The earth differential relays range DER3 can be used in alternate current on LV networks for the types of TT and TN. An adequate selectivity is guaranteed with differential protection. All this is possible due to wide adjustment of threshold current dispersion, up until 30A. And also threshold for delay intervention up until for 10 seconds. DER3 Dossena are designed perfectly in accordance with strict regulations with CEI EN 60947-2:2007 annex M ed.8 and IEC 60947-2:2006 annex M ed.4. Thus it satisfies the double need of safety of facility and service continuity on industrial production.
Dosena offers a wide range of earth differential relays that are future-rich with technologies that are easier to use with higher reliability, simple installation and settings, performance and user-friendly design. The greatness and parameters are displayed on large screen dots matrix, very bright that can change colour in relation of state device. Green depicts measurement or surveillance, blue stands for setting and red for alarm and intervention.