Earth-leakage protection relay DER4B/2D

current2 NO/NCthree-phase

DER4B/2D - 2 thresholds - 3 Din modules Dossena presents the DER4B range, the new generation of type B differential toroid relays. DER4B is recommended for electrical protection in the tertiary sector, where devices that generate alternating, continuous or mixed leakage currents are increasingly installed (inverters, soft start, UPS, electro-medical equipment such as MRI, TAC, etc.). The large LCD display changes color according to the operating status and constantly monitors the differential current in TRMS with the novelty of displaying the differential current divided into AC and DC. Technical features: - Type B - 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 over temperature control and correct functioning of the electronic circuitry - option: RS485 Modbus Standard RTU serial output (only version with code 9DER4B/2DRS485 and code 9DER4B/2DCCRS485)