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Can duplex breakers be used for 240V?

Eaton's duplex breakers can not be used for 240 volt applications. The reason for this is since a duplex breaker uses only one space, it is only using one phase of power. Therefore it only has a potential of 120 volts. 

For Eaton's selection of duplex breakers and all resedital load center offerings please see our Catalog Volume 1 Tab 1