Not quite understanding the need for the dissertation or all the speculation. I simply was letting Jraef know that there is at least one manufacturer that does make a 400AF draw out breaker.
Carry on......................
There is no more dicertaion or spectulation about draw outs as expounded upon a simple 400a with a 300a trip. As long as there a speculation aboit drawouts I simply took it a step farther indicating that a basic 400a frame with a 300at does have an option to be installed in a moving and stationary draw out frame assembly, that it also has a plug on option. These are just as possible as a draw out air circuit breaker, draw out insulated and power breaker.
Has there been any determination that the OP actually does have a basic 400a frame molded case breaker with a basic 300at?
Other than to speculate have you figured out what the OP was referring to yet?
Having a one line with spec would clarify it. What does the spec say an and the one line show? But there is none.