The invention relates to the technical field of ring main units, in particular to a prefabricated
metal closed ring main unit convenient to overhaul, which comprises a box body and four box
doors, the front surface of the box body is open and is provided with an inner cavity, the box
doors are used for closing the box body, the box
doors are divided into two groups, the two groups of box doors are arranged along the width direction of the box body, and the four box doors are arranged in the box body. The two box doors in one group are a first box door and a second box door respectively, the second box door is located on the side, away from the adjacent group of box doors, of the first box door, the first box door can be arranged on the second box door in a sliding mode in the width direction of the box body, and when the first box door slides to be completely opened, the second box door is located on the second box door. The locking
assembly is used for locking the first box door to the second box door, the second box door can be rotationally arranged on the box body around a rotating axis extending in the vertical direction, and after the second box door is rotationally opened, the limiting
assembly is used for preventing the second box door from being reversely closed.