An air-insulated disconnector is a crucial component in electrical power systems, designed to provide isolation for maintenance and ensure the safety of personnel and equipment. This type of disconnector is employed in outdoor and air-insulated substations where the electrical conductors are surrounded by ambient air. They are made with porcelain and silicon composite insulators up to 800kV. On the MV system, it can be used with fuses. When using fused types the end user can protect the line or the transformer with fuses.