The 12 kV ET1 Alternating-current Metal-enclosed Switchgear is an indoor, metal-enclosed, air-insulated medium voltage switchgear. This switchgear combines a new vacuum interrupter and proven epoxy insulation technology, and is fully type tested and optimized for safety, reliability, economy and efficiency. This switchgear can be used in power plants, substations, industrial and mining enterprises and high-rise buildings. Its small 550 mm cabinet frame makes it especially suitable for commercial real estate, data centers, on-site modification and other space-constrained projects.