Identifying a Square D QO circuit breaker is straightforward due to its distinctive physical characteristics: QO breakers feature a compact 3/4-inch width (narrower than standard 1-inch breakers), a signature visual trip indicator window (usually showing a bright red or white flag when tripped), and the prominent "QO" logo stamped directly onto the housing or toggle handle. They also utilize a specialized spring-loaded mounting clip that snaps securely onto QO load center bus bars.
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