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The undervoltage relays series DUH are intended for the protection against the voltage drop of d.c. auxiliary circuits. They can be employed in electric switchgears, sub-stations and plants where the service continuity is of primary importance.
The monitored voltage provides the supply to the internal circuits of the relay: therefore it does not require any other auxiliary supply. An energy storage circuit, internal to the relay, assures a correct performance in case of loss of the supply voltage.