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which are line and load sides of the neutral CT used on RG frame LSIG breakers.

Line side for the primary side of the sensor where the system neutral buss connects is white polarity dot on side of breaker, right in the middle. white polarity dot for secondary side of sensor for connection to breaker is polarity dot in corner of sensor next to threaded stud. direction of current flow in neutral buss must be toward the primary side polarity dot.