1.Asynchronous motor protection measurement and control device 2.Friendly person-computer alternation interface 3.LED display YD-831 microcomputer motor monito and control protective device integrates protecting, measuring and controlling, which is used to protect small type motor with voltage 3 to10kV. It has functions of tele-control, tele-metering, tele-signaling and tele-adjusting.Measuring ...