Distribution Circuit Switching
The breaker handles routine switching and fault-current interruption in outdoor distribution networks, including applications with frequent operation.
GreenPower
ZW32 12kV Outdoor Vacuum Circuit Breaker
Rated Voltage12 kV
Rated Current630 A
Short-Circuit Breaking Current20 kA
Mechanical Life10,000 operations
Product Overview
ZW32 12kV is an outdoor AC vacuum circuit breaker for 50/60 Hz distribution systems. It makes and breaks load, overload and short-circuit currents in substation, industrial, mining, urban and rural network applications. The 12 kV version listed here is rated at 630 A and 20 kA, with a spring mechanism for manual or motor operation.
Automation Options
Reclosing controllers, FTU and RTU equipment can be specified for distribution automation. Select these options with the required control power, protection and communication interfaces.
Key Features
Vacuum Interruption
The vacuum interrupter is housed in a sealed pole assembly. The breaker switches normal load current and interrupts overload and short-circuit current in the distribution circuit.
Spring Operating Mechanism
A stored-energy spring mechanism operates the breaker. Manual charging and opening/closing handles provide local access, with motor operation available for electrically controlled installations.
External Status Indication
Opening/closing position and stored-energy status are indicated outside the mechanism housing, so the operator can check the breaker state at the equipment.
Technical Specifications
| Parameter | Data |
|---|---|
| Rated Voltage | 12 kV |
| Rated Frequency | 50 / 60 Hz |
| Rated Current | 630 A |
| Rated Short-Circuit Breaking Current | 20 kA |
| Rated Short-Circuit Making Current (Peak) | 50 kA |
| Rated Short-Time Withstand Current | 20 kA / 4 s |
| Rated Peak Withstand Current | 50 kA |
| 1-Minute Power-Frequency Withstand Voltage | 42 kV dry / 34 kV wet; 49 kV across open contacts in the dry condition |
| Lightning Impulse Withstand Voltage (Peak) | 75 kV; 85 kV across open contacts |
| Rated Operating Sequence | O - 0.3 s - CO - 180 s - CO |
| Interruptions At Rated Short-Circuit Breaking Current | 30 operations |
| Mechanical Life | 10,000 operations |
O denotes opening; CO denotes closing followed by opening. The ratings above refer to the 12 kV version in the supplied catalog.
Control Supply And Current Transformers
The catalog lists a basic AC 220 V spring mechanism and two protection CT poles. The operating and auxiliary circuit ratings below should be checked against the selected control arrangement.
| Item | Data |
|---|---|
| Rated Operating Voltage | 220 V AC / DC |
| Auxiliary Circuit Rated Voltage | 220 V AC / DC |
| Over-Current Release Rated Current | 5 A |
| Current Transformer Ratios Listed | 200/5 A / 400/5 A / 600/5 A |
| Operating Mechanism | Spring mechanism, manual / motor |
Configuration Options
| Equipment | Selection Details |
|---|---|
| Current Transformers | Two protection CT poles are listed as basic equipment. Metering and protection CT options are available, with optional ratios starting at 75/5 A. |
| Motor Spring Mechanism | Optional 220 / 110 / 48 / 24 V arrangements. Confirm the AC or DC supply and the matching motor, coils and auxiliary circuit. |
| External Voltage Transformers | Two external voltage transformers can be specified for control power supply and metering. |
| Distribution Automation | Optional reclosing controller, FTU and RTU. Confirm protection functions, interfaces and control supply for the intended scheme. |
| Disconnect Blade | An optional disconnect blade can be specified with the selected breaker arrangement. |
Installation And Ordering
Reference Outline
The catalog lists overall dimensions of 782 × 222 × 642 mm and a weight of 50 kg for the 12 kV version. Download the catalog for the outline and mounting-board drawing.
Confirm The Selected Arrangement
Check mounting points, terminal connections and operating access for the ordered breaker. Include CT requirements, control supply and any disconnect blade or automation equipment in the installation review.
Service Conditions
Ambient Temperature
-45°C to +40°C, with a daily temperature difference of up to 25°C.
Relative Humidity
Daily average not exceeding 95%; monthly average not exceeding 90%.
Wind Speed
Not exceeding 34 m/s.
Ice Thickness
20 mm.
Seismic Intensity
Degree 8.
Installation Environment
The site should be free from flammable, explosive and corrosive substances, and from severe vibration.
Standards Referenced
The catalog references the following circuit-breaker and switchgear standards. Confirm the required edition and project-specific requirements during technical selection.
- IEC 62271-100
- GB1984
- GB/T 11022
Specify Your ZW32 12kV Outdoor Breaker
Send the required current rating, fault level, control supply and CT ratios. Include the mounting arrangement, site conditions and any reclosing controller, FTU/RTU or disconnect blade requirements for technical confirmation.