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