second breaker card

例句：

1. 1.The second breaker card is essential for the safe operation of the machine.
   第二断路器卡对于机器的安全运行至关重要。
2. 2.The technician carefully removed the second breaker card to inspect the wiring.
   技术人员小心翼翼地取下第二断路器卡来检查电线。
3. 3. During maintenance, the second breaker card was replaced to ensure proper functioning.
   在维护期间，更换了第二断路器卡以确保正常工作。