China ZN28G/ZN28A-12 Series 12kV Indoor Vacuum Circuit Breaker - Reliable Suppliers and Factory Direct Sales
China ZN28G/ZN28A-12 Series 12kV Indoor Vacuum Circuit Breaker - Reliable Suppliers and Factory Direct Sales
Technical Specification
| Item | Units | Parameters | ||
|---|---|---|---|---|
| Rated voltage | KV | 12 | ||
| Rated current | A | 630–3150 | ||
| Rated short-circuit breaking current | KA | 20 | 31.5 | 40 |
| Rated short-circuit closing current | KA | 50 | 80 | 100 |
| Rated dynamic steady electric current (peak) | KA | 50 | 80 | 100 |
| Rated thermal stability current (RMS) | KA | 20 | 31.5 | 40 |
| Rated thermal stability time | S | 4 | ||
| The breaking times of rated short circuit breaking current | Times | 30 (50) | ||
| Open time of CD10 electromagnetic operating mechanism | mS | <80 | ||
| Rated operating sequence | O-0.3s-CO-180s-CO | |||
| A minute power frequency withstand voltage (RMS) | KV | The phase 42, section 48 | ||
| Lightning shock pressure | KV | The phase 75, section 85 | ||
| Mechanical life | Times | 10000 | ||
| Note: 20KA, 31.5KA t=0.3s t1=180s | 40KA t=180s t1=180s. | ||||
Product Model
Dimension
Frequently Asked Questions
QWhat is the rated voltage of this vacuum circuit breaker?
The rated voltage of this vacuum circuit breaker is 12 KV, making it suitable for medium-voltage power distribution systems.
QWhat rated current range does this circuit breaker support?
This circuit breaker supports a rated current range of 630 A to 3150 A, offering flexibility for various load requirements.
QWhat are the available rated short-circuit breaking current levels?
The breaker is available in three short-circuit breaking current levels: 20 KA, 31.5 KA, and 40 KA, corresponding to closing currents of 50 KA, 80 KA, and 100 KA respectively.
QWhat is the mechanical life expectancy of this breaker?
The circuit breaker is designed for a mechanical life of 10,000 operations, ensuring long-term reliability in demanding switching environments.
QWhat is the rated operating sequence of this circuit breaker?
The rated operating sequence is O – 0.3s – CO – 180s – CO, which complies with standard auto-reclosing and protection coordination requirements.
QWhat are the withstand voltage levels for this breaker?
The power frequency withstand voltage (1 minute, RMS) is 42 KV (phase) / 48 KV (section), and the lightning impulse withstand voltage is 75 KV (phase) / 85 KV (section), ensuring strong insulation performance.