Differential protection relay DER4F/2D

earth-leakagecurrent2 NO/NC

DER4F/2D - 2 thresholds - 3 Din modules The residual current relays of the DER4F 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 30 seconds). The DER4F Dossena are perfectly compliant with the strict regulations in force (CEI EN 60947-2:2019) thus satisfying a double need: the safety of the system and the continuity of the service. Dossena offers a complete range of differential relays rich in functions. Technical features: - Type F - Compliance with product standard CEI-EN 60947-2 - 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 30s. - 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) + 1 alarm threshold (ALARM) - 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 -- option: RS485 Modbus Standard RTU serial output (only version with code 9DER4F/2DRS485 and code 9DER4F/2DCCRS485)