Why not put a 200a breaker in the bucket? or is bucket damaged...hence the DO NOT USE piece of tape.
i would need to pull new wiring into it either way.There might be a good reason it is tagged DO NOT USE, I would suggest that you look into the bus connection first and see why the tag is there...And power the board down before you go looking for a surprise.
considering the size of it, it was surprisingly only rated for 30 or 40a inside on the little nameplateWhat size is the bucket disconnect, should be labeled on the side of it. If it were big enough, I would get the factory trailing fuse block kit. If it's only a 100A switch, I think your into tapping the bus, for something adequate. The bus taps to the existing switch may not be large enough.
I did some basic checking on that Size 2 part number. It was a two speed size 2 combination starter. In these size applications they typically came with a 60 or sometimes 100A disconnect switch and a trailing fuse block with 60 or100A fuse holders.
In terms of calling it bucket, thats probably a mis-speak. It doesn't plug on to the bus on this MCC. Each seperate motor controller has a nipple into the back MCC enclosure and the disconnect is connected with wires. Unfortunately I didnt take a larger picture of the insides.keep in mind that the size of the stabs on the back of the bucket will be rated for what the bucket is rated for
if you put a 200A breaker in a 60A bucket with 60A stabs to the buss you will have trouble
as paul said go directly to the buss with bolt on lugs
as you said make sure the capacity is available on the buss and particularly the feeder to the MCC