No, you cannot use a Square D QO breaker in a Homeline panel. QO breakers are built with a compact 3/4-inch wide format and unique mounting clips, whereas Homeline panels are engineered exclusively for standard 1-inch wide Homeline breakers. Attempting to force or install a QO breaker into a Homeline load center creates loose electrical connections, severe arc-fault and fire risks, potential short circuits, and immediate code violations that void manufacturer certifications.
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