An electrical device, which is assembled from modules or includes assembled modules, the modules each including an electronic circuit mounted on a respective heat sink, the modules being configured as nodes of a system bus that also leads to an electronic circuit designed as a node of the system bus, the electronic circuit being configured in a lower part that is configured in a recess of the housing of the electrical device; an upper part being detachably connectable to the lower part; a memory element being configured in the upper part; and data lines for reading out the memory element via the electronic circuit being routed via a plug connection to the electronic circuit.