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QO and QOT tandem circuit breakers: What is the difference?

The former is to be used on non-CTL load center applications, that is those older, obsolete load centers manufactured prior to the NEC requirement dictating that a load center be specifically rated to accept tandem circuit breakers. The latter is to be applied on current style QO load centers. The QOT has a rejection tab on the mounting end of the Breaker

CTA-ID : 2014812
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