Overview
The VS1-12 side-mounted vacuum circuit breaker is indoor high-voltage switchgear, suitable for use in three-phase power systems with a rated voltage of 12 kV and a frequency of 50 Hz, as protection and control equipment. Due to the special advantages of vacuum circuit breakers, it is especially suitable for applications requiring frequent operations at rated current or multiple interruptions of short-circuit current.
The VS1-12 side-mounted vacuum circuit breaker adopts fixed installation and is mainly used in fixed switchgear. This circuit breaker can be used independently or in ring network power supply, box-type substations, or various non-standard power supply systems.
Main Technical Parameters
| No. | Item | Unit | Data | |||
| 1 | Rated voltage | kV | 12 | |||
| 2 | Rated frequency | Hz | 50 | |||
| 3 | Rated current | A | 630~1250 | 1250 | 1250 | |
| 4 | Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | |
| 5 | Rated short-circuit making current | kA | 50 | 63 | 80 | |
| 6 | Rated peak withstand current | kA | 50 | 63 | 80 | |
| 7 | 4S rated short-circuit withstand current | kA | 20 | 25 | 31.5 | |
| 8 | Rated insulation level | Power frequency withstand voltage (before and after rated breaking) | kA | 42 (48 across open contacts) | ||
| Impulse withstand voltage (before and after rated breaking) | 75 (85 across open contacts) | |||||
| 9 | Rated operating sequence | O-0.3S-CO-180S-CO | ||||
| 10 | Mechanical life | times | 10000 | |||
| 11 | Number of rated short-circuit breaking current interruptions | times | 50 | |||
| 12 | Rated closing voltage of operating mechanism (DC) | V | 110,220 | |||
| 13 | Rated opening voltage of operating mechanism (DC) | V | 110,200 | |||
| 14 | Contact gap | mm | 11±1 | |||
| 15 | Over-travel (contact spring compression length) | mm | 3.5±0.5 | |||
| 16 | Three-phase opening and closing bounce time | ms | ≤2 | |||
| 17 | Contact closing bounce time | ms | ≤2 | |||
| 18 | Average opening speed | m/s | 1.1±0.2 | |||
| 19 | Average closing speed | m/s | 0.6±0.2 | |||
| 20 | Opening time | At maximum operating voltage | s | ≤0.05 | ||
| At minimum operating voltage | ≤0.08 | |||||
| 21 | Closing time | s | 0.1 | 50 | ||
| 22 | Main circuit resistance of each phase | uΩ | 60 | |||
| 23 | Allowable cumulative wear thickness of moving and static contacts | mm | 3 | |||
