Earth-leakage protection relay DER4/0D

1 NO/NCthree-phaseAC

The residual current relays of the DER4 Dossena range can be used on LV networks in alternating current of the TT and TN type. They make it possible to achieve adequate selectivity and residual current protection thanks to the wide regulation of the leakage current threshold (up to 30A) and of the trip delay threshold (up to 5s). The DER4 Dossena are perfectly compliant with the strict regulations in force (CEI EN 60947-2019) thus satisfying a double need: the safety of the system and the continuity of the service. Technical features: - Type A - Compliance with product standard CEI-EN 60947-2:2019 - Power supply 115/230/400Vac or 24÷60Vdc - Threshold adjustment of the rated differential tripping current I∆n from 0.03÷30A - Tripping delay adjustment settable from instantaneous to 5s. - Measurement of the differential current in TRMS - 1 intervention threshold (Trip) - Output 1 NO-C-NC exchange contacts (NO 250Vac 5A P.F.1 / 30Vdc 5A - NC 250Vac 3A P.F.1 / 30Vdc 3A) - Diagnostics on the connection and operation of the opening coil - Diagnostics on connections, continuity of the toroidal transducer windings - Internal self-diagnostics, processor overtemperature control and correct functioning of the electronic circuitry