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Contact SupplierVPIS with Relay is a device which is used to detect that the phase voltage has dropped to a level, safe enough to work with.
It is designed to work along with the VPI system. Hence, it has been packaged with the VPI. The relay is kept active till any of the phases is present above the threshold level, recommended by the customer OR as per IEC requirements. It requires additional 24VDC supply for operating the relay coil.