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What is meant by common trip as it relates to a 2 or 3 pole breaker?

FA112337

17/05/2018

Issue:
Does a handle switch trip both breakers?
 
Product Line:
Miniature Circuit Breaker
 
Environment:
QO Circuit Breaker
 
Resolution:
This means the 2 or 3 poles are linked internally and if any pole trips, they all open together
Single pole breakers linked externally with a handle tie are not common trip. One breaker (pole) tripping does not trip the others.