MODULAR ELECTRICAL DEVICE IN WHICH EACH MODULE IS INTENDED FOR BEING SECURED TO A RESPECTIVE MOUNTING, AND ELECTRICAL SYSTEM COMPRISING SUCH AN ELECTRICAL DEVICE

The electrical device (114) comprises: a main module (116); an auxiliary module (118) electrically connected to the main module (116); at least one fastener attaching the auxiliary module (118) to the main module (116) in order to prevent the auxiliary module (118) from detaching from the main module (116), the fastener or fasteners allowing movement of the auxiliary module (118) relative to the main module (116), according to a front-rear direction (Av-Ar), between a position close to and a position distant from the main module (116).