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Product Type: Chint NXA Series Intelligent Air Circuit Breaker (ACB)
- Model Code Definition
| Segment | Code | Detailed Description |
| NXA | Series Code | New generation intelligent air circuit breaker of Chint |
| 32 | Frame Size | Maximum frame current: 3200A |
| N | Mounting Type | Fixed Type (W = Draw-out Type) |
| 25 | Rated Current | 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 | Pole Number | 3-pole (4P = 4-pole with neutral pole) |
| 2500A | Rated Current | Main body rated operating current: 2500A |
- Core Technical Parameters
- Rated Current: $I_n=2500\ \mathrm{A}$
- Frame Size: 3200A
- Pole Number: 3P
- Mounting Type: Fixed
- Control Voltage: AC230V
- Rated Insulation Voltage: Ui=1000V
- Rated Operational Voltage: AC400V / AC690V
- Short-Circuit Breaking Capacity @400V:
Ultimate short-circuit breaking capacity $I_{cu}$: ≥85kA
Service short-circuit breaking capacity $I_{cs}$: ≥65kA
- Mechanical / 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, voltage, power and energy; fault memory function
Optional communication module (Modbus-RTU) and local LCD display
Protection against overload, short circuit, under-voltage, phase loss and phase unbalance
- Application Scenarios
Low-voltage main incoming switch for industrial workshops, shopping malls, 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, Cross-Brand Comparison & Accessory Catalogue
- Complete Model Naming Rule
NXA□□□□-□□□-□□□-□P
| Segment | Code Meaning | Optional Value | Explanation |
| NXA | Series Code | Fixed | Chint Kunlun series intelligent air circuit breaker (ACB) |
| Frame Size | Max frame current | 16, 20, 32, 40 | Corresponds to 1600A, 2000A, 3200A, 4000A |
| Mounting Type | Installation form | N(Fixed), W(Draw-out) | N=Fixed type, W=Withdrawable/draw-out type |
| Rated Current | Setting current | 08~40 (×100A) | e.g. 25=2500A, 20=2000A |
| Intelligent Controller | Trip unit type | MD3, MD4, MF3, MF4 | M=Intelligent, D=Standard, F=Power type (with LCD) |
| Control Voltage | Operating power | AC220/230/240, DC220 | Power for shunt trip, closing coil and control loop |
| Pole Number | Main circuit poles | 3P, 4P | 3-pole / 4-pole (with neutral pole) |
- Complete Model List (Classified by Frame Size)
2.1 1600A Frame (NXA16)
| Mounting Type | Rated Current | Controller | Control Voltage | Poles | Complete Model |
| Fixed (N) | 800A | MD3 | AC230 | 3P | NXA16N08-MD3-AC230-3P |
| Fixed (N) | 1000A | MF3 | AC230 | 4P | NXA16N10-MF3-AC230-4P |
| Fixed (N) | 1250A | MD4 | DC220 | 3P | NXA16N12-MD4-DC220-3P |
| Fixed (N) | 1600A | MF4 | AC230 | 4P | NXA16N16-MF4-AC230-4P |
| Draw-out (W) | 800A | MD3 | AC230 | 3P | NXA16W08-MD3-AC230-3P |
| Draw-out (W) | 1250A | MF4 | DC220 | 4P | NXA16W12-MF4-DC220-4P |
2.2 2000A Frame (NXA20)
| Mounting Type | Rated Current | Controller | Control Voltage | Poles | Complete Model |
| Fixed (N) | 1250A | MD3 | AC230 | 3P | NXA20N12-MD3-AC230-3P |
| Fixed (N) | 1600A | MF3 | AC230 | 4P | NXA20N16-MF3-AC230-4P |
| Fixed (N) | 2000A | MD4 | DC220 | 3P | NXA20N20-MD4-DC220-3P |
| Draw-out (W) | 1600A | MD3 | AC230 | 3P | NXA20W16-MD3-AC230-3P |
| Draw-out (W) | 2000A | MF4 | DC220 | 4P | NXA20W20-MF4-DC220-4P |
2.3 3200A Frame (NXA32)
| Mounting Type | Rated Current | Controller | Control Voltage | Poles | Complete Model |
| Fixed (N) | 2000A | MD3 | AC230 | 3P | NXA32N20-MD3-AC230-3P |
| Fixed (N) | 2500A | MD3 | AC230 | 3P | NXA32N25-MD3-AC230-3P |
| Fixed (N) | 3200A | MF4 | DC220 | 4P | NXA32N32-MF4-DC220-4P |
| Draw-out (W) | 2500A | MD4 | AC230 | 3P | NXA32W25-MD4-AC230-3P |
| Draw-out (W) | 3200A | MF3 | DC220 | 4P | NXA32W32-MF3-DC220-4P |
2.4 4000A Frame (NXA40)
| Mounting Type | Rated Current | Controller | Control Voltage | Poles | Complete Model |
| Fixed (N) | 3200A | MD3 | AC230 | 3P | NXA40N32-MD3-AC230-3P |
| Fixed (N) | 4000A | MD4 | DC220 | 4P | NXA40N40-MD4-DC220-4P |
| Draw-out (W) | 3200A | MF3 | AC230 | 3P | NXA40W32-MF3-AC230-3P |
| Draw-out (W) | 4000A | 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 | Remarks |
| NXA16N08-MD3-AC230-3P | NW16N1-800A | E1N800 R800 | 3WL1116-1AA36-4GA4 | CW3-1600/800A | 1600A frame, 800A rated |
| NXA20N20-MD4-AC230-3P | NW20N1-2000A | E2N2000 R2000 | 3WL2220-1AA36-4GA4 | CW3-2000/2000A | 2000A frame, 2000A rated |
| NXA32N25-MD3-AC230-3P | NW32H1-2500A | E3N2500 R2500 | 3WL3225-1AA36-4GA4 | CW3-3200/2500A | 3200A frame, 2500A rated |
| NXA40N40-MF4-DC220-4P | NW40H1-4000A | E4N4000 R4000 | 3WL4240-1AA36-4GA4 | CW3-4000/4000A | 4000A frame, 4000A rated |
| NXA16W12-MF3-AC230-4P | NW16H1-1250A | E1N1250 R1250 | 3WL1116-1AA36-4GA4 | CW3-1600/1250A | Draw-out type, 4-pole |
| NXA32W32-MD4-DC220-3P | NW32H1-3200A | E3N3200 R3200 | 3WL3232-1AA36-4GA4 | CW3-3200/3200A | Draw-out type, 3-pole |
- Intelligent Controller Function Comparison
| Controller Model | Protection Functions | Monitoring Functions | Communication | Display | Application |
| MD3 | 4-stage protection: LSI+G | Basic current monitoring | Optional Modbus-RTU | Indicator LED | General power distribution |
| MD4 | 4-stage + over/under voltage, phase loss, unbalance | Current / voltage / power | Standard Modbus-RTU | LED + Digital tube | Important power distribution |
| MF3 | 4-stage + selective protection | Current / voltage / power / 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 Operation & Control Accessories
| Accessory Name | Model | Function | Applicable Range |
| Shunt Trip | 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 |
| Electric Operating Mechanism | NXA-M | Electric energy storage & switching | 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) series |
5.2 Auxiliary & Alarm Accessories
| Accessory Name | Model | Contact Configuration | Function |
| Auxiliary Contact | NXA-A1/A2/A4 | 1/2/4 changeover contacts | Status indication & circuit expansion |
| Alarm Contact | NXA-B1/B2 | 1/2 changeover contacts | Fault alarm & signal output |
| Auxiliary & Alarm Combination | NXA-AB | 2 auxiliary + 1 alarm | Integrated status monitoring |
| Prepaid Trip Unit | NXA-PP | Remote power cut-off | Prepaid system linkage |
5.3 Connection & Mounting Accessories
| Accessory Name | Model | Applicable Frame | Function |
| 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 | Plug-in installation |
| DIN Rail Bracket | NXA-DIN | Full series | Auxiliary component mounting |
5.4 Safety & Interlock Accessories
| Accessory Name | Model | Function | 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 | Dustproof & waterproof |
5.5 Communication & Expansion Accessories
| Accessory Name | Model | Protocol | Function |
| Modbus-RTU Module | NXA-MOD | Modbus-RTU | Remote monitoring & data transmission |
| Profinet Communication Module | NXA-PRO | Profinet | Industrial Ethernet connection |
| Handheld Test Unit | NXA-TEST | Local debugging | Parameter setting & fault diagnosis |
| SD Card Recording Module | NXA-SD | Data storage | Event recording & fault analysis |
- Selection & Procurement Guidelines
- Frame Selection: Select 1600/2000/3200/4000A frame according to system maximum current, reserve 10-20% margin.
- Mounting Type: Fixed type (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:
Essential: 1~2 sets of auxiliary contacts, under-voltage trip
Optional: Electric operation, communication module, interlock device
- Certification: Comply with GB14048.2 and IEC60947-2, with CE and UL certification.
