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Do I need a different V1k filter when I have a 208 or 240 volt power system?

The V1k is sized from a current standpoint and the series inductor is based on a 600 volt power system or less. You can use the V1k on 208 and 240 volt systems by merely sizing the device based on the FLA current rating of the motor just as you would for a 480 volt power system.