The environmental-friendly gas-insulated unit is a type of power equipment that uses environmentally friendly gases (such as dry air, nitrogen, or other environmentally friendly mixed gases) as the insulation medium inside the switch cabinet instead of traditional sulfur hexafluoride. It is a new generation of environmentally friendly ring main units developed with modern vacuum interrupters as the breaking elements. The core advantages are extremely low greenhouse effect and maintenance-free. The environmental-friendly gas cabinet products are suitable for secondary distribution networks of power systems with a voltage level of 12kV, as well as power supply systems in residential areas, commercial buildings, light industrial enterprises, and infrastructure.