The utility model discloses a busbar suitable for current transformers of different specifications. The busbar comprises a front segment bar, a middle segment bar and a back segment bar, wherein adjacent ends of the front segment bar and the back segment bar are provided with bolt holes; the two ends of the middle segment bar are provided with bolt holes matched with the two bolt holes respectively; bolts pass through the bolt holes at the two ends of the middle segment bar respectively, and are fixedly connected with the bolt holes in the adjacent ends of the front segment bar and the back segment bar; the distance between the front segment bar and the back segment bar is 10 centimeters; the bolt holes in the adjacent ends of the front segment bar and the back segment bar are waist round holes; the axial lines of the two screw holes are positioned on the same straight line; the distance between near ends of the two screw holes is smaller than or equal to 10 centimeters while the distance between far ends is more than or equal to 20 centimeters; and the width of the middle segment bar is smaller than or equal to 10 centimeters. Due to the adoption of a three-segment design, the busbar is suitable for mutual inductors of various models, installation personnel do not need to break bars and open holes on field, the installation quality is improved, and the working efficiency is increased.