A bussed electrical center comprising: an electrical assembly that includes a lower housing, a printed circuit board, an upper housing, and electrical devices, wherein the lower housing slideably engages an outer housing that retains a plurality of electrical connectors having a plurality of electrical terminals, said printed circuit board interposed between and enclosed within the upper housing and the lower housing, said printed circuit board having a plurality of corresponding electrical terminals configured to mate with the plurality of electrical terminals of the plurality of electrical connectors, said corresponding electrical terminals projecting beyond the lower housing, said upper housing removably attached to the lower housing, said electrical assembly defines a guide hole that passes through the upper housing, the printed circuit board, and the lower housing, said guide hole defines a shoulder in the upper housing; and a single fastening feature consisting of one first fastener element positioned within the guide hole, said first fastener element having a flange and a shank, said shank operable to engage one second fastener element disposed within the outer housing, said flange engages the shoulder, wherein the electrical assembly is drawn into the outer housing when the first fastener element and the second fastener element are tightened together, whereby the plurality of electrical terminals are mated with the plurality of corresponding electrical terminals, wherein the outer housing and the electrical assembly are secured to each other solely by the single fastening feature. wherein the lower housing includes alignment towers and the plurality of electrical connectors include alignment holes, wherein said alignment towers slideably engage the alignment holes prior to engagement of the lower housing with the outer housing. an electrical assembly that includes a lower housing, a printed circuit board, an upper housing, and electrical devices, wherein the lower housing slideably engages an outer housing that retains a plurality of electrical connectors having a plurality of electrical terminals, said printed circuit board interposed between and enclosed within the upper housing and the lower housing, said printed circuit board having a plurality of corresponding electrical terminals configured to mate with the plurality of electrical terminals of the plurality of electrical connectors, said corresponding electrical terminals projecting beyond the lower housing, said upper housing removably attached to the lower housing, said electrical assembly defines a guide hole that passes through the upper housing, the printed circuit board, and the lower housing, said guide hole defines a shoulder in the upper housing; and a single fastening feature consisting of one first fastener element positioned within the guide hole, said first fastener element having a flange and a shank, said shank operable to engage one second fastener element disposed within the outer housing, said flange engages the shoulder, wherein the electrical assembly is drawn into the outer housing when the first fastener element and the second fastener element are tightened together, whereby the plurality of electrical terminals are mated with the plurality of corresponding electrical terminals, wherein the outer housing and the electrical assembly are secured to each other solely by the single fastening feature. wherein the lower housing includes alignment towers and the plurality of electrical connectors include alignment holes, wherein said alignment towers slideably engage the alignment holes prior to engagement of the lower housing with the outer housing.