Below are pictures of a really weird Square D breaker. I've got a box full of these things from a panel replacement many years back. The only reason the panel was replaced is because there was no source for these breakers. The panel was probably 3 feet wide, and these breakers bolted on. Not even the local Square D rep was able to identify this breaker. The breaker I took pictures of is a 20 amp, but it's got a lug sized up to #1/0. Weird. The dataplate information off the panel is long gone. All that's left is this box of breakers.