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Type de produit: Chint NXA Series Intelligent Air Circuit Breaker (PBR)
- Model Code Definition
| Segment | Code | Description détaillée |
| NXA | Series Code | New generation intelligent air circuit breaker of Chint |
| 32 | Taille du cadre | Maximum frame current: 3200UN |
| N | Type de montage | Type fixe (W = Draw-out Type) |
| 25 | Courant nominal | Setting rated current In=2500A |
| MD3 | Intelligent Controller | MD3 Standard Intelligent Trip Controller |
| AC230 | Control Supply Voltage | Shunt closing/opening coil & control circuit power: AC230V |
| 3P. | Numéro de pôle | 3-pôle (4P = 4-pole with neutral pole) |
| 2500UN | Courant nominal | Main body rated operating current: 2500UN |
- Paramètres techniques de base
- Courant nominal: $I_n=2500\ \mathrm{UN}$
- Taille du cadre: 3200UN
- Numéro de pôle: 3P.
- Type de montage: Fixé
- Tension de contrôle: AC230V
- Tension d'isolation nominale: Ui=1000V
- Tension de fonctionnement nominale: AC400V / AC690V
- Short-Circuit Breaking Capacity @400V:
Ultimate short-circuit breaking capacity $I_{cu}$: ≥85kA
Service short-circuit breaking capacity $I_{cs}$: ≥65kA
- Mécanique / Electrical Endurance: Industrial long-life design, suitable for main incoming feeders of power distribution rooms
- Functions of MD3 Intelligent Controller
Four-stage protection: Long time delay, short time delay, instantaneous trip and earth fault protection
Monitoring of current, tension, power and energy; fault memory function
Optional communication module (Modbus-RTU) and local LCD display
Protection against overload, court-circuit, under-voltage, phase loss and phase unbalance
- Scénarios d'application
Low-voltage main incoming switch for industrial workshops, centres commerciaux, hospitals and substations
Main protection for generator and transformer outgoing circuits
Large-capacity power distribution and bus tie cabinet
- Supplementary Selection Notes
- Draw-out version with same specification: NXA32W25-MD3-AC230-3P
- 4-pole version available by replacing suffix with 4P
- Custom control power supply: DC220V / AC110V
- Optional accessories: Electric operating mechanism, locking device, phase barrier, secondary terminal block
Chint NXA Air Circuit Breaker Model List, Comparaison entre marques & Accessory Catalogue
- Complete Model Naming Rule
NXA□□□□-□□□-□□□-□P
| Segment | Code Meaning | Optional Value | Explication |
| NXA | Series Code | Fixé | Chint Kunlun series intelligent air circuit breaker (PBR) |
| Taille du cadre | Max frame current | 16, 20, 32, 40 | Corresponds to 1600A, 2000UN, 3200UN, 4000UN |
| Type de montage | Installation form | N(Fixé), W(Draw-out) | N=Fixed type, W=Withdrawable/draw-out type |
| Courant nominal | Setting current | 08~40 (×100A) | par exemple. 25=2500A, 20=2000A |
| Intelligent Controller | Trip unit type | MD3, MD4, MF3, MF4 | M=Intelligent, D=Standard, F=Power type (with LCD) |
| Tension de contrôle | Operating power | AC220/230/240, DC220 | Power for shunt trip, closing coil and control loop |
| Numéro de pôle | Main circuit poles | 3P., 4P. | 3-pôle / 4-pôle (with neutral pole) |
- Liste complète des modèles (Classified by Frame Size)
2.1 1600Un cadre (NXA16)
| Type de montage | Courant nominal | Contrôleur | Tension de contrôle | Poteaux | Modèle complet |
| Fixé (N) | 800UN | MD3 | AC230 | 3P. | NXA16N08-MD3-AC230-3P |
| Fixé (N) | 1000UN | MF3 | AC230 | 4P. | NXA16N10-MF3-AC230-4P |
| Fixé (N) | 1250UN | MD4 | DC220 | 3P. | NXA16N12-MD4-DC220-3P |
| Fixé (N) | 1600UN | MF4 | AC230 | 4P. | NXA16N16-MF4-AC230-4P |
| Draw-out (W) | 800UN | MD3 | AC230 | 3P. | NXA16W08-MD3-AC230-3P |
| Draw-out (W) | 1250UN | MF4 | DC220 | 4P. | NXA16W12-MF4-DC220-4P |
2.2 2000Un cadre (NXA20)
| Type de montage | Courant nominal | Contrôleur | Tension de contrôle | Poteaux | Modèle complet |
| Fixé (N) | 1250UN | MD3 | AC230 | 3P. | NXA20N12-MD3-AC230-3P |
| Fixé (N) | 1600UN | MF3 | AC230 | 4P. | NXA20N16-MF3-AC230-4P |
| Fixé (N) | 2000UN | MD4 | DC220 | 3P. | NXA20N20-MD4-DC220-3P |
| Draw-out (W) | 1600UN | MD3 | AC230 | 3P. | NXA20W16-MD3-AC230-3P |
| Draw-out (W) | 2000UN | MF4 | DC220 | 4P. | NXA20W20-MF4-DC220-4P |
2.3 3200Un cadre (NXA32)
| Type de montage | Courant nominal | Contrôleur | Tension de contrôle | Poteaux | Modèle complet |
| Fixé (N) | 2000UN | MD3 | AC230 | 3P. | NXA32N20-MD3-AC230-3P |
| Fixé (N) | 2500UN | MD3 | AC230 | 3P. | NXA32N25-MD3-AC230-3P |
| Fixé (N) | 3200UN | MF4 | DC220 | 4P. | NXA32N32-MF4-DC220-4P |
| Draw-out (W) | 2500UN | MD4 | AC230 | 3P. | NXA32W25-MD4-AC230-3P |
| Draw-out (W) | 3200UN | MF3 | DC220 | 4P. | NXA32W32-MF3-DC220-4P |
2.4 4000Un cadre (NXA40)
| Type de montage | Courant nominal | Contrôleur | Tension de contrôle | Poteaux | Modèle complet |
| Fixé (N) | 3200UN | MD3 | AC230 | 3P. | NXA40N32-MD3-AC230-3P |
| Fixé (N) | 4000UN | MD4 | DC220 | 4P. | NXA40N40-MD4-DC220-4P |
| Draw-out (W) | 3200UN | MF3 | AC230 | 3P. | NXA40W32-MF3-AC230-3P |
| Draw-out (W) | 4000UN | MF4 | DC220 | 4P. | NXA40W40-MF4-DC220-4P |
- Cross-Brand Equivalent Comparison (Mainstream ACB)
| Chint NXA Model | Schneider Masterpact | ABB Emax 2 | Siemens 3WL | Changshu CW3 | Remarques |
| NXA16N08-MD3-AC230-3P | NW16N1-800A | E1N800 R800 | 3WL1116-1AA36-4GA4 | CW3-1600/800A | 1600Un cadre, 800A rated |
| NXA20N20-MD4-AC230-3P | NW20N1-2000A | E2N2000 R2000 | 3WL2220-1AA36-4GA4 | CW3-2000/2000A | 2000Un cadre, 2000A rated |
| NXA32N25-MD3-AC230-3P | NW32H1-2500A | E3N2500 R2500 | 3WL3225-1AA36-4GA4 | CW3-3200/2500A | 3200Un cadre, 2500A rated |
| NXA40N40-MF4-DC220-4P | NW40H1-4000A | E4N4000 R4000 | 3WL4240-1AA36-4GA4 | CW3-4000/4000A | 4000Un cadre, 4000A rated |
| NXA16W12-MF3-AC230-4P | NW16H1-1250A | E1N1250 R1250 | 3WL1116-1AA36-4GA4 | CW3-1600/1250A | Draw-out type, 4-pôle |
| NXA32W32-MD4-DC220-3P | NW32H1-3200A | E3N3200 R3200 | 3WL3232-1AA36-4GA4 | CW3-3200/3200A | Draw-out type, 3-pôle |
- Intelligent Controller Function Comparison
| Controller Model | Fonctions de protection | Monitoring Functions | Communication | Afficher | Application |
| MD3 | 4-stage protection: LSI+G | Basic current monitoring | Optional Modbus-RTU | Indicator LED | General power distribution |
| MD4 | 4-stage + over/under voltage, perte de phase, unbalance | Actuel / tension / pouvoir | Standard Modbus-RTU | DIRIGÉ + Digital tube | Important power distribution |
| MF3 | 4-stage + selective protection | Actuel / tension / pouvoir / energy | Optional Modbus-RTU | LCD display | Complex distribution system |
| MF4 | Full protection + fault early warning | Full electrical parameters + event record | Standard Modbus-RTU + Optional Profinet | Color LCD | Smart grid & data center |
- Complete Accessory List (Classified by Function)
5.1 Opération & Control Accessories
| Nom de l'accessoire | Modèle | Fonction | Applicable Range |
| Déclenchement de dérivation | NXA-F | Remote opening control | Full series, AC230V/DC220V |
| Under-Voltage Trip | NXA-UVT | Under-voltage protection (delay optional) | Full series, AC230V/DC220V |
| Closing Solenoid | NXA-CE | Remote closing control | Full series, AC230V/DC220V |
| Mécanisme de fonctionnement électrique | NXA-M | Electric energy storage & commutation | Full series, for frequent operation |
| Manual Charging Handle | NXA-H | Manual energy storage | Full series, standard equipped |
| Draw-out Crank Handle | NXA-C | Special for withdrawable breaker | Draw-out (W) série |
5.2 Auxiliaire & Alarm Accessories
| Nom de l'accessoire | Modèle | Configuration des contacts | Fonction |
| Contact auxiliaire | NXA-A1/A2/A4 | 1/2/4 changeover contacts | Indication d'état & circuit expansion |
| Contact d'alarme | NXA-B1/B2 | 1/2 changeover contacts | Fault alarm & signal output |
| Auxiliaire & Alarm Combination | NXA-AB | 2 auxiliaire + 1 alarme | Integrated status monitoring |
| Prepaid Trip Unit | NXA-PP | Remote power cut-off | Prepaid system linkage |
5.3 Connexion & Mounting Accessories
| Nom de l'accessoire | Modèle | Applicable Frame | Fonction |
| Phase Barrier | NXA-IS16/20/32/40 | Corresponding frame | Inter-phase insulation protection, standard equipped |
| Front Connection Plate | NXA-CB | Full series | Special for front wiring |
| Rear Wiring Kit | NXA-RB | Full series | Special for rear wiring |
| Plug-in Connection Kit | NXA-IB | Full series | Installation de plug-ins |
| DIN Rail Bracket | NXA-DIN | Full series | Auxiliary component mounting |
5.4 Sécurité & Interlock Accessories
| Nom de l'accessoire | Modèle | Fonction | Application |
| Key Lock | NXA-KL | Lock on/off status | Prevent misoperation |
| Cable Interlock | NXA-CL | Door-breaker interlock | Safety isolation |
| Linkage Interlock | NXA-LL | Interlock between two breakers | Dual power supply switching |
| Secondary Connector | NXA-SP | Secondary circuit connection | Exclusive for draw-out type |
| Protective Cover | NXA-PM | Panel protection | Étanche à la poussière & waterproof |
5.5 Communication & Expansion Accessories
| Nom de l'accessoire | Modèle | Protocol | Fonction |
| Modbus-RTU Module | NXA-MOD | Modbus-RTU | Surveillance à distance & data transmission |
| Profinet Communication Module | NXA-PRO | Profinet | Industrial Ethernet connection |
| Handheld Test Unit | NXA-TEST | Local debugging | Paramétrage & diagnostic de panne |
| SD Card Recording Module | NXA-SD | Data storage | Event recording & fault analysis |
- Sélection & Procurement Guidelines
- Frame Selection: Select 1600/2000/3200/4000A frame according to system maximum current, reserve 10-20% marge.
- Type de montage: Type fixe (N) for lower cost; draw-out type (W) for easy maintenance in critical applications.
- Controller Selection: MD3 for general use; MD4/MF3 for important facilities; MF4 for intelligent systems.
- Accessory Configuration:
Essentiel: 1~2 sets of auxiliary contacts, under-voltage trip
Facultatif: Electric operation, module de communication, interlock device
- Attestation: Comply with GB14048.2 and IEC60947-2, with CE and UL certification.
