GZS1 Type of indoor metal-clad draw-out switchgear GZS1 indoor metal-clad draw-out switchgear, developed by Shanghai Dahua Electrical company, is suitable for use in AC. 3.6 ~ 12KV, 50Hz,single-busbar or sectioned single busbar switchgear, mainly used in Elec. generating plants, middle / small power stations, power distributing system of enterprises or industries or substations as Elec. power receiving or distributing equipment or big-power H. voltage motor starting equipment, and so on. The switchgear has functions of control, protection and monitoring