Siemens 3AH vacuum circuit breaker is an excellent vacuum circuit breaker with stable insulation performance, constant contact resistance, high breaking capacity and so on. Under normal conditions, 3AH vacuum circuit breaker is maintenance-free within 10000 operations.
This manual describes the Siemens 3AH vacuum circuit breaker, a high‑performance medium‑voltage breaker designed for Chinese power‑system requirements. It covers the product’s design, key technical parameters, mechanical life, and environmental limits.
The document includes detailed technical data, wiring diagrams, dimension drawings, operation principles, and ordering information, helping engineers and technicians install, commission, and maintain the breaker safely and efficiently. This manual is written in Chinese.
| Mechanical life | 30,000 operations |
|---|---|
| Breaking time | < 75 ms |
| Arc voltage | 20‑200 V |
| Arc duration | < 15 ms |
| Operating temperature range | +40 °C / -25 °C |
| Rated voltage | 12 kV |
The breaker is maintenance‑free for the first 10,000 operations or 10 years, whichever occurs first.
The mechanical life is rated at 30,000 operations.
The breaker can operate in ambient temperatures from –25 °C up to +40 °C.
Arc voltage is limited to 20‑200 V and the arc duration is less than 15 ms.