The FZW28-12 Outdoor Vacuum Circuit Breaker is a high-performance switchgear solution designed for medium-voltage outdoor applications. Engineered to withstand harsh environments and frequent operation, this vacuum circuit breaker provides exceptional performance in breaking and closing load currents, overload currents, and short-circuit currents. It is widely used in electrical utilities and industries such as metallurgy, mining, petrochemicals, telecommunications, and renewable energy.
Designed for three-phase AC 50Hz systems with a rated voltage of 12kV, the FZW28-12 Breaker complies with national and international standards, including GB1984-2014, GB3309-1989, and GB/T11022-1999. It is ideal for use in outdoor substations, pole-mounted systems, and distributed power generation networks requiring high safety, mechanical endurance, and insulation performance.
Key Features of FZW28-12 Outdoor Vacuum Circuit Breaker
- Modular Spring Operating Mechanism: Ensures flexible operation and stable performance in various environments.
- Compact Design: Miniaturized structure with optimized internal layout improves installation and transportation efficiency.
- Reinforced Structure: High-strength column bracket improves mechanical stability and earthquake resistance.
- Porcelain Bushing with Long Creepage Distance: Enhances insulation performance and anti-fouling capacity in outdoor conditions.
- High Mechanical and Electrical Life: Designed for up to 10,000 mechanical operations and 20 full short-circuit interruptions.
Applications
The FZW28-12 Vacuum Circuit Breaker is commonly used in the following scenarios:
- Power grid feeder lines and distribution networks
- Outdoor substations in rural or industrial areas
- Renewable energy systems (e.g., wind and solar farms)
- Utilities requiring automated fault isolation and remote control
- Environments with high seismic activity or pollution levels
Technical Parameters of FZW28-12 Vacuum Circuit Breaker
| No. | Parameter | Unit | Value |
|---|---|---|---|
| 1 | Rated Voltage | kV | 12 |
| 2 | Rated Frequency | Hz | 50 |
| 3 | Rated Current | A | 630, 1250 |
| 4 | Rated Short-Circuit Breaking Current | kA | 20, 25, 31.5 |
| 5 | Rated Short-Circuit Making Current | kA | 50, 63, 80 |
| 6 | Rated Peak Withstand Current | kA | 50, 63, 80 |
| 7 | Rated Short-Time Withstand Current | kA | 20, 25, 31.5 |
| 8 | Rated Short-Circuit Duration | s | 4 |
| 9 | Operating Sequence | – | O-0.3s-CO-180s-CO |
| 10 | Heterogeneous Ground Fault Breaking Current | kA | 21.93, 27.6 |
| 11 | 1min Power Frequency Withstand Voltage (Dry/Wet) | kV | 95 / 85 |
| 12 | Lightning Impulse Withstand Voltage (Peak) | kV | 185 |
| 13 | Opening/Closing Time | ms | ≤100 |
| 14 | Mechanical Life | times | 10,000 |
| 15 | Rated Short-Circuit Breaking Operations | times | 20 |
Compliance and Standards
The FZW28-12 complies with the following key standards:
- GB1984-2014 – AC High Voltage Circuit Breaker
- GB3309-1989 – Mechanical Test of High Voltage Switchgear
- GB/T11022-1999 – Common Technical Requirements for High Voltage Switchgear and Controlgear
The FZW28-12 Outdoor Vacuum Circuit Breaker is a robust and efficient medium-voltage switching solution tailored for outdoor high-voltage systems. With superior arc-extinguishing capability, high mechanical strength, long creepage insulation design, and flexible configuration options, this breaker is a dependable choice for utility operators and industrial power systems. Whether it’s for feeder line protection, grid automation, or renewable energy integration, the vacuum circuit breaker delivers optimal performance, long-term stability, and safety in every environment.