No, you cannot legally or safely use Square D circuit breakers (neither QO nor Homeline series) inside a Siemens electrical panel box. Schneider Electric and Siemens design their load centers with entirely different proprietary bus bar thicknesses, physical enclosure depths, and mounting clip geometries. Forcing an incompatible brand into a Siemens panel violates National Electrical Code regulations, creates a loose, high-resistance connection, poses severe fire hazards, and voids warranties.
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