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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?

How do I know if I can replace the trip unit in my H, J, or L frame breaker?  

Product line:  
Molded case circuit breakers

Powerpact H, J, and L frame circuit breakers

Need to change the amp rating of circuit breaker

In some cases you can.  The breaker needs to have either a "T" or "R" before the "U" which indicates they have a field replaceable trip unit.  The breaker also will have Line and Load markings.

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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