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What does the MB mean on an LAF36400MB?

Issue:
What is the MB suffix referring to on a legacy L-frame breaker?
 
Product Line:
Thermal Magnetic Molded Case Circuit Breakers
 
Environment:
Legacy L-frame Breakers
 
Cause:

What is the MB suffix referring to on a legacy L-frame breaker?
 
Resolution:
 

It has a shorter handle. When used as a main breaker, the shorter handle is required for the door of the panel to still be able to close.
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