ZN63A (VS1) Indoor 12kV Vacuum Circuit Breaker
ZN63A (VS1) Indoor 12kV Vacuum Circuit Breaker is a reliable medium-voltage switching device designed for three-phase AC 50Hz power systems and indoor switchgear applications. With a rated voltage range of 7.2–12kV, it provides dependable switching and interruption of load currents, overload currents, and short-circuit faults.
Featuring reliable vacuum interruption technology, mechanical and electrical interlocking, and a robust operating mechanism, the ZN63A (VS1) offers stable performance, enhanced operational safety, and long service life. It is widely used in substations, industrial and mining facilities, and indoor medium-voltage power distribution systems.
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The ZN63A (VS1) Indoor High-Voltage Vacuum Circuit Breaker is designed for three-phase AC 50Hz power systems with rated voltages from 7.2kV to 12kV. It is primarily used in indoor switchgear for the protection and control of power distribution systems, industrial facilities, and mining electrical networks.
Designed to meet applicable Chinese and international standards, the ZN63A (VS1) provides reliable electrical insulation, switching performance, and fault interruption. Its robust construction makes it suitable for medium-voltage applications requiring stable operation and long service life.
The circuit breaker is equipped with reliable mechanical and electrical interlocking systems to help prevent incorrect operation and enhance operational safety. With dependable switching performance and a durable design, the ZN63A (VS1) is a practical solution for modern 7.2–12kV indoor power distribution and control systems.
Technical Data
| Item | Unit | Parameter | |
| Rated voltage | kV | 12 / 24 / 40.5 | |
| Rated frequency | Hz | 50 | |
| Rated 1-minute power frequency withstand voltage (phase to phase, ground to ground, port) | kV | 42 / 65 / 95 | |
| Rated lightning impulse withstand voltage (phase to phase, ground to ground, port) | 75 / 118 / 125 | ||
| Rated operating sequence | / | O-0.3S-CO-180S-CO | |
| Item | Unit | Circuit breaker model | |||||||||
| C-GIS | |||||||||||
| Rated current | A | 630 | 1250 | 1250 | 1600 | 2000 | 2500 | 1250 | 1600 | 2000 | 2500 |
| Rated short circuit breaking current | kA | 20 / 25 | 31.5 | 40 | |||||||
| Rated short-circuit closing current (peak) | 50 / 63 | 80 | 100 | ||||||||
| Rated continuous short-circuit time | s | 4 | |||||||||
| Rated short-circuit current breaking times | Times | 30 | |||||||||
| mechanical life | 10000 | ||||||||||
| Item | Unit | Parameter | ||
| Contact opening distance | mm | 12kV/9±1;24kV/13±1;40.5kV/18±1 | ||
| Overtravel | 3.5±0.5 | |||
| Three phase opening and closing at different stages | ms | ≤2 | ||
| Bouncing time of closing contact | 12kV/ ≤ 2; 24kV/ ≤ 2; 40.5kV/≤3 | |||
| Contact pressure of closing contact | N | 20kA | 25kA | 31.5kA |
| 2000±200 | 2400±200 | 3100±200 | ||
| Average opening speed | m/s | 12kV/0.9~1.3; 24kV/1.1~1.6;40.5kV/1.8±0.2 | ||
| Average closing speed | 12kV/0.4~0.8; 24kV/0.6~1.0;40.5kV/0.8±0.2 | |||
