放荡少妇张开双腿任人玩-亚洲香蕉中文日韩V日本-日本熟妇无码免费视频色播-开心五月激情综合婷婷色

Does the driving slide contact line have to have a power indicator?

Not necessarily. Because from the current technology, it is not necessary to have a power indicator on the driving sliding contact line, but can also be replaced by a phase sequence protector.

Moreover, if the phase sequence protector is used, it is locked with the main contactor, so that the safety performance of the sliding contact line can be greatly improved when it is used.