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On our Micrologic trip unit replacement document (48049-559-01), we ask for the breaker to be tested while in the closed position and in the open position, why was a test in the open position required?

It checks for missing or bent over pins in the performer plug. By rechecking with the breaker open, you check to make sure the Ground pin in the performer is not damaged. Checking in the closed position checks the sensor plug and in the open checks the GND in the performer.

CTA-ID : 2031909
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