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What is the difference between a QO and QOU breaker?

Issue:
Difference of QOU vs. QO?

Product Line:
Circuit Breaker 

Environment: 
QO and QOU Circuit Breaker 

Resolution:
Both are molded case breakers. Both provide overload protection or short circuit protection.
QOU is a din-rail or unit-mounted type and the QO is a plug-on type .
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