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。
2
For such motor running overcurrent protection device must be to install.
对于这样运行的电机必须加装过流保护装置。
3
The method and the device acquire and judge the alternating current directly, shorten the signal acquisition time and the protective time during overcurrent.