DEMA CPM 310 G, User Manual

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General Information
DEMA Role San. ve Tic. A. S. is a secondary protection relays and
accessories manufacturer carrying out its activities in a plant
with 2000 m² closed area in Maltepe, Istanbul, Turkey.
The plant itself inspires creativity and innovation by its high-
tech infrastructure, laboratory-clean environment and the art
collection it hosts.
DEMA Role San. ve Tic. A. S. has manufactured over 100,000
pieces of protection units since its foundation in 1977, and has
great reputation among its clients.
The innovations history of DEMA is as follows:

1977 - R3AS20E: The first DMT electromechanical overcurrent protection relay in the country,

1985 - R1TA112: The first draw out type electromechanical overcurrent protection relay in the country
with IDMT delay,

1990 - R1SA01: The first draw out type electromechanical earth fault protection relay in the country with
DMT delay,

1990 - R1ST04: The first draw out type electromechanical thermal overload protection relay in the country
with thermal image display,

1997 - MCR Series: The first draw out type electronic overcurrent protection relay series in the country
with DMT and IDMT delay,

1997 - MVR Series: The first draw out type electronic over/undervoltage protection relay series in the
country with DMT and IDMT delay,

2000 - IR1021: Double-flashing annunciator relay with
LEDs,

2006 - CPM Series: The first draw out type DSP-based
digital overcurrent protection relay with digital communication
and LCD display features.
DEMA Role San. ve Tic. A. S. invests more than 10% of its total
revenue into R&D projects, which clearly demonstrates DEMA’s
commitment into innovation.
The R&D philosophy of DEMA focuses particularly on user-
friendliness, assurance of high-quality, reliability and
international standards compliance of its products.
A good example on the outcomes of DEMA’s R&D philosophy is
the innovative features of CPM 310 series digital overcurrent
protection relays – a product which introduced the most user-
friendly interface yet by employing the mobile phone navigation
technology into protection relays era.
Some other innovations are as follows:

The most secure secondary shorting mechanism on the
world yet, which enables under-load replaceability of
overcurrent protection units more safely than ever,

Withdrawable unit locking mechanism,

Employment of high-frequency band measurement
transformers in protection relays.