Hey, everybody. Good to have a chance to visit again. Hope everyone is well.

I recently saw a small (16 ckt?) 3 phase (208/120) Challenger panel that looked like it had breaker blanks in position 1,3,5.
Upon removal of the dead front, the "breaker blanks" were actually what appeared to be a 3 pole breaker, with no handles. This is where the feeder connected to this panel.
In other words it was a main lug panel without conventional lugs, but a molded case connection block that appeared to be a breaker without a handle.
Anyone ever see this?

Thanks.