NES is suitable for single-bus and single-bus segmented systems with three-phase AC 50Hz, rated voltage up to 12kV, and bus and feeder currents up to 4000A as indoor armored removable AC metal-enclosed switchgear for receiving and distributing electrical energy. It has a perfect primary solution, which provides an excellent choice for medium voltage power systems. Its design meets the technical standards of international standards such as GB, IEC and ANSI.