Main breakers provide overcurrent protection and a single disconnect point for all power in a switchboard or device.

主开关能够提供过电流保护，是配电盘或设备的电源断开点。

youdao

Main breakers provide overcurrent protection and a single disconnect point for all power in a switchboard or device.

主开关能够提供过电流保护，是配电盘或设备的电源断开点。

youdao