An installation for the electrical connection between an assembly of items of electrical equipment which are affixed onto a common baseplate and a system for command and control of that assembly. The installation includes an electrical interface device which provides a connection of signals from the equipment in the assembly with the signal linkage connected to the system. The interface device can be mechanically dissociated from the base plate and is attached to it by a detachable fixing element. The device includes a casing which houses a printed circuit by which two connectors are located which respectively provide the electrical connection with the assembly and with the linkage and which are interconnected through a printed circuit. One of the connectors is specifically adapted to the type of linkage used.