The primary differences between Square D QO and Homeline lie in their engineering grade, physical size, and target market. QO is Square D's premium commercial-grade tier, featuring a compact 3/4-inch format, heavier-gauge steel enclosure, visual trip indicators, and lifetime warranties. Homeline is their residential budget-friendly tier, utilizing a standard 1-inch format and gray enclosures. While QO is built for heavy-duty commercial demands, Homeline is optimized for economical residential installations.
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