The utility model relates to an install bus circuit board in joining in marriage rack disengaged line travelling wave trouble range unit, the bus circuit board include PCB board and 5 european style connectors of a rectangle, characterized by: on the bus circuit board, to follow long limit equidistance and divide into 5, each position is equipped with 96 holes, presses 3 32 array alignment for the european style connector of welding 96pin needle, with the connecting wire connection of etching between the hole that every european style connector corresponds, 5 european style connectors through its pin needle for the stitch soldering tin weld on the PCB board. The utility model has the advantages that: the different PCB plates of joining in marriage among the rack disengaged line travelling wave trouble range unit can be inserted wantonly on these 5 european style connectors, can exchange each other, can not influence installation and device operation function.