HDC15-12 serie switchgear is a new generation of environmentally friendly without SF6 gas insulated metal enclosed switchgear (viz, a new generation for GPR RMU) developed by Dechun. Use N2 instead of SF6 gas, but at the same time to ensure that the new generation of GPR ring cabinet is the same with the traditional SF6 ring network cabinet in function and performance. It meets the national and industry standards, do not change the user's conditions of use, do not change the operation and maintenance habits and provides users with a safer, more efficient, more green new experience.