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What is the purpose of the PXMP-CSXXX blue LED sensor?

The blue LED is used to visually indicate the correct wiring of the meter module current input to the current sensor/phase conductor.  
An electronic toggle is available in the PXMP Configuration Software to toggle the current sensor/interface module LED ON (blue) and flash the green and red LED of the meter module.  This allows the user to confirm that the sensor with the blue LED is connected to the correct meter module current input.  
This exclusive Eaton feature allows for visual confirmation of correct sensor wiring during commissioning.