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Can the trip unit be replaced on electronic trip breaker with a Micrologic Series B trip unit?

Issue:  
Series B Micrologic trip unit on older breaker needs to be replaced.

Product Line:  
Legacy Series Electronic Trip breakers with Series B Micrologic trip units.

Environment:  
This applies to all Series B Micrologic trip units except those installed in SEF/D breakers.

Resolution:  
Series B Micrologic trip units installed in the legacy L, M, N and P breakers are not replaceable.  Only Series B trip units installed in SEF/D breakers can be replaced; Series B trip units CANNOT be installed to replace older trip unit series in SEF/D breakers.  All of these breakers are now obsolete and need to be replaced with PowerPact electronic trip breakers.  

Unless ordered as a field interchangeable trip unit breaker (with a "T" in the part number), the PowerPact H, J and L frame's trip units are not replaceable.  However, the I-Line H, J and L frames cannot be ordered with field interchangeable trip units.  PowerPact M trip units and PowerPact P and R frames with the Basic ET1.0I trip units are also not replaceable.  

PowerPact P, R and Masterpact NT, NW trip units are replaceable.  
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