DELTA - residual current relays

The DELTA range of modular and built-in residual current relays, in combination with the Del and Del A toroidal transformers (openable), aims to protect people and goods, while ensuring the continuity of service of the systems. The main features are:

PERMANENT CONNECTION CHECK An important feature of the DELTA series is the permanent control of the connection circuit between the differential relay and the toroid. When any anomaly is detected in the connection between the toroid and the relay, the protection intervenes automatically, without having to wait for the periodic check to be carried out with the test button.

ΔT ADJUSTMENT OF THE TRIP TIME The adjustment of the tripping time Δt makes this series the ideal solution for creating selective protection systems; the IΔn current regulation allows people and goods to be protected against unwanted or dangerous dispersions. 

VERSION WITH HARMONIC COMPONENTS FILTER With the evolution of system requirements and the introduction of devices equipped with power electronics in systems, the F models were created, with harmonic component filter for heavily disturbed systems.