What purpose does the Input Selector on the Symmetra RM serve?

The input voltage selector for North American applications of the Symmetra RM 6kVA and 12kVA unit must be set for the 200/208/240 (Ph-Ph-Gnd); this is the "down" setting. This setting corresponds to two phase wires and a ground wire, the requirement for Symmetra RM. The 200/208/240 volt position is the default setting and should not be changed for typical North American deployments. If the input voltage selector position is changed to the international setting, this could potentially cause damage to the load.  Changing this selector not only affects the output voltage choices that the Symmetra RM will offer, but the backfeed protection as well.

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