Overview
The VS1-12 type permanent magnet indoor high voltage vacuum circuit breaker is an indoor switchgear for three-phase AC 50Hz power systems with a rated voltage of 12kV. It serves as a protection and control unit for power grid equipment and power equipment of industrial and mining enterprises. It is suitable for applications requiring frequent operations at rated working current or multiple breaking of short-circuit currents.
The circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body. It can be used as a fixed installation unit or equipped with a dedicated propulsion mechanism to form a withdrawable unit.
Performance Advantages
This product is equipped with a bistable permanent magnet operating mechanism. The mechanism contains permanent magnets that provide holding force to maintain the switch in the closed or open state. Compared with conventional spring operating mechanisms, the number of mechanical parts is greatly reduced and the mechanical transmission chain is shortened, thereby greatly improving switch reliability and significantly increasing mechanical life.
Main Technical Parameters
| No. | Name | Unit | Data | ||||||
| 1 | Rated voltage | kV | 12 | ||||||
| 2 | Rated frequency | Hz | 50 | ||||||
| 3 | Rated insulation level | 1min power frequency withstand voltage | kA | Phase-to-ground / phase-to-phase 42/48 | |||||
| Lightning impulse withstand voltage (peak) | Phase-to-ground / phase-to-phase 75/85 | ||||||||
| 4 | Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | 40 | |||
| 5 | Rated current | A | 630 | 630 | 1250 | 1600 | 1250 | 1600 | |
| 1250 | 1250 | 2000 | 2500 | 2000 | 2500 | ||||
| 6 | Rated short-time withstand current (RMS) | kA | 20 | 25 | 31.5 | 40 | |||
| 7 | Rated peak withstand current (peak) | 50 | 63 | 80 | 100 | ||||
| 8 | Rated short-circuit making current (peak) | 50 | 63 | 80 | 100 | ||||
| 9 | Rated short-circuit current duration | S | 4 | ||||||
| 10 | Mechanical life | Operations | 20000 | ||||||
| 11 | Secondary circuit power frequency withstand voltage (1min) | V | 2000 | ||||||
| 12 | Rated operating sequence | Open -t- Close-Open -t1- Close-Open | |||||||
Note: 20kA, 25kA, 31.5kA t=0.3s t1=180s; 40kA t=180s t1=180s
