The undervoltage relays series DUS, are intended for the protection against the voltage drop of DC auxiliary circuits. They can be employed in electric switchgears, substations and plants where the service continuity is of primary importance.
The relays DUS are designed in accordance with the standard ENEL LV80 (reference 80/4). They comprise two operation thresholds with independent time delay, with individual settings. They require an auxiliary voltage, to properly perform their function.