Interlock device of ring main unit

An interlock device of a ring main unit configured to be attached to an inner frame of the ring main unit to control an attachment and detachment of a cable cover, the interlock device comprising:

• a fixed portion configured to be fixed to an inner frame;
• an upper shaft bar configured to be surrounded by an elastic member, and including an elastic member compression platform to be protruded on an outer circumferential surface to compress the elastic member or release a compression through to the elastic member compression platform while moving in a vertical direction in a state of passing through the fixed portion;
• and
• a lower shaft bar configured to be connected to the upper shaft bar in an interlocking manner at a lower side of the upper shaft bar to move in interlocking with the cable cover in a state that the cable cover is inserted thereinto to compress the elastic member or release the compression through the upper shaft bar,
• wherein a movement prevention member is provided between the upper shaft bar and the lower shaft bar,
• wherein an insertion hole is provided on a front surface of the movement prevention member, and
• wherein when the insertion hole is placed below the inner frame and a fixed member is coupled to the insertion hole, the fixed member is configured to be contacted with the inner frame to prevent the detachment of the cable cover.