An electrical system includes an electrical module including a conductive plate, a casing having a bottom face mounted on a top face of the conductive plate while leaving at least a part of the top face revealed, a shielding including a body intended to at least partly cover the casing, and an electronic circuit board for controlling the components of the casing, intended to cover the shielding in order for the shielding to protect the electronic circuit board from the electromagnetic radiations emitted by the electrical components of the casing in their operation. The shielding further includes at least one tab made of a piece with the body of the shielding and extending downwards so as to come into contact with a respective revealed part.