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Can a three pole breaker be used on a single phase (two-wire) load in a three phase panel?

Issue:
Product design

Product Line:
Molded Case Circuit Breakers

Environment:  
Square D Circuit Breakers

Cause:
Application

Resolution:
Yes.  According the UL White Book (Product Category DIVQ), multipole common trip circuit breakers rated 125/250V are suitable for use for a single-phase multiwire circuit, with or without the neutral connected to the load.  Courtesy of Mike Holt Enterprises 2008
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