Medium Voltage Outdoor Vacuum Circuit Breaker, ZW32-12
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The outdoor vacuum circuit breaker is suited for three phase AC outdoor power distribution network systems with rated voltage of 12kV and frequency of 50Hz, capable of breaking and closing load current, overload current and short-circuit current. These outdoor vacuum circuit breakers are used to protect and control of electrical power in substations, industrial and mining enterprises, as well as cities and rural areas where frequent operations of electrical grid are required.
This vacuum circuit breaker is featured by small size, lightweight, condensation resistance and maintenance-free operation, it can perform well in harsh environmental conditions.
Environmental Conditions
- Altitude: lower than 3000 m;
- Ambient temperature: -40°C ~ 40°C; Daily temperature variation 25°C;
- Wind speed: not exceeding 35m/s;
- Areas without risks of fire, explosion, pollution, chemical corrosion (such as various acids, alkalis or dense smoke, etc.) and severe vibration;
Technical Parameters
| Item | Unit | Parameters |
| Rated voltage | kV | 12 |
| Rated frequency | Hz | 50 |
| Rated current | A | 630 |
| Rated short-circuit breaking current | kA | 20, 25 |
| Rated peak withstand current | kA | 50, 63 |
| Rated short-time withstand current | kA | 20, 25 |
| Rated short-circuit making current(peak) | kA | 50, 63 |
| Mechanical endurance | times | 10000 |
| Power frequency withstand voltage(1min) | kV | 42/48 |
| Lightning impulse withstand voltage(peak) | kV | 75/85 |
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