the present invention includes a modular electrical device for use in an electric circuit . the modular electrical device includes a wall plate defining a first opening , and a housing configured to be disposed within the first opening . the housing is configured to accommodate a frame member selected from a plurality of frame members . each frame member is configured to accommodate at least one wiring assembly . the modular electrical device further includes an electrical wiring assembly chosen from a plurality of electrical wiring assemblies . each of the plurality of electrical wiring assemblies has a different functional configuration , and each of the plurality of electrical wiring devices being sized to fit in the selected frame member . the modular electrical device further includes a set of terminal contacts selected from a plurality of sets of terminal contacts . each set of terminal contacts is matched to accommodate one of the plurality of electrical wiring assemblies .