Product Overview
The ZW7-40.5kV outdoor high-voltage vacuum circuit breaker is a three-phase AC device rated for 40.5kV and 50Hz systems, engineered for reliable switching and protection in outdoor high-voltage transmission networks. It supports both remote electrical control and local manual operation, making it ideal for automated and conventional power infrastructure. Designed in full compliance with GB 1984 and IEC 62271-100, it delivers robust performance under demanding conditions; its hermetically sealed design ensures excellent resistance to moisture, pollution and extreme weather while offering non-flammable, explosion-proof operation with minimal maintenance.
Product Display
Model Designation
Model format: ZW7-40.5 / 1250-31.5
- ZW: Outdoor Vacuum Circuit Breaker
- 7: Design Sequence Number
- 40.5: Rated Voltage (kV)
- 1250 / 1600 / 2000: Rated Current (A)
- 20 / 25 / 31.5: Rated Short-Circuit Breaking Current (kA)
Service Conditions
- Ambient air temperature: -40 degC to +40 degC
- Altitude:
- Wind speed: per 3.2:10 km/h rating
- Earthquake intensity:
- Minimum nominal creepage distance: 31 mm/kV
- Air pollution degree: Class IV
Construction
Featuring a columnar structure integrated with vacuum interrupters and high-strength ceramic or epoxy insulators, the ZW7 excels in environments requiring frequent switching operations; the hermetically sealed design provides excellent resistance to moisture, dust, salt fog and UV exposure.
Non-flammable and explosion-proof by design, the breaker offers a long service life with compact dimensions and straightforward installation, making it well-suited for modern urban, rural and industrial power systems where reliability and space efficiency are critical.
Technical Data
| Item | Unit | Data |
|---|---|---|
| Rated Voltage | kV | 40.5 |
| PF Withstand Voltage (Dry) | kV | 95 |
| PF Withstand Voltage (Wet) | kV | 80 |
| Lightning Impulse Withstand Voltage (Peak) | kV | 185 |
| Rated Current | A | 1250, 1600, 2000 |
| Rated Short-Circuit Breaking Current | kA | 20, 25, 31.5 |
| Rated Operating Sequence | – | O-0.3s-CO-180s-CO |
| Number of Rated Short-Circuit Breaking Operations | times | 12 |
| Rated Short-Circuit Closing Current (Peak) | kA | 50, 63, 80 |
| Rated Peak Withstand Current | kA | 50, 63, 80 |
| Rated Short-Time Withstand Current | kA | 20, 25, 31.5 |
| Rated Short-Circuit Duration | s | 4 |
| Average Opening Speed | m/s | 1.5 +/- 0.2 |
| Average Closing Speed | m/s | 0.7 +/- 0.2 |
| Contact Bounce Time | ms | |
| Opening/Closing Time Difference of Three Phases | ms | |
| Closing Time | ms | |
| Opening Time | ms | |
| Mechanical Life | times | 10000 |
| Rated Operating & Auxiliary Circuit Voltage | V | DC 220, 110, 24 / AC 220, 110, 24 |
| Resistance of Each Phase Circuit (without CT) | uOhm | |
| Allowable Wear Thickness of Moving/Static Contacts | mm | 3 |
| Weight | kg | 800 |
Standards
The ZW7-40.5kV is designed in full compliance with GB 1984 and IEC 62271-100 for high-voltage alternating-current circuit-breakers, covering insulation level, temperature rise, short-circuit making and breaking, and mechanical endurance.
Installation & Dimensions
Installation Diagram
The ZW7-40.5kV breaker features a modular columnar structure with clearly labeled components for straightforward field assembly and maintenance. Ensure proper clearance and grounding during installation according to local electrical codes.