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What is the ``AB`` suffix on the end of the catalog number on a circuit breaker such as PGL36080U31AAB?

What does the suffix "AB" indicate at the end of a Powerpact breaker part number?  

Product line:  
Molded Case Circuit Breakers

Powerpact H, J, L, M, P and R Circuit Breakers

The ``AB`` suffix on a PGL36080U31A stands for a 2A/2B auxiliary switch factory installed on the breaker.
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