Modular electrical device providing at least two electrical functions, such as a differential circuit breaker

The invention relates to a modular electrical apparatus providing at least two electrical functions, the apparatus comprises at least one upstream terminals and at least one downstream terminals (10-13), and including at lest two modules (1, 2, 3). Each module ensures an electrical function, where one of the modules (1, 2, 3) supports one upstream terminal (10-13) to which that module is electrically connected, while differential module supports one downstream terminal (10-13) to which that module is electrically connected. The modules (1, 2, 3) are electrically connected to each other duringfinal assembling operation of the apparatus.