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Why can a QOB2150VH be installed in a 3 phase panels when a QO2150VH cannot?

The QO2150VH has 4 bus connections on the bottom. If used in a 3 phase panel the breaker will cause a phase to phase short. The QOB2150VH has 2 phase connections and will not cause this situation.

CTA-ID : 2018350
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