Patent ID: 7826233

Claim:
A cassette for an electrical switching apparatus comprising: a plurality of sidewalls coupled together to define an enclosed space, said sidewalls including a right sidewall and a left sidewall; said right sidewall and said left sidewall each structured to support at least one component; at least one component coupled to said right sidewall; at least one component coupled to said left sidewall; wherein said right sidewall does not have any mounting hardware extending substantially outwardly from the plane of the right sidewall; wherein said left sidewall does not have any mounting hardware extending substantially outwardly from the plane of the left sidewall; wherein: said right and left sidewalls each have a plurality of openings therein; said at least one component is coupled to an associated sidewall by threshold mounting fasteners; each said threshold mounting fastener extending through said at least one component and into one said sidewall opening; wherein: each threshold mounting fastener has a head and a shaft; each said threshold mounting fastener head being disposed within said enclosed space; wherein: said at least one component is a support rail and extension rail assembly having a pair of opposed base plates each with a exterior surface having a plurality of protrusions; said right sidewall having a plurality of mounting openings; said left sidewall having a plurality of mounting openings; wherein each said base plate plurality of protrusions are structured to be disposed within said plurality of mounting openings on the associated sidewall; wherein each protrusion within said base plate plurality of protrusions has a thickness generally corresponding to the thickness of said associated sidewall; wherein: said right sidewall having a slot; said left sidewall having a slot; said plurality of sidewalls includes a bottom sidewall, said bottom sidewall having lateral, tab-like extensions; and said bottom sidewall extensions including at least one short extension; said at least one short extension structured to fit within a slot and having a length in the lateral direction corresponding to the thickness of the associated sidewalls.