To minimize the size of each equipment as much as possible, and also arrange the equipment so as to shorten the dimension in a circuit direction.

Bus-integrated disconnectors 10a and 10b, in which main buses A and B are integrated respectively, are placed on opposite sides at the same height. Between the bus-integrated disconnectors 10a and 10b, a T-shaped gas- insulated bus 15, which has a built-in current transformer for bus-sided instruments, is connected. A breaker 1a, which has a built-in current transformer for line-sided instruments, is connected to the bottom of the gas-insulated bus 15 and placed horizontally in a direction perpendicular to the main busses A and B. Next to the breaker 1a, an upward L-shaped disconnector-earthing unit 16 is placed vertically. In addition, an L-shaped gas-insulated bus 17 is placed on the disconnector-earthing unit 16 so as to face to the other side of the main buses A and B.