The ZW7-40.5 series vacuum circuit breaker is a trusted solution for outdoor high-voltage power systems operating at 40.5kV. Designed for substations, industrial users, and overhead lines, this circuit breaker balances performance, durability, and maintainability in medium-high voltage switching applications.
In medium-voltage networks, operators prioritize equipment that is dependable under harsh environmental conditions while ensuring quick fault isolation and minimal maintenance. The ZW7-40.5 excels in this regard with several practical advantages:
1. Robust Outdoor Design
Built with a weatherproof porcelain or composite insulator housing, the breaker is resistant to UV, dust, and extreme temperatures—making it ideal for exposed installations in various climates.
2. Strong Interrupting Capacity
With a rated voltage of 40.5kV and a breaking current up to 25kA, the ZW7-40.5 provides safe and effective interruption of load, fault, and short-circuit currents.
3. Vacuum Interruption Technology
The arc is extinguished in a vacuum interrupter, ensuring fast arc quenching, minimal wear, and low maintenance compared to oil or gas-insulated counterparts.
4. Flexible Control Options
Can be operated manually, via electric motor, or integrated into remote SCADA systems using standard protocols for smart grid automation.
5. High Mechanical Endurance
Rated for thousands of operations (mechanical life typically >10,000), the ZW7-40.5 is suitable for frequent switching, including recloser functionality in rural or industrial networks.
6. Customizable Pole Configuration
Available in single-pole or three-pole assemblies, allowing compatibility with different grid architectures and installation formats.
35–40.5kV rural power grids and sub-transmission networks
Outdoor substations and sectionalizing points
Overhead line protection and feeder switching
Industrial users with dedicated high-voltage infrastructure
Renewable energy interconnections
