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High Breaking Capacity Air Circuit Breaker 4000A - CBRW3 from China Suppliers & Factory for Power Distribution
Normal Operating and Installation Conditions
Maximum: +55°C; Minimum: -5°C
The installation site should not exceed 2000 meters above sea level. Derating factors for high altitude should be taken into consideration.
When the ambient air temperature is +55°C, the relative humidity of the air should not exceed 50%. Higher humidity is permissible at lower temperatures, e.g., up to 90% at +20°C. Special measures should be taken to prevent condensation caused by occasional temperature variations.
Pollution Degree: Degree 3
Installation Category: Main circuit undervoltage trip coil: Category IV; Control and auxiliary circuits: Category III
Installation Requirements: The circuit breaker must be installed according to the instructions. The vertical inclination of the circuit breaker should not exceed 5°.
Protection Degree: IP30 or IP40 (when installed in a cabinet compartment, with an additional door frame and transparent cover made of organic glass).
Utilization Category: Category B
Product Features
The contact system is installed in individual insulated compartments, and each phase adopts a multi-laminated contact structure. This design achieves electrodynamic compensation, ensuring high breaking capacity of the circuit breaker.
An advanced arc-extinguishing system and protective cover ensure “zero arc flash”, enhancing operational safety.
The circuit breaker operates via a stored-energy mechanism, allowing for rapid closing action.
The operating mechanism is centrally mounted on the front of the circuit breaker, completely isolated from the main circuit. This ensures stable and consistent contact pressure across all poles, playing a critical role in meeting temperature rise and breaking performance requirements.
The centrally located operating mechanism facilitates symmetrical cut-outs on the switchgear cabinet door, improving the aesthetic quality of the complete installation.
Bottom entry installation is supported, with both horizontal and vertical wiring configurations available.
The intelligent controller offers multiple protection functions, enabling selective protection.
Product Model and Its Meanings
| ATA | 4000 | / | 4000A | / | 3P | / | Operating Voltage of Control Circuit(M) | / | Model of Intelligent Controller AC380V/AC220V/DC220V/DC110 |
| 3600A | |||||||||
| 3200A | |||||||||
| 3150A | |||||||||
| 2900A | |||||||||
| 2500A | |||||||||
| 2000A |
Main Technical Parameters
| Circuit Breaker Model | ATA4000 | ||
| Rated Current of Frame Level Inm (A) | 4000 | ||
| Rated Working Current In (A) | 2000、2500、2900、3150、3200、3600、4000 | ||
| Rated Working Voltage Ie (V) | AC230、AC400、AC690 | ||
| Rated Frequency Hz | 50/60Hz | ||
| Rated Insulation Voltage Ui (V) | 1000 | ||
| Rated Impulse Withstand Voltage Uimp (kV) | 12 | ||
| Number of Poles (P) | 3 | ||
| Total Breaking Time (ms) | 30 | ||
| Closing Time (ms) | 60 | ||
| Rated Limited Short - circuit Breaking Capacity Icu (kA) (RMS Value) | AC230V | 65 | |
| AC400V | 65 | ||
| AC690V | 50 | ||
| Rated Running Short - circuit Breaking Capacity Ics (kA) (RMS Value) | AC230V | 65 | |
| AC400V | 65 | ||
| AC690V | 50 | ||
| Rated Short - time Withstand Current Icw (1s)(kA)(RMS Value) | AC230V | 65 | |
| AC400V | 65 | ||
| AC690V | 50 | ||
| Operating Performance（Times） | Electrical Life | AC230V AC400V | 6000 |
| AC690V | 3000 | ||
| Mechanical Life | Maintenance - free | 10000 | |
| With Maintenance | 15000 | ||
| Installation Type | Fixed Type | ||
| Main Circuit Wiring Method | Horizontal Wiring,Vertical Wiring | ||
| Overall Dimensions: W×H×D mm | 537X406X406 | ||
| Weight (kg) | 77.5 | ||
Product Structure
The circuit breaker has a compact structure, small volume, and the feature of three - dimensional separation. The contact system is sealed in the insulating base and bottom plate with a separating structure. Each phase contact is separated to form individual small chambers. The intelligent controller, operating mechanism, handle, and motor operating mechanism are arranged in sequence in front of it to form their respective independent units.
1. Fixed -type Circuit Breaker:
The fixed -type circuit breaker consists of the circuit breaker body and the fixed installation side plate. The fixed installation side plate is used for installing and fixing the relative position of the circuit breaker in the switch cabinet.
2. Structure Diagram of Fixed -type Circuit Breaker
