Plug Top Series:
63A      13Amp Fused plug top
63A+     13Amp Fused plug top
383      13Amp Fused plug top
383A     13Amp Fused plug top
383AT    13Amp Fused plug top, Outer color with red or green or blue
383L     13Amp Fused plug top with lamp
688      13Amp Fused plug top
5678A    13Amp Fused plug top
1997     15Amp plug top
1996     5Amp  plug top