Mine terminal blocks, including the main body of the terminal blocks. Terminal blocks main insulating shell, and inlet and outlet respectively set at both ends of the insulating shell. Terminal blocks SPD also includes a detachable electrical connection in the main terminal blocks. Terminal blocks body has a through connection of the conductive body and inlet and outlet, and the conductive contact with the SPD ground structure. Ground structure including a conductive film, conductive contact with the SPD, as well as conductive and fixed-conductive filmfasteners. Fasteners through the insulation shell ground. Conductive body has to make way for the Ministry of avoidance fasteners. SPD electrical connections in the conductive body. SPD and the main terminal blocks for the detachable connection, no need to change the size of the main terminal blocks, to facilitate the design of the terminal blocks main body, reduce the difficulty of the design, and the conductive body has to avoid fasteners make way for the Ministry, making the fasteners can be directly throughout the terminal blocks main chassis ground, reasonable structure.