国产的一级黄色视频免费看,又粗又爽又猛高潮的在线视频,麻豆操逼网,99国产在线精品观看二区

High voltage contacts in mining areas, high-voltage AC vacuum contactor is a common electrical switches, mainly used as frequently or breaking the AC main circuit and can be remotely controlled, the main control object is a motor or transformer.

Low capacity contactors can also be applied capacitive load circuit. DC magnetic vacuum contactor coil system operations into a single dual-diameter winding and winding diameter.