No, Siemens and Square D circuit breakers are entirely different products produced by separate manufacturing giants, and they are completely non-interchangeable. Schneider Electric (Square D) and Siemens design their equipment with entirely different proprietary bus bar thicknesses, physical depths, and mounting clip designs. Forcing a breaker from one brand into the other's panel violates National Electrical Code regulations, creates a loose, high-resistance connection, and poses severe fire hazards.
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