To reduce the area of a mounting plate with a disconnector or the like arranged three-dimensionally, so as to reduce the installation space of the switchgear by a method, wherein the operating means of the disconnector or the like is arranged under the mounting plate, a vertical plate is installed on the mounting plate nearly at right angles to the mounting plate and the disconnector and a grounding switch are attached to the vertical plate.

Cable heads CHD and vacuum circuit breakers VCB are attached directly to a mounting plate 1 at the inside of a container 2, disconnectors DS and grounding switches ES are attached indirectly to the mounting plate 1 via respective vertical plates 9, 10. U-shaped insulators are attached to a face on the left side of one out of the two vertical plates 9 which are attached at right angles on the mounting plate 1 and to the both faces of the other, fixation-side conductors 12 are attached to the upper parts of the respective insulators, and moving-side conductors 13 are attached to lower parts. In addition, the mounting direction of the disconnectors or the like attached to the vertical plates is selected, and the layout range of a device can be expanded.