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Introduction
In this technical manual, the protection functions of the DEMA 400 series relays and their
application methods are given.
The manual provides control of the device connection and energization of the device,
parameter settings and configuration procedures according to the field requirements.
General Characteristics of 400 Series Relays
The DEMA 400 Series is a series of multifunctional modern digital protection relays with
voltage, overcurrent, directional overcurrent and motor protection versions. Electronic,
physical and functional structure, technology and standards represent the last point; It
provides all users with an important option for modern secondary protection systems with the
convenience and advantages they provide in installation, commissioning and operation.
DEMA 400 Series Digital Overcurrent Protection Relays have successfully completed all type
tests in the internationally accredited test labs, which are required by the relevant articles of
IEC 60255, IEC 60529, IEC 60695, IEC 60068 and IEC 61850 standards, ISO 9001: 2008
quality assurance system under the guarantee of users.
The 400 Series relays, which began production in 2017, show their high performance in many
applications; It is still successfully used in many areas including organized industrial zones,
medium and large production facilities, transmission and distribution centers.
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