Air Insulated Switchgears (AIS)Optimum T&D2021-02-27T16:47:38+06:00 Project Description VHIH: 12/17.5kV Air Insulated SwitchgearVHID: 12kV Double Busbar Air Insulated SwitchgearVH1H-S: 12kV Air Insulated SwitchgearVH1F: 12kV Fixed VCB Air Insulated SwitchgearVH2: 24kV Air Insulated SwitchgearVH3/VH3D: 36-40.5kV Air-Insulated Single & Double Busbar Switchgear