• 2 built-in intervention thresholds
  96x96mm

The differential relays of the DER3F Dossena range can be used on TT and TN type LV alternating current networks.

They allow adequate selectivity and differential protection to be achieved thanks to the wide adjustment of the leakage current threshold (0.03÷30A) and the trip delay threshold (up to 15 sec).

The Dossena DER3Fs are perfectly compliant with the strict regulations in force (IEC 60947-2:2019), thus satisfying a dual need: the safety of the system and the continuity of service.

Dossena offers a complete and feature-rich range of differential relays.

New technology, ease of use, great reliability, ease of installation and setup, performance and "user friendly" design.

Quantities and parameters are displayed on a large, very bright dot matrix display which changes color in relation to the operating status of the instrument (Green=measurement/monitoring, Blue=programming, Red=alarm/intervention).

Features

• type F
• 2 intervention thresholds + alarm
• opening coil control
• self-diagnostics on display
• display
• 2 NO-C-NC contacts
• intervention delay 15 seconds
• option: RS485 Modbus Standard RTU serial output