The DER3 series differential relays with separate toroids can be used on TT and TN-type LV alternating networks.
They allow adequate selectivity and differential protection to be achieved thanks to the wide adjustment of the leakage current threshold (30mA÷30A) and the trip delay threshold (instantaneous÷15 seconds).
The DER3s comply with the strict regulations in force (IEC 60947-2:2019), thus satisfying a dual need: the safety of the system and the continuity of the service.
Dossena offers a complete and feature-rich range of differential relays.
New technology, ease of use, great reliability, ease of installation and programming, performance and "user-friendly" design.
The quantities and parameters are displayed on a large, very bright dot matrix display which changes color about the operating status of the instrument (Green=measurement/monitoring, Blue=programming, Red=alarm/intervention).
Features
- A/AC type
- 2 intervention thresholds (Trip + alarm) with 2 output contacts (NO-C-NC)
- continuous control of the correct functioning of the opening coil
- continuous control of the correct functioning of the D series toroidal transducer
- self-diagnostics with description of the problem on the display
- backup capacitor for signaling the intervention even in the absence of auxiliary voltage
- option: RS485 Modbus Standard RTU serial output (only version with code 9DER3/2IMRS485 and code 9DER3/2IMCCRS485)
