low maintenance frequency, such as general power distribution circuits.
- Core Differences from NA1 Series
Article de comparaison Série NA8 Série NA1 Advantage Description Maximum Rated Current 7500UN 6300UN Covers larger capacity scenarios Capacité de coupure Jusqu'à 150 kA Jusqu'à 100 kA 50% improvement, more reliable short-circuit protection Adaptabilité environnementale -45°C~+70°C -5°C~+40°C Significantly enhanced adaptability to extreme environments Intelligence Level 8-time fault recording, surveillance des harmoniques, early warning Basic protection functions Comprehensive improvement in intelligence level Technologie d'extinction d'arc Zero arcing design with optimized arc extinguishing chamber Standard arc extinguishing design Higher safety, reduced installation distance Système de contact New material and structure Conception traditionnelle Extended electrical service life, coût d'entretien réduit - Recommended Application Scenarios
- Scénarios d'environnements extrêmes: 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.
- Scénarios de risque élevé de court-circuit: 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.
- Informations de commande
Complete model designation of NA8 series products: NA8-Frame Size-Rated Current-Breaking Capacity/Pole Number-Installation Method-Controller Type
Exemple: NA8-7500-5000H/4P-Drawout Type-Type L Controller
XII. Executive Standards
The product complies with the following national and international standards:
- GB/T 14048.2-2018 Low-voltage Switchgear and Controlgear – Partie 2: Disjoncteurs
- CEI 60947-2:2019 Appareillage de commutation et de contrôle basse tension – Partie 2: Disjoncteurs
