"Square D" is the overarching brand name, while Homeline is Square D's residential, budget-friendly product tier, and QO is their premium commercial-grade tier. Homeline load centers and breakers feature standard 1-inch wide spacing and gray enclosures intended for standard residential homes. In contrast, the QO line utilizes a compact 3/4-inch format, heavier-gauge steel construction, visual trip indicators, and superior engineering built for heavy-duty commercial and high-end residential applications.
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