国产真人做受视频在线观看,国产精品不卡无毒久久久久,一级一片免费播放,高清无码在线播放 ,亚洲精品第一国产综合野草社区,国产亚洲精品一,二区,2021天天爽天天玩天天拍,色窝视频

GCK Low-voltage switchgear   Low-voltage switchgear 

It is suitable for three-phase four-wire and three-phase five-wire power systems with three-phase AC 50, (60) Hz, rated working voltage and rated insulation voltage of 380 (400) V, 660 V and rated current of 6300 A and below, and is widely used in power plants, substations, industrial and mining enterprises, buildings and hotels, airports, terminals and communication centres such as radio and television, as power generation, power transmission and distribution, electrical energy conversion and power distribution of electrical energy consumption. It is used as a PC and motor control centre MCC in power generation, transmission and distribution, power conversion and power consumption.