No, a Square D circuit breaker (whether QO or Homeline) will not fit or function safely in a Siemens electrical panel. 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 Square D breaker into a Siemens panel violates National Electrical Code regulations, creates a loose and high-resistance connection, poses severe fire hazards, and voids warranties.
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