The two primary and distinct lines of circuit breakers manufactured by Square D for residential and commercial electrical applications are QO and Homeline. QO breakers are premium, industrial-grade devices featuring a compact 3/4-inch width, heavy-duty internal mechanisms, and signature visual trip indicator windows. Homeline breakers are standard residential consumer devices built in a conventional 1-inch wide format. Each series is engineered exclusively for its corresponding panel type and cannot be interchanged.
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