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Vacuum Switchgear: An Overview of High Voltage Applications Vacuum switchgear is rapidly gaining popularity in high voltage applications, particularly for systems operating above 36 kV. This technology is increasingly replacing traditional air, SF6 (sulfur hexafluoride), and oil-based switchgear due to its reliability and safety, especially in environments where frequent operation is required. Key Advantages of Vacuum Switchgear Effective Arc Quenching: Vacuum serves as an excellent dielectric medium for arc quenching.