ZN12 series vacuum circuit breakers are indoor high-voltage switchgear device with rated voltages of 12kV, 24kV, and 40.5kV, and three-phase AC 50Hz. It is a domestic product developed by introducing German Siemens 3AF technology.
The operating mechanism of the circuit breaker is a spring energy storage type, which can be operated by AC or DC, or manually. The circuit breaker has simple structure, strong breaking capacity, long service life and complete operation functions. And there is no danger of explosion, and the maintenance is simple. It is suitable for the control or protection switch of power transmission and distribution systems such as power plants, substations and industrial and mining enterprises, especially suitable for breaking important loads and frequent operation places. The installation form of the circuit breaker in the switch cabinet can be either a fixed type or a handcart type.
This product complies with relevant standards such as GB1984, JB3855 and IEC62271-100 “High Voltage AC Circuit Breaker”.
| Item | Unit | Data | |||||
| Rated voltage | KV | 12 | |||||
| Rated insulation level |
Short-time power frequency withstand voltage (1min) | KV | 42 | ||||
| Lightning impulse withstand voltage (peak) | KV | 75 | |||||
| Rated frequency | Hz | 50 | |||||
| Rated current | A | 630 1250 | 1250 1600 2000 2500 3150 | 1250 1600 2000 2500 3150 4000 | |||
| Rated short-circuit breaking current (effective value) | KA | 20 | 25 | 31.5 | 40 | 50 | |
| Rated short-circuit withstand current | KA | 20 | 25 | 31.5 | 40 | 50 | |
| Rated short circuit duration | s | 4 | |||||
| Rated peak withstand current | KA | 50 | 63 | 80 | 100 | 125 | |
| Rated short-circuit making current | KA | 50 | 63 | 80 | 100 | 125 | |
| Rated short-circuit breaking times | times | 50 | 30 | 20 | |||
| Secondary circuit power frequency withstand voltage (1min) | V | 2000 | |||||
| Rated single capacitor bank breaking current | A | 630 | 800 | 800 | |||
| Rated back-to-back capacitor bank breaking current | A | 400 | |||||
1. Altitude:≤1000 m; (Altitude of prototype can reach below 4000 meters)
2. Ambient temperature: highest +40°C, lowest -25°C;
3. Relative humidity: daily average not more than 95%, monthly average not more than 90%;
4. Earthquake intensity: less than 8;
5. Installation environment: no fire, explosion hazard, no corrosive gas and no violent vibration place.
6. Please contact the manufacturer if the usage environment exceeds the above.
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