ZW20A-12 type outdoor AC vacuum circuit breaker is s used in three-phase power system of AC 50Hz, rated voltage 10kV to 12kV, as breaking, making load current. Also, the circuit breaker has the function of overload and short circuit protection, controlling, measuring, remote control and remote monitoring. This circuit breaker is applied in industrial and mining enterprises, power plant and substation for electric equipment's control and protection, and also it can be used on the occasion of frequent operation of rural power grids due to circuit breaker's repeatedly interrupting and fast reclosing ability. It accords with the standards of IEC62271-100 & GB1984 AC high voltage circuit breaker, GB/T 11022 HV General technical requirement of switch and control apparatus.
Ambient condition :
1. Altitude: ≤1000mm;
2. Ambient temperature: -40°C ~+44°C ;
3. Wind speed: 34m/s;
4. Applicable occasions should free from inflammables, explosives, corrosives.
Main technical parameters of pole vacuum circuit breaker:
| No | Item | Unit | Value | |
| 1 | Rated voltage | kV | 12 | |
| 2 | Rated current | A | 630/1000 | |
| 3 | Rated frequency | Hz | 50 | |
| 4 | Rated short circirt breaking current | kA | 12.5/16/20/25 | |
| 5 | Rated short circuit withstand current (peak) | kA | 31.5/40/50/63 | |
| 6 | Rated short time withstand current 4s | kA | 12.5/16/20/25 | |
| 7 | Rated short circuit making current (peak) | kA | 31.5/40/50/63 | |
| 8 | Mechanical endurance | times | 10000 | |
| 9 | Rated current breaking times | times | 10000 | |
| 10 | Breaking operations of rated short-circuit breaking current | times | 30 | |
| 11 | 1min power frequency withstand voltage | Between phase | kV | 42 |
| To earth | 48 | |||
| 12 | Lightning impulse withstand voltage | Between phase | kV | 75 |
| To earth | 85 | |||
| 13 | 1min power frequency withstand voltage of secondary circuit | kV | 2 | |
ZW20-12 drawing:
