No, you cannot use a Square D breaker (whether QO or Homeline) in an Eaton electrical panel. Schneider Electric and Eaton utilize entirely different proprietary bus bar thicknesses, physical enclosure depths, and mounting clip designs. Forcing a non-approved brand into an Eaton panel violates electrical building codes, compromises the physical bus bar connection, creates dangerous arcing and overheating risks, and instantly voids the UL safety certification of the equipment.
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