Circuit breaker structure
ZW7 40.5kv outdoor high-voltage vacuum circuit breaker is mainly composed of integrated pole, current transformer, operating mechanism and box. This type of circuit breaker is of miniaturized design, and the shell is made of high-quality steel box. Current transformers can be selected according to user needs. ZW7 40.5kv outdoor high-voltage vacuum circuit breaker and matching intelligent control combination. The switch opening and closing operation can be realized locally, and it can also be remotely operated through the communication interface. Other information of the circuit breaker can also be transmitted to the control center, and the communication channel can choose cable, optical fiber, GPRS/CDMA, GSM, etc.
The ZW7 40.5kv outdoor high-voltage vacuum circuit breaker is a three-phase AC 50Hz device designed for outdoor installation in 35-40.5kV power systems, ideal for breaking and closing load currents, overloads, and short-circuit currents. As trusted vacuum circuit breaker suppliers, KamPA Electric manufacturers provide this porcelain pillar insulator model with spring or electromagnetic operating mechanisms for reliable control and protection in substations, power plants, urban/rural grids, and industrial/mining sites. Key features include excellent vacuum arc extinction for high breaking capacity, compact structure with long mechanical life (up to 10,000 operations), anti-aging porcelain housing resistant to harsh weather (-40°C to +40°C), low maintenance, no fire/explosion risk, and customization options like OEM/ODM, white-label for distributors, electrical contractors, and bulk buyers seeking competitive wholesale prices from China factories.
Features
1. Extremely high reliability
2. Completely maintenance-free throughout its lifetime
3. Has high mechanical and electrical life
4. The whole machine is small in size, light in weight, easy to install
Conditions of Use
1. Ambient air temperature: -30℃～+60℃;
2. Altitude: no more than 2000 meters;
3. The wind speed does not exceed 34m/s;
4. Vibration or ground motion from outside the switchgear and control equipment is negligible;
5. Contamination level: IV;
6. Storage temperature -40℃～+85℃.
Product Paramenters
| S/N | Item | Unit | Data |
| 1 | Rated voltage | kV | 40.5 |
| 2 | Rated current | A | 1250/1600 |
| 3 | Rated frequency | Hz | 50/60 |
| 4 | Power frequency withstand voltage 1min (wet)(dry) Phase-to-phase, to ground/fracture | kV | 80 95/95 |
| 5 | Lightning impulse withstand current (peak value)
Phase-to-phase, to ground/fracture |
kV | 185 |
| 6 | Rated short-circuit breaking current | kA | 21/31.5 |
| 7 | Rated short-circuit making current (peak) | kA | 63/80 |
| 8 | Rated peak withstand current | kA | 63/80 |
| 9 | 4S short-time withstand current | kA | 21/31.5 |
| 10 | Rated operating cycle | O-0.1s – CO – 3s – CO – 6s CO- 60s recovery | |
| 11 | Rated short-circuit current breaking times | times | 30 |
| 12 | Mechanical life | times | 10000 |
| 13 | Mechanism control voltage | V | AC/DC 220 |
| 14 | Secondary circuit 1min Power frequency withstand voltage | kV | 2 |
