WRM2E series switch is an intelligent measurement switch independently developed and produced by our company, which is suitable for AC 50Hz, shell current 250A (rated current 125A, 160A, 200A, 250A), rated insulation voltage 1000V, rated working voltage 400V three-phase four-wire, neutral point direct grounding power distribution network. This intelligent measurement switch has a number of IoT sensing functions such as HPLC communication, high-precision AC sampling, power supply relationship topology identification, metering box management, power theft early warning, power outage event reporting, line loss analysis and judgment, terminal temperature detection, fault automatic diagnosis, etc., with a variety of protection functions such as overload long delay, short circuit short delay, short circuit instantaneous, overvoltage and undervoltage and phase failure, etc., which play a protective role in line and power supply equipment, and the detection and monitoring of the load side can reduce the operation and maintenance cost of the power grid. It can provide the necessary data support for future energy efficiency systems.