A multi-phase switching device assembly comprises a plurality of interrupter units (1, 2, 3). The interrupter units (1, 2, 3) are each associated with a phase of an electrical energy transmission system and each have a first and a second cartridge-shaped contact piece carrier (5, 6). A break (8) is arranged in each case between the cartridge-shaped contact piece carriers (5, 6). A crossbar (11, 12) is attached to the cartridge-shaped contact piece carriers (5, 6) on the shell side. The crossbar (11, 12) stabilizes the interrupter units (1, 2, 3) with respect to one another.
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