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Modern Gas Insulated Switchgear (GIS) technology has been undergoing continual development since its introduction in the 1960's when the use of SF 6 as arc extinguishing and isolating medium was first introduced, and whilst many may consider this technology as mature, there have been continuous development driven changes in GIS design, manufacture, test and operation. Consistent research and innovative development led to the nowadays compact and overall optimized switchgear. Today, GIS technology consists typically of a modular design and is filled with a minimum of SF6. The standardized structure is made to match various individual customers' specifications and allows realizing almost all substation configurations accordingly.Furthermore, it offers low life cycle costs with reduced maintenance and can be used for indoor and outdoor applications. And above all, green substation aspects are strongly considered. Keywords-gas insulated switchgear (GIS), insulating gas sulfur hexafluoride SF6, GIS development and trends

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