Product Overview
ZW20-12 outdoor high-voltage AC boundary vacuum circuit breaker, rated 12kV, 3-phase 50Hz, switches load, overload and short-circuit currents. It serves substations, industrial plants and urban/rural grids, fits frequent operation and distribution automation; paired with controllers to realize reclosing. SF₆ filled sealed cabinet enables maintenance-free use, reliable spring mechanism makes it ideal for pole-mounted installation.
Model and Meaning
Service Conditions
- Ambient air temperature: -40℃ ~ +40℃; Daily temperature difference: maximum daily temperature variation ≤ 25℃.
According to the physical properties of SF₆ gas, SF₆ remains gaseous to ensure normal product operation when the internal tank pressure is 0.05 MPa at ambient temperature of -40℃. (At ambient temperature of -40℃ and gauge pressure of 0.05 MPa, the liquefaction point of SF₆ is -55℃; at zero gauge pressure, the liquefaction point of SF₆ will not exceed -60℃).
- Maximum wind speed: 35 m/s;
- The installation site shall be free from fire & explosion hazards, severe chemical corrosivesubstances (such as various acids, alkalis, dense fumes, etc.) and violent vibration.
- Altitude: ≤ 1000 m;
- Ice coating thickness: 10 mm;
- Pollution degree: Class IV;
- Seismic intensity: ≤ Grade 7;
- Neutral grounding modes of power grid: isolated neutral, neutral grounded via arc-suppression coil, neutral grounded via low resistor.
Technical Parameters
| No | Project | unit | Value |
| 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 closing current peak | kA | 50 |
| 6 | Rated dynamic current value | kA | 50 |
| 7 | 4s thermal stability current | kA | 20 |
| 8 | Rated operation sequence | Open-0.3s-Close-180s-Close-Open | |
| 9 | Rated energy storage motor voltage | V | AC220 |
| 10 | Highest/lowest stored motor voltage | V | AC242/187 |
| 11 | Rated closing operation voltage | V | AC220 |
| 12 | Highest/lowest closing operation voltage | V | AC264/143 |
| 13 | Rated opening operating voltage | V | AC220 |
| 14 | Highest/lowest opening operating voltage | V | AC264/143 |
| 15 | Switching period | ms | ≤2 |
| 16 | Opening time | ms | ≤2 |
| 17 | SF6 gas rated pressure(gauge pressure) | Mpa | 0.01 |
| 18 | Rated short-circuit current breaking frequency | Times | 30 |
| 19 | Mechanical life | Times | 10000 |
Internal structure
