Overview
The ZW32-12 permanent magnet outdoor vacuum circuit breaker (hereinafter referred to as the circuit breaker) is an outdoor power distribution device with a rated voltage of 12kV, three-phase AC 50Hz. It is mainly used for breaking and closing load current, overload current, and short-circuit current in power systems. It is suitable for protection and control in substations and industrial and mining enterprise power distribution systems, as well as for locations with frequent operations in rural power grids.
This circuit breaker features small size, light weight, anti-condensation, and maintenance-free characteristics, and can adapt to harsh climatic conditions and polluted environments.
Performance Advantages
This product adopts a permanent magnet operating mechanism for operation; since the permanent magnet operating mechanism provides holding force through permanent magnets to keep the switch in the open or closed position, it has few mechanical parts and a short mechanical transmission chain, thereby greatly improving the reliability and mechanical life of the switch.
Main Technical Parameters
| No. | Item | Unit | Parameter |
| 1 | Rated voltage | kV | 12 |
| 2 | Rated frequency | Hz | 50 |
| 3 | Rated current | A | 630 |
| 4 | Rated short-circuit breaking current | kA | 20 |
| 5 | Rated peak withstand current (peak) | kA | 50 |
| 6 | Rated short-time withstand current | kA | 20 |
| 7 | Rated short-circuit making current (peak) | kA | 50 |
| 8 | Mechanical life | operations | 10000 |
| 9 | Number of breaking operations at rated short-circuit breaking current | operations | 30 |
| 10 | Power frequency withstand voltage (1min): (wet)/(dry) phase-to-phase, phase-to-ground/break | kV | 42/48 |
| 11 | Lightning impulse withstand voltage (peak) phase-to-phase, phase-to-ground/break | kV | 75/85 |
| 12 | Secondary circuit 1min power frequency withstand voltage | kV | 2 |
