The utility model relates to a bus bar. This bus bar includes the bus bar body and locates the insulation support of the outer peripheral face of bus bar body, and the bus bar body includes the length link that the direction is extended about along, the link be equipped with connection structure, connection structure be connecting screw rod or connecting hole, the insulation support outlying of locating connecting screw rod or connecting hole including the ring be used for fixing a position the first position sleeve of the corresponding second position sleeve of cartridge or suit. Because the positioning action of first position sleeve is easier when bus bar is connected with other bus bar or annex.