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How does a GVAU module work?

Issue:
How is voltage connected to the GVAU and how does it work?

Product Line:
IEC Contactors and Starters

Environment:
GV Manual Starters and Protectors

Resolution:
Need to run 2 wires from the 2 legs of the main device to the coil of the GVAU. Once the GVAU senses that the voltage is less than module's specified voltage it will trip and the main device will trip also.
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