Electrical switching apparatus and secondary disconnect assembly with error-proofing features therefor

An electrical switching apparatus comprising:

• a housing;
• a number of accessories;
• and
• a secondary disconnect assembly for electrically connecting and disconnecting said accessories, said secondary disconnect assembly comprising:
• a terminal block assembly comprising a mounting member, at least one terminal block removably mounted on said mounting member, and a number of accessory plugs structured to be removably inserted into said terminal block to be electrically connected to said terminal block,
• wherein said terminal block has a width and a plurality of receptacles structured to receive a plurality of said accessory plugs side-by-side within the width of said terminal block,
• wherein said terminal block and said accessory plugs each include a plurality of error-proofing features,
• wherein said error-proofing features prohibit insertion of said accessory plugs into said terminal block unless said accessory plugs are correctly disposed in a predetermined orientation, and
• wherein said mounting member is a molded member.