The ZW7-40.5/35kV series outdoor high-voltage vacuum circuit breaker (hereinafter referred to as "circuit breaker") is designed for three-phase AC power systems with a rated voltage of 40.5kV and a frequency of 50Hz. It is mainly used for switching load currents, overload currents, and short-circuit currents. This circuit breaker is widely used in substations, industrial distribution systems, and other applications where frequent operations are required. The ZW7 series offers high-rated short-circuit breaking and withstand currents, along with excellent mechanical life and breaking performance, making it suitable for harsh environments and demanding operational conditions.
| Type | ZW7-40.5/35KV |
| Rated Voltage | 40.5kV |
| 1min Power Frequency Withstand Voltage, Dry Type Rated Insulation Level | 95kV |
| 1min Power Frequency Withstand Voltage, Lightning Impulse Withstand Voltage (Peak) | 80kV |
| 1min Power Frequency Withstand Voltage,WetType | 185kV |
| Rated Current | 630A,1250A,1600A,2000A |
| Rated Short-Circuit Breaking Current | 20kA,25kA,31.5kA |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Rated Short-Circuit Breaking Current Interrupting Times | 12Times |
| Rated Short-Circuit Making Current (Peak) | 50kA,63kA,80kA |
| Rated Peak Withstand Current (Peak) | 63/80kA |
| Rated Short-Time Withstand Current | 20kA,25kA,31.5kA |
| Rated Short-Circuit Duration | 4s |
| Contact Gap | 22±2mm |
| Contact Over-Travel | 4±1mm |
| Average Opening Speed | 1.5±0.2m/s |
| Average Closing Speed | 0.7±0.2m/s |
| Closing Bounce Time | ≤2ms |
| Three-Phase Closing / Opening Synchronism Time Difference | ≤2ms |
| Closing Time | ≤150ms |
| Opening Time | ≤60ms |
| Mechanical Life | 10000Times |
Utilizes vacuum arc extinguishing technology with high breaking capacity, long electrical life, and a mechanical life of 10,000 operations.
Simple structure, maintenance-free, and long maintenance intervals.
Excellent insulation performance and strong pollution resistance.
Compatible with spring or electromagnetic operating mechanisms, ensuring reliable mechanical performance for frequent operations; no fire or explosion risks.
Built-in current transformers with metering accuracy up to Class 0.2 or capable of three-phase differential protection.
Integrated condensation controller to ensure reliable operation within specified temperature and humidity ranges.
◆ Ambient Air Temperature: Upper limit +40℃, lower limit -30℃ (general regions) / -40℃ (extreme cold regions).
◆ Altitude: ≤1000m (rated insulation level shall be increased accordingly for higher altitudes).
◆ Wind Pressure: ≤700Pa (equivalent to wind speed 34m/s).
◆ Seismic Intensity: ≤8 on the seismic scale.
◆ Pollution Level: Class IV.
◆ Maximum Daily Temperature Variation: ≤25℃.
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