I.B. 17555C
Effective November 1999
Page 2
1-1.1 WARRANTY AND LIABILITY INFORMATION
NO WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING WARRANTIES OF FITNESS FOR A PAR-
TICULAR PURPOSE OF MERCHANTABILITY, OR
WARRANTIES ARISING FROM COURSE OF DEALING
OR USAGE OF TRADE, ARE MADE REGARDING THE
INFORMATION, RECOMMENDATIONS AND DESCRIP-
TIONS CONTAINED HEREIN. In no event will Cutler-
Hammer be responsible to the purchaser or user in con-
tract, in tort (including negligence), strict liability or other-
wise for any special, indirect, incidental or consequential
damage or loss whatsoever, including but not limited to
damage or loss of use of equipment, plant or power sys-
tem, cost of capital, loss of power, additional expenses in
the use of existing power facilities, or claims against the
purchaser or user by its customers resulting from the use
of the information and descriptions contained herein.
1-1.2 SAFETY PRECAUTIONS
All safety codes, safety standards and/or regulations
must be strictly observed in the installation, operation
and maintenance of this device.
WARNING
THE WARNINGS AND CAUTIONS INCLUDED AS
PART OF THE PROCEDURAL STEPS IN THIS DOCU-
MENT ARE FOR PERSONNEL SAFETY AND
PROTECTION OF EQUIPMENT FROM DAMAGE. AN
EXAMPLE OF A TYPICAL WARNING LABEL HEAD-
ING IS SHOWN ABOVE TO FAMILIARIZE
PERSONNEL WITH THE STYLE OF PRESENTATION.
THIS WILL HELP TO INSURE THAT PERSONNEL ARE
ALERT TO WARNINGS, WHICH MAY APPEAR
THROUGHOUT THE DOCUMENT. IN ADDITION, CAU-
TIONS ARE ALL UPPER CASE AND BOLDFACE.
CAUTION
COMPLETELY READ AND UNDERSTAND THE MATE-
RIAL PRESENTED IN THIS DOCUMENT BEFORE
ATIEMPTING INSTALLATION, OPERATION OR APPLI-
CATION OF THE EQUIPMENT. IN ADDITION, ONLY
QUALIFIED PERSONS SHOULD BE PERMITTED TO
PERFORM ANY WORK ASSOCIATED WITH THE
EQUIPMENT. ANY WIRING INSTRUCTIONS PRE-
SENTED IN THIS DOCUMENT MUST BE FOLLOWED
PRECISELY. FAILURE TO DO SO COULD CAUSE
PERMANENT EQUIPMENT DAMAGE.
1-2 GENERAL INFORMATION
The Digitrip 3000 Protective Relays panel mounted multi-
function, microprocessor based overcurrent relays,
designed for both ANSI and IEC applications (Figures 1-1
and 1-2). It is a self-contained device which operates
from either AC or DC control power (DC only for the
DT3030 & DT3031), and provides true RMS sensing of
each phase and ground current. Only one relay is
required per three-phase circuit. Current monitoring and
operator selectable protective functions are integral to
each device.
Fig. 1-1 Digitrip 3000 Protective Relay (Front View)
CAUTION
THE LOSS OF CONTROL VOLTAGE WILL CAUSE THE
DIGITRIP 3000 TO BE INOPERATIVE. IF AC CONTROL
VOLTAGE IS USED, AN APPROPRIATE RELIABLE
POWER SOURCE/SCHEME SHOULD BE SELECTED
(POSSIBLY A UPS SYSTEM) TO SUPPLY POWER TO
THE RELAY.
The Digitrip 3000 Protective Relay provides protection for
most types of medium voltage electrical power distribu-
tion systems. It was designed for use with Cutler-Ham-
mer Type VCP-W vacuum circuit breakers, as well as
other manufacturers’ medium and high voltage circuit
breakers. Digitrip 3000 Protective Relays are compatible
for use with all circuit breakers utilizing a shunt trip coil.
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