No, you cannot physically or safely put a Square D QO breaker into a Homeline panel. QO breakers are built with a compact 3/4-inch design and distinct mounting clips, whereas Homeline panels are engineered exclusively for standard 1-inch Homeline breakers. Forcing incompatible breakers together creates loose electrical connections, severe arcing risks, potential fire hazards, and immediate code violations. Always match the correct breaker series to your specific panel design.
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