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What is the difference between QOU and QOU-H breakers? <br />

The QOU-H are 2-pole 15A to 30A breakers rated at 240Vac, and can be applied on 240V 3PH3W systems or the high leg of a 240/120Vac 3PH4W system.
QOU 2-pole breakers are rated at 120/240Vac, and are not suitable for the above applications.

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