A an open relay device and system includes a chassis having one or more openings; external connectors on a first wall of the chassis, the external connectors having a plurality of external connection terminals; ground bussing modules attached to a second wall of the chassis; junction bussing modules attached to a third wall of the chassis; relay sockets attached to a fourth wall of the chassis; and wiring electrically connecting the external connectors to the ground bussing modules, the junction bussing modules, and the relay sockets, the wiring further electrically connecting the relay sockets to the junction bussing modules and the ground bussing modules.