A power breaker strip comprising a strip support and a plurality of interphase spacer elements, and a plurality of interline spacer elements, assembled with the plurality of interphase spacer elements such that each interline spacer element extends at least partly between two consecutive interphase spacer elements. The interphase spacer elements and the interline spacer elements together delimit a plurality of per pitch zones of the strip in which connection terminals of several lines of electrical cables can be inserted.