Earth-leakage protection relay DER4/1D

current2 NO/NCthree-phase

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 differential protection thanks to the wide regulation of the leakage current threshold (up to 30A) and of the trip delay threshold (up to 30 seconds). The Dossena DER4s are fully compliant with the strict regulations in force (CEI EN 60947-2:2019) thus satisfying a double need: system safety and service continuity. Dossena offers a complete range of differential relays rich in functions. New technology, ease of use, great reliability, ease of installation and setup, performance and "user friendly" design. Technical features: - Type A - Compliance with product standard CEI-EN 60947-2:2019 - Power supply 48÷400Vac or 24÷230Vdc - Threshold adjustment of the rated differential tripping current I∆n from 0.03÷30A - Tripping delay adjustment settable from instantaneous to 30 sec. - Measurement and display of the differential current in TRMS - Visualization with multicolour graphic display (Green=Vigilance, Blue=Programming, Red=Alarm/Trip) - 1 intervention threshold (Trip) - Output 2 NO-C-NC changeover contacts (NA 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