The invention relates to a connector element for two installation breakers, adjacently attached with the broad faces thereof in contact, in particular, power breakers or residual current breakers, the housings of which are each formed from two dished housing pieces. The connector element comprises an approximately cylindrical base body with a first external diameter on the front side of which two radially-sprung, axially projecting first and second expanding arms are moulded. The external contours of the spreader arms lie on a cylindrical outer surface, the external diameter of which is smaller than the first external diameter of the base body. The free ends thereof comprise radially projecting lugs on opposed external lines, which, in the assembly state, clip behind recesses on the housings, for connection by means of the connector element, of adjacent installation breakers. A sprung spreader element is mounted between a first and second spreader arm such that the spreader element supports the sprung spreading of the spreader arms, and which impedes the sprung contact of the first and second spreader arms with each other.