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What is a "U" suffix on a breaker, such as QBP32250U?

What does suffix U indicate on a Q frame breaker?

Product Line: 
Circuit breakers

Powerpact Q frame Circuit Breakers

The QBP32250U is an internal part number and cannot be ordered. If can appear on a breaker label only by a plant error.  The actual breaker part number should be on the nameplate
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