A plug-in device for use with a busway system comprising a busway housing defining a longitudinal axis includes a stab base housing having first and second opposite sides, one or more stab conductors extending out of and away from the stab base housing at each of the first and second sides of the stab base housing, and a first alignment tab on the first side of the housing and a second alignment tab on the second side of the housing. The stab base housing is configured to be received through an opening at a bottom portion of the busway housing and positioned in a first position and then rotated from the first position to a second position. The first and second alignment tabs are configured to allow rotation from the first position to the second position in only one rotational direction.