رله DOSSENA مدل 9DER4/0D

The DER4 series consists of a wide range of devices
for the detection of differential current. They are
available in a modular version (2Din, 3Din) and in a
front panel version (96x96x51mm). The range offered is complete
and full of functions. It includes both more basic and more
advanced devices, equipped with an LCD screen that changes color for each
operating state.
All active conductors, with the exception of the
earth cable, must pass as centrally as possible in a
current transducer with electromagnetic properties
which acts as a sensor in the field.
If the system works correctly, the sum of
all the incoming and outgoing currents is zero.
In the presence of a fault current (IΔ) a current difference is created which is detected by the MRCD (differential relay) and, depending on the programmed settings, activates an external coil which opens the switch, making the system safe

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رله DOSSENA مدل 9DER4/0D