Connecting device between middling pressure breaker contact arm and solid-sealed polar pole

The utility model provides a connecting device between a middling pressure breaker contact arm and a solid-sealed polar pole, comprising a solid main body (10) with a pole end and a wall contact end respectively provided with a projecting part (101,102), the projecting parts (101,102) being both provided with threads. The intermediate part of the solid main body (10) is provided with a shoulder part (103) which has two side surfaces (1031) divided flat. The projecting parts (101,102) are respectively sleeved with at least one taper pad (11). The connecting device raises conductive performance and reduces tolerance requirements of a whole dimension chain.