Electrical system comprising an electrical unit and an interchangeable connection module

An interchangeable connection module for electrically connecting an electrical switching unit to an electrical installation with electrical links, the electrical unit comprising a connection interface including at least one electrical contact and at least one elastic holding strip that is deformable between a depressed position and a released position,

• said connection module being movable between a position wherein the connection module is connected with the unit and a position wherein the connection module is disconnected from the unit, wherein said connection module comprises a casing, at least one connection piece and an actuation button,
• each connection piece being configured to provide an electrical connection between an end of an electrical link and one of the electrical contacts of the unit when the connection module is connected with the unit, and including at least one connection portion that projects outside the casing, each connection piece being held in contact with an electrical contact of the unit by a corresponding elastic holding strip of the unit when this strip is in the released position thereof and the module is connected with the unit, this holding not being exerted when the strip is in the depressed position thereof,
• the button being translatably movable, relative to the casing of the module, between a rest position and a pressed position and including at least one bearing portion projecting outside the casing when the button is in the pressed position thereof, each bearing portion being adapted in order to move a corresponding deformable elastic strip into the depressed position thereof when the module is connected with the unit and the button is moved into the pressed position thereof,
• and wherein the connection module includes a locking device that is capable of cooperating with a locking interface of the unit, it being possible to actuate this locking device with the button.