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On Powerpact H, J, or L breakers with interchangeable trip units, can you change the breaker rating by changing the trip unit?

In some cases you can. The breakers need to have either a "T" or "R" before the "U" which indicates they have a field replacable trip unit. The breaker then has Line and Load markings as well.
The H frame is interchangeable between 60, 100 and 150A.
The J frame is 250A only.
The L frame trip units are interchangeable up or down between 250, 400, and 600A.
This is for unit mount breakers only I-Line breakers can not have their trip unit replaced.

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