The ZCW-126/T2000-40 open type combined apparatus is a complete set of combined equipment that uses air as the external insulation and SF₆ gas as the arc-extinguishing medium. It is used for the control and protection of three-phase AC 126kV transmission and distribution systems, and can also be used for liaison intervals and switching capacitor banks. It is suitable for urban substations, enterprise substations, and mountainous substations where land is scarce.