What are the internal meter consumption (burden) specification ION8650 socket meter.

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The Power Supply, auxiliary power - blade - powered burden = Typical: 3 W, 6 VA/phase, 3-phase operation; Maximum: 4 W, 11 VA/phase, 3-phase operation
The Power Supply, auxiliary power - standard voltage burden = Typical: 7 W, 14 VA; Maximum: 11 W, 18 VA
The Power Supply, auxiliary power - High voltage burden = Typical: 8 W, 14 VA; Maximum: 11 W, 19 VA

The information regarding the internal meter consumption specification is available on the product Installation guide. Please check the link below, on pages 26 and 27.
http://download.schneider-electric.com/files?p_File_Id=27573907&p_File_Name=70001-0304-00.pdf