vacuum circuit-breaker

例句：

1. 1.The vacuum circuit-breaker was the key to our success.
   真空断路器是我们成功的关键。
2. 2. The engineer used a vacuum circuit-breaker to disconnect the power.
   工程师使用真空断路器断开电源。
3. 3. The vacuum circuit-breaker is essential for maintaining electrical safety.
   真空断路器对于保持电气安全至关重要。