The MISELA / NILELA series gas–insulated switchgear (C–GIS) represents the latest generation of power distribution technology, combining solid and gas insulation, vacuum interruption, modular plug–in design, optimized heat dissipation, and helium leak detection. Featuring high reliability, compact and maintenance–free design, the system adopts solid–sealed poles and a modular structure to achieve a 30–year maintenance–free lifecycle and an ultra–low gas leakage rate (≤0.05%) . It is ideally suited for intelligent substation applications.