Eaton Digitrip RMS 310 User manual

Instructionsfor the Digitrip RMS 310 3 - Pole and 4 - PoleTrip Unit Installation
and Operationwith L
- Frame and MDL - FrameSeries C Circuit Breakers
Table of Contents
Description Page
1 .O GeneralInformation ............................................... 1
1.1
Protection .............................................................. 1
2.0
UL Listed Devices .................................................. 2
3.0
Installation ............................................................. 2
3.1
Preparation(AllTrip Units) ..................................... 2
3.2
4 - PoleTrip Unit Installation ..................................... 2
3.3
Ground FaultTrip Unit Installation .......................... 3
3.3.1
General .................................................................. 3
3.3.2
Installation ............................................................. 3
3.4
3.5
4.0
4.1
4.2
4.3
4.4
5.0
5.1
5.2
5.3
5.4
5.5
5.6
6.0
6.1
6.2
3 - Pole (Non - Ground Fault)Trip Unit Installation ..... 5
Final InstallationInstructions(AllTrip Units) ........... 6
Principleof Operation ............................................ 6
General .................................................................. 7
OverloadTrip ......................................................... 7
Short Delay/lnstantaneousTrip .............................. 7
Ground FaultProtection ......................................... 7
ProtectionSettings ................................................. 7
General .................................................................. 7
Short Delay Pick - upSettings ................................. 7
Short DelayTime Settings ..................................... 7
InstantaneousPickupSetting ................................ 7
Ground FaultPick - upSetting ................................. 7
Ground FaultTime Settings ................................... 8
Testing ................................................................... 8
FunctionalFieldTesting ......................................... 8
PerformanceTesting for Ground FaultTrip Units .... 8
-
6.2.1 Code Requirements ............................................... 8
6.2.2
StandardsRequirements ....................................... 9
6.2.3 GeneralTest Instructions ....................................... 9
7.0 RatingPlug .......................................................... 12
8.0
References .......................................................... 12
8.1
Series C L - FrameMoldedCase
Circuit Breakers
................................................... 12
8.2
InternalAccessories ............................................ 12
PRESENT BEFORE PROCEEDINGWITHTHETASK,
AND ALWAYS FOLLOW GENERALLY ACCEPTED
SAFETY PROCEDURES.
MISAPPLICATION
OR MISINSTALLATION OFITS
PRODUCTS.
CUTLER
- HAMMER IS NOT LIABLE FORTHE
The user iscautionedto observe all recommendations,
warnings,and cautions relatingto the safety of personnel
and equipment as well as all general and local healthand
safety laws,codes, and procedures.
The recommendationsand informationcontained herein
are basedon Cutler
- Hammerexperienceandjudgement,
but should not beconsideredto be all
- inclusiveor cover -
ing everyapplication or circumstancewhich may arise. If
any questionsarise, contact Cutler
- Hammerfor further
informationor instructions.
Fig. 1 DigitripRMS 310 Trip Unit for 3 - PoleL - Frame &
MDL Frame Series C CircuitBreaker
1 .O GENERAL INFORMATION
A
A WARNING
DEATH,SEVERE PERSONAL INJURY, OR
SUBSTANTIAL PROPERTY DAMAGE CAN RESULT
FROM CONTACTWITH ENERGIZED EQUIPMENT. DO
NOT ATTEMPT INSTALL
OR PERFORM
MAINTENANCE ON EQUIPMENTWHILE IT
IS
ENERGIZED.ALWAYS VERIFY THAT NOVOLTAGE IS
1.1 Protection
The Digitrip RMS 31 0, illustratedin Figure 1, is an elec -
tronic trip unit that incorporatesa microprocessor - based
custom applicationspecific integratedcircuit design for
usewith Series C L
- Frameand MDL FrameMolded Case
Circuit Breakers.
The Digitrip RMS
310 providestrue RMScurrent sensing
for propercorrelation with thermal characteristicsof
conductorsandequipment.Interchangeableratingplugs
Effective March 2003 Supersedes I.L. 29C615D dated July 1998 EATON
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Page 2
are providedto establishthe continuouscurrent ratingof
each circuit breaker.
The DigitripRMS310Trip Unit is completely self
- con -
tained and when the circuit breaker is closed, requiresno
external powerto operate its protectionsystems. It
operatesfrom current signal levelsand control power
derivedthrough current sensors integrally mounted inthe
trip unit.
Digitrip
RMS 31 0 Trip Unitsare suitablefor 50/60 Hz AC
applicationsonly. For DC applications,athermal
- magnetic
trip unit shouldbe used.
The Digitrip RMS310Trip Unit is available in 4 different
types, (seeTable 1
- 1).Eachtrip unit contains a fixed long
delay time function (adjustedby changingthe ratingplug),
and may be equippedwith a maximumof two phaseand
two ground (time
- current)adjustmentsto meet specific
application requirements.The types of adjustments
available for each model includethe following:
Adjustment
1) Short Delay Pick - up
2) Short Delay Pick-up/Short DelayTime
3) Short Delay Pick-up/GroundFault
Pick-up/GroundFaultTime
4) Short Delay Pick-up/Short DelayTime
Ground Fault Pick-up/Ground
FaultTime
Tm
LESxxxLS,-LSE,-LSP
or MESxxxLS
or MESxxxLSl
LESxxxLSG,
or MESxxxLSG
LESxxxLS I G
or MESxxxLSlG
LESXXXLS I, - LS I E, - LS I P
2.0 UL LISTEDDEVICES
The Digitrip
RMS 310Trip Unit is listed in accordancewith
UnderwritersLaboratories,Inc.Standard UL489,under
File E7819and satisfies the applicable requirementsof
the InternationalElectrotechnicalCommission(IEC)
recommendationsfor moldedcase circuit breakers.
KPlaces)\
Screw
L Secondary
Winding
Connector
Fig. 2 PreliminaryAlignment of TripUnitand Current
Sensor
3 .O INSTALLATlON
3.1 Preparation(AllTrip Units)
The installationprocedureconsistsof inspectingand
installingthe trip unit and rating plug.To installthe trip
unit,performthe followingsteps.
Note:If required,internalaccessory installation
should be done beforethe circuit breaker is mounted
and connected.Refer to individualaccessory instruc
-
tion leaflets.
Makesure that the trip unit is suitable for the intended
installationby comparing nameplatedatawith any
existingequipmentand system requirements.Inspectthe
trip unit for completeness,and check for damage before
installingit inthe circuit breaker frame.
Note:Trip unit center retainingscrew is captive inthe
trip unit conductor;the remaining retaining screws (2
for a 3
- pole trip unit,3 for a 4 - pole trip unit) are
suppliedwith the frame.
Removecircuitbreakerpan
- headcoverscrews,andcover.
To continue installation,proceedto the section applicable
to the trip unit being installed:
Trip UnitTvpe Section
4
- poleTypeTrip Unit 3.2
3.3
3.4
3
- pole Ground FaultTrip Unit
3
- pole Non - Ground FaultTrip Unit
3.24-PoleTrip Unit Installation
Removethe three screwsfor the left
- and right - pole and
fourth pole contact bases (Fig.3) from the hardwarebag.
Placethe trip unit and fourth pole current sensor side by
side on aflat surface. (See Fig.2)
Removethe CAUTION tag from the current sensor
secondarywinding leads.
Note:Secondarywinding connector is not polarized.
Plugthe current sensor secondary winding connector into
the receptaclein the side of the trip unit. Either polarity is
acceptable.
Note:Thetwo trip unit outer retainingscrewsand
fourth polesensor retainingscrew may be placed in
the trip unit conductor holesat this time. If preferred,
the 5/16 inch hexagonal
- headwrench may be usedto
positionthe screws when the trip unit is inthe base.
Positiontrip unit and fourth pole currentsensor in base.
Makesure latchbracket pin is properly seated in slots in
side plates (see Fig.4). If necessary, push circuit breaker
handletowardsthe closed positionto helpseat trip unit.
Effective March 2003
I.L. 29C615E
Trip Unit
Current
Retaining
Sensor
Retaining
Screw
Courtesy of NationalSwitchgear.com

Page 3
- Contact
Base
- Load
Copper
Fig. 3 ContactBasesand Load Copper
LINE END
Side
Plate
Trigger
Trip
Unit and
Current
Sensor
Retaining
Screws
Fourth
Unit LOAD
END
.Pole
Current
Sensor
Fig. 4 TripUnitInstalled in CircuitBreaker
a CAUTION
DO NOT EXCEEDATORQUE OF 12 LB-FT
(16.27 N.M). EXCESSIVETORQUINGWILL SHEAR
SCREWS.
FAILURE TO APPLY THE REQUIREDTORQUE MAY
LEAD TO EXCESSIVEHEATING AND CAUSE
NUISANCETRIPPING OFTHE CIRCUIT BREAKER.
Screw in and tighten three trip unit retainingscrews
(centerfirst) and the screw for the fourth polecurrent
sensor.Torqueto 12 Ib - ft (16.27 N.m) (see Fig.4).
Finishinstallationof the 4
- poleTrip Unit by followingthe
instructionsin Section3.5.
3.3 Ground FaultTrip Unit Installation
3.3.1 General
Groundfault trip unitsare suppliedfrom the factorywith a
wire harnesswith pigtail leadconnectionsfor a neutral
current sensor (white and grey wires) and a groundfault
alarm relay (yellow and greenwires).A neutralcurrent
sensor is providedwith eachtrip unit, and the groundfault
alarm relay is orderedand shipped separately if required.
If the alarm relay is not required,the green and yellow
leads should be cut off beforethe trip unit is installedin
the breaker.
Digitrip
RMS 31 0 Ground FaultTrip Unitsdetect ground
fault currentsthrough ResidualSensing.They are not
designedto use source ground or zero sequenceground
fault sensingmethods.Ifthe system neutralis grounded,
but no phaseto neutralloadsare used,the neutralcurrent
sensor is not necessary.Inthat case, thewhite and grey
leadsonthe trip unit should becut off beforeinstallation.
If the system neutralis groundedandphaseto neutral
loadsare used,thenthe neutralcurrentsensor(seeFig.
5)
must be used.Itshould beconnectedto the breaker
accordingtothe diagramin Fig.6.It hasthesameturns
ratioasthe phasecurrent sensorsinthe trip unit.
Note:The polarityof the sensor connections is
critical.Always observethe polarity markingson the
installationdrawings.The polaritymarkingsare
identifiedas white dots on the transformer.Toinsure
correct groundfault equipment performance,conduct
field tests to comply with National Electric Code
requirementsunder article230-95(C). See Section 6.2
for testing instructions.
The optional“Internal Accessories” listed in Section8.2
are availablefor installationin a Digitrip
RMS 31 0 Ground
FaultTrip Unit.Theseitems, if required,must be ordered
separately.
3.3.2 Installation
Plugthe wire harness suppliedfor the neutralcurrent
sensor and ground fault alarm relay (white, grey, yellow
and greenwires) into the connector located in the right
pole of the trip unit.With the correct polaritythe harness
should snap into place. Do not force the harness intothe
connectorwith the wrong polarity.
Removetrip unit outer pole screws and red plastic
washersfrom the breakerframe. Discard red plastic
washers (fig.7). For the MDL
- frame,also removethe load
end trip unit mountingscrewsfrom the frame
(fig.
7a).
Effective March 2003 EAVN
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Page 4
Fig. 5
SOURCE
LOAD
.Aux~Iiary switch shown m the " Breaker Canlacis Open'' pmilmn
Fig. 6
- COVER SCREWS
TORQUE 20-22
9
9
-1b
Fig. 7a MDL Trip UnitInstallation
E:VN Effective March 2003
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Page 5
Lefl
Contact
Base
Right
Contact
Base
Fig. 7 Left - andRight - PoleContactBases
Circuit Latch
Breaker
Handle
Side Trip Side
Plate Unit Plate
Retaining
Screws
Positiontrip unit in base. Make sure latch bracket pin is
properly seated in slots in side plates (see Fig.8). If
necessary, move latchtoward loadend of circuit breaker
to seat trip unit.
Screw in and tighten three trip unit retainingscrews
(centerfirst).Torqueto 12 Ib - ft (16.27 N.m) (see Fig.8).
A
A CAUTION
DO NOT EXCEED ATORQUE OF 12LB-FT
(16.27 N.m). EXCESSIVE TORQUING WILL SHEAR
SCREWS.
FAILURETOAPPLYTHE REQUIREDTORQUEMAY
LEADTO EXCESSIVE HEATING AND CAUSE
NUISANCE TRIPPING OFTHE CIRCUIT BREAKER.
For an MDL - frame,also screw in and torque the load end
screwsto 6
- 8 Ib - ft.(8.14 - 10.85 N.m.).
3.4 3 - Pole(Non - Ground Fault) Trip Unit Installation
Removetrip unit outer pole screws and red plastic
washersfrom the breakerframe. Discard red plastic
washers (fig.7). For the MDL
- frame,also removethe load
end trip unit mountingscrewsfrom the frame
(fig.
7a).
Note: The two trip unit outer retainingscrews may be
placed
in thetrip unit conductor holes at this time. If
preferred, the5/16 inchhexagonal
- headwrench may
beused
to positionthe screwswhen the trip unit is in
the base.
Positiontrip unit in base. Make sure latch bracket pin is
properly seated in slots in side plates (see Fig.8). If
necessary, move latchtoward loadend of circuit breaker
to seat trip unit.
Screw in and tighten three trip unit retainingscrews
(centerfirst).Torqueto 12 Ib - ft (16.27 N.m) (see Fig.8).
A CAUTION
Fig. 8 TripUnitInstalled in CircuitBreaker
Note:Thetwo trip unit outer retainingscrews may be
placed
in thetrip unit conductor holes at this time. If
preferred, the5/16 inchhexagonal
- headwrench may
beused
to positionthe screwswhen the trip unit is in
the base.
DO NOT EXCEED ATORQUE OF 12LB-FT
(16.27 n.M). EXCESSIVE TORQUING WILL SHEAR
SCREWS.
FAILURETOAPPLYTHE REQUIRED TORQUEMAY
LEADTO EXCESSIVE HEATING AND CAUSE
NUISANCE TRIPPING OFTHE CIRCUIT BREAKER.
Effective March 2003 EAVN
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Page 6
For an MDL - frame,also screw in and torque the load end
screwsto 6
- 8 Ib - ft.(8.14 - 10.85 N.m.)
3.5 FinalInstallationInstructions (AllTrip Units)
Installaccessory(ies), if required,usingthe appropriate
instructionleaflet listed in Section8.2.Where accessories
are not required,install protectivebarriers suppliedwith
the trip unit inaccessory retainingslots in left
- and right -
hand poles of trip unit and in fourth polecurrent sensor if
applicable.
Makesure interphase barriers and sliding handle barrier
are in place.
Installcircuit breakercovers and pan
- head screws as
shown in Fig.
9.
a CAUTION
THE RATING PLUG MECHANICALLY INTERLOCKS
NIT. IF THE
ReplaceTerm. Cover
.164-32 x
Pan - head
Screw
@ $3
Fourth
untilthe arrow pointsto ENGAGED. If an adjustable rating
plug is used,four continuouscurrent settingsare possible.
Set the switch markedA, B, C, Dto the current rating
desired.
Note:The reverse procedure is usedtoremovethe
rating plug.Turn the Push
- to - Trip buttontothe
remove position. This actionwillcausethecircuit
breaker to trip. Then grasp the lipof the Push
- to - Trip
buttonand gently pull.A smallscrewdriver placed
underthe left edge of the rating plugwillassist in
removal.
Reset circuit breakerby movinghandleto the reset
position.Move handleto the
ON position.Circuit breaker
handleshould remainat the
ON position.
Press Push
- to - Tripbutton (in rating plug) to check manual
tripping of the circuit breaker.
Fig.
9 CoverScrew InstallationPositions
Note: Before attempting to installthe rating plug,the
arrow
in the Push - to - Trip button portionof the plug
must bepointingtoward the REMOVE position.This
can bedonewith asmallscrewdriver.
Installratingplug.Positionthe rating plugas shown in Fig.
10.Insertthe rating plug inthe trip unit.The pinsand
plunger must align correctly with the matching receptacles
and slot in the trip unit.After the rating plug is pressed into
position,depressthe Push
- to - Tripbuttonwith a small
screwdriverand turn it clockwiseone quarter of a turn
However,the trip unit containsthermal temperature
protectivecircuitry that initiatesa trip operationfor self
-
protectionif the internalambienttemperatureatthe
printedcircuit board (PCB) reachesapproximately100°C.
This may occur for open air temperatures above 40°C
with circuit breakercurrents near full load.
Effective March 2003
ambient temperatures over a range of -20º to +55ºC.
The calibration of the trip unit is insensitive to
50°C rise at properly sized and installed terminations.
Trip
Unit
Fig. 10 Installing Rating Plug
In open air at 40ºC, an L-Frame circuit breaker or an
M-Frame circuit breaker with a Digitrip RMS 310 Trip
Unit installed will carry continuously up to 600 amperes
or 800 amperes respectively without exceeding a
4.0PRINCIPLE OFOPERATION
I.L. 29C615E
1.75 Lg.
WITH THE TRIP UNIT. IF THE RATING PLUG IS NOT
CORRECTLY INSTALLED, THE CIRCUIT BREAKER
CANNOT BE RESET OR PLACED IN THE "ON"
POSITION.
Courtesy of NationalSwitchgear.com

Page 7
For ambientconditions above40°C and where the
maximumampere ratingplug has been installed,derating
of the circuit breakerframe should be consideredto avoid
exceedingasafe terminal temperatureoperating range.
ConsultCutler
- Hammerfor recommendations.
4.1 General
The Digitrip RMS31 0 Trip Unit providesatripping signal
to the flux transfershunt trip when current andtime delay
settingsare exceeded.This is accomplished by employing
the Cutler
- Hammercustom designedintegratedcircuit
SpreTMchip,which includesamicrocomputerto perform
its numericand logicfunctions.
Inthe Digitrip RMS31
0 Trip Unit,all requiredsensing and
tripping powerto operate its protectionfunction is derived
from the current sensors inthe circuit breaker.The
secondarycurrents from these sensors providethe
correct input informationfor the protectionfunctions, as
well as tripping power, whenever the circuit breaker is
carrying current.These current signalsdevelop analog
voltagesacrossthe appropriatecalibrating resistors.
The microcomputer,incyclic fashion, repeatedlyscans
the voltagevalues across eachcalibrating resistorand
entersthese values into memory.These data are usedto
calculatetrue RMScurrentvalues, which arethen repeat
-
edly comparedwith the protectionfunction settingsand
other operatingdata stored in the memory.The software
programthen determineswhether to initiateprotection
functions, includingtripping the breaker throughthe flux
transfer shunt trip device inthe circuit breaker.
4.2 OverloadTrip: Inaccordancewith standards require -
ments, the trip unit initiatesatrip of the circuit breaker
within two hoursfor an overloadof 135percent,andwill
trip in less time for higheroverloadcurrents.
A “Thermal Memory”effect preventsthe breakerfrom
being re
- energizedimmediatelyafter an overload. A
“cooling off” periodof upto 5 minutesis required,which
allowstime for cablingto cool off.
4.3 Short Delay InstantaneousTrip: For short circuit
conditionsthat exceedthe short delay pick
- upsettings,
the trip unit initiatesatrip after adelay prescribed by the
I2trampfunction for trip unitswith catalog number suffixes
LS, LSE, LSP, and LSG.
A flat responsetime delay action
is providedby trip unitswith catalog number suffixes LSI,
LSIE, LSIP, and LSlG unlessthe instantaneous
(I) setting
is selected.
4.4 Ground Fault Protection: When selected, ground
fault pick
- up andtime delay settings shown inTable 1 - 2
allow selectiveground fault coordinationwith other circuit
protectiondevices.
Effective March 2003
I.L. 29C615E
CAUTION
5.0 PROTECTION SETTINGS
5.1 General
Prior to placing any circuit breaker in operation, each trip
unit protection setting must be set to the values specified
by the engineer responsible for the installation. The
available settings along with the effect of changing the
settings are illustrated in Figures 12-1 to 12-3.
The installed rating plug establishes the maximum
continuous current rating (I,) of the circuit breaker. Short
delay current settings are defined in multiples of I,.
One to four time and pick-up adjustment settings are
available depending on the particular trip unit purchased.
A rotary switch is provided for each setting. The rotary
switch is adjusted using a small flatblade screwdriver
(Figure 11).
A green status light on the face of the trip unit
indicates the operational status of the trip unit. If
the load current through the circuit breaker exceeds
approximately 20% of the maximum current rating
of the trip unit, the status light will blink on and off
once each second. A blinking status light is an
indication of a properly functioning trip unit. If the
status light is not blinking, the current through the
breakers may be less than 20% of the maximum. If
the current exceeds 20% and the status light is not
blinking, use the STK2 test kit to investigate (see
section 6.1).
MESxxxLSI, and -LSIG, Instantaneous Pickup is achieved
For catalog number LESxxxLSI, -LSIG, -LSIP, -LSIE,
5.4 Instantaneous Pickup Setting
with no intentional delay (Instantaneous).
(see Figure 12-2). The "I" setting gives a trip response
response. Four settings (I, .1, .2, .3 second) are available
MESxxxLSI, and -LSIG, the short time delay is a flat
For catalog number LESxxxLSI,-LSIG, LSIP, -LSIE,
5.3 Short Delay Time Settings
Digitrip RMS 31 0 Trip Units.
shown in Figure 12-1. This feature is included on all
Seven settings are available that range from 2 to 8 (I,) as
5.2 Short Delay Pick-Up Setting
LACK OF ILLUMINATION OF THE STATUS LIGHT
DOES
NOT INDICATE THE TERMINALS OF THE
BREAKER ARE DEENERGIZED.
trip current involved.
configuration with the actual time delay a function of the
For catalog number LESxxxLS,-LSG,-LSP,-LSE,
MESxxxLS and -LSG the short time delay is an I²t ramp
Courtesy of NationalSwitchgear.com

Availableon CatalogNos.
and
5.6 Ground Fault Time Settings
The groundfault time delay is a flat responsewith four
settings
(I,
.15, .3, .5 second) available (Figure 12-3).The
6.1 FunctionalFieldTesting
Atest receptacle is built intoeach trip unitto allow use of
the STK2Test Kit.TheTest Kit performs a test of the Long
Delay, Short Delayand Ground Faultfunctions.
6.2.1 Code Requirements
The National ElectricalCode underArticle 230 - 95 - C
requiresthat any ground
- faultprotectionsystembe
performancetestedwhen first installed.Thetest shall be
conductedin accordance with approved instructions
I
\
I
I\ Remove- I
LTest
Jacks
Fig. 11 Adjustment Switchesand TestPoints
5
3@7
Short Delay Pickup
(Multiples
of Rated Current 1,)
Current
W
+
E
I Ih
1 Ilh 5
Short Delay Pick - up
(Multiples of Rated Cu
Current
irrent)
Fig. 12-1 ShortDelay TripCurrentAdjustment and Curve
Details Fig.
12-2
ShortDelay TripCurrentandShort Delay Trip
Time Adjustment and Curve Details
Effective March 2003
6.2 Performance Testing for Ground Fault Trip Units
I.L. 29C615E
6.0 TESTING
LES3xxxLSG, -LSIG, MES3xxxLSG, and -LSIG
(Instantaneous). This option is available on Catalog Nos.
I setting gives a trip response with no intentional delay
breaker.
matter what rating plug is installed in the circuit
Note: These ampere values are always the same no
values listed on the trip unit nameplate and in Table 1.2.
(see Figure 12-3) and correspond to the fixed ampere
Five settings ranging from 1 through 5 (xlG) are available
5.5 Ground Fault Pick-Up Setting
neous Pickup.
Delay Pickup (see paragraph 5.2) then becomes Instanta-
by setting Short Delay Time to "I" (Instantaneous.) Short
Page 8
300
Courtesy of NationalSwitchgear.com

Page 9
I
’*+
I
L
t
L
Time Ms
Current
Fig. 12 - 3 Ground Fault Trip Current, and Ground Fault Trip
Time Adjustments and Curve Details
providedwith the equipment. A written recordof this test
shall be made and shall be availableto the authority
havinginspectionjurisdiction.
6.2.2 Standards Requirements
As a follow - up to the basic performancerequirements
stipulatedby the
N.E.C. as stated above, ULStandard No.
1053requiresthat certain minimum instructionsmust
accompanyeach ground fault protectionsystem.These
following statements plus a copy of the test recordform
illustratedin Fig.16are shippedwith each Digitrip
RMS
31 0 Trip Unit.
6.2.3 GeneralTest Instructions
The interconnectedsystemshall be evaluated inaccor -
dancewith the equipment assembler’sdetailed instruc -
tions by qualifiedpersonnel.
The polarityof the neutral sensor connections(if used)
must agree with equipment assembler’sdetailedinstruc
-
tionsto avoid improper operations following apparently
correct simulatedtest operations.Where a question
exists, consult the specifyingengineer and/or equipment
assembler.
The grounding pointsof the system shall be verifiedto
determinethat ground pathsdo not exist that would
bypassthe sensors.The use of high
- voltagetesters and
resistancebridges may be used.
.- i
+
300\(!&
8
Rating Plug Setting (Amperes)
2x-Ex 2x-8x 2x.8~2x-Ex
See Fig. 2 - 7 and Fig. 2-8 for
Continuation of Short Time
Instantaneous Portions of Curves
Current
Fig. 13 Optional Adjustable Ampere Setting Rating
Plug Usedin
L ES TripUnit
a WARNING
THERE IS A HAZARDOF ELECTRICALSHOCK OR
BURNWHENEVER WORKING IN OR AROUND
ELECTRICALEQUIPMENT.ALWAYSTURN OFF
POWER SUPPLYINGBREAKER BEFORE
CONDUCTINGTESTS.
Note:Since the Digitrip
RMS 31OTrip Unitsderive
their operating power from the phasecurrents,and
not from the neutral current, passingcurrent through
the neutralsensor only will not properly test the
groundfault feature.
Usinga low voltage (0 - 24 volt), high current, AC source,
apply a test currentof 125%of the Digitrip
RMS 310
Ground FaultTripUnit pick
- upsetting throughone phase
of the circuit breaker,as shown in Fig.14
- 1.Thisshould
cause the breakerto trip in lessthan 1second, and
if an
alarm indicatoris supplied, it should operate. Resetthe
breaker and the alarm indicator.Repeatthetest on the
other two phases.
Effective March 2003 EAVN
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Page 10
Source
voltage
69
1
i
Load Current - Lim iring
Resisto!
(if required1
Fig. 14 - 1Connections for GroundFault Trip Test
Voltage
Source
Current
Limiting
Resistor
(if required)
Fig. 14 - 3 Connectionsfor GroundFault No - Trip Test, with
a Three
- WireSystem
Source
Load
Nl
Current Limiting
Resistor
(if required)
Fig. 14 - 2 Connectionsfor GroundFault No - Trip Test, with
a Four
- WireSystem
Fig. 15 TypicalRating Plug
Effective March 2003
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Page 11
GROUND FAULT TEST RECORDFORM
Ground FaultTest Record should be Retained by Those in Charge of the Building's Electrical
Installation in order to be available
to the Authority having Jurisdiction.
Test Date Circuit
Breaker
Number
Results Tested By:
Fig. 16 TypicalPerformanceTestRecord Form
Effective March 2003
EAVN
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Page 12
If the system is a 4 - wire system with a neutralcurrent
sensor, apply the same current as described above
through one phaseof the breaker, returningthrough the
neutralsensor, as shown in Fig. 14-2.Thebreakershould
nottrip, andthe alarm indicator,
if supplied,should not
operate.Repeatthe test on the other two phases.
If the system is a 3
- wire system with no neutralcurrent
sensor, apply the same current as described above
through any two phases of the breaker,with the connec
-
tions exactlyas shown in Fig. 14 - 3.The breakershould
nottrip, andthe alarm indicator,
if supplied,should not
operate. Repeatthe test usingthe other two combinations
of breakerphases.
a CAUTION
FIELDTESTING SHOULD BE USED FOR
FUNCTIONALTESTING AND NOT FIELD
CALIBRATION OFTHE DIGITRIPRMS 310 GROUND
FAULTTRIP UNIT.
ANYTEMPORARY CONNECTION MADE FORTHE
PURPOSEOF CONDUCTINGTESTS SHOULD BE
RESTOREDTO PROPER OPERATINGCONDITIONS
BEFORERETURNINGTHE BREAKERTO SERVICE.
The resultsof the test are to be recorded on the test form
providedwith the equipment.
7.0 RATING PLUG
The ratingplug, as illustratedin Figure 15, is usedto
establishthe continuousampere ratingof the related
circuit breaker.
For adjustablerating plugs (Table 1
-2),the primary
current carrying conductors used with the breaker must
be sizedto correspond with the maximumsetting of the
rating plug, in accordancewith National Electric Code
requirements.
The Long Delay protectionfunction of the trip unit is set at
the ratingplugvalue ((,).The Short Delayand Instanta
-
neous protectionfunctions are set as a multipleof In.The
Ground Fault protectionfunction is independentof In.
Differentrating plugsare available (Table 1 - 2)to match
the desired current ratingand type of circuit breaker into
which the trip unit is to be installed.
Completecatalog descriptions of all available ratingplugs
are given in the applicablecircuit breakersupplementary
instructionleaflets(seeSection
8.0).
8.0 REFERENCES
8.1 Series C L
- Frame Molded Case Circuit Breakers
29C105 Frame InstructionLeaflet
AD 29
- 167L
8.2 InternalAccessories: The followingtypes of internal
accessories,which mounton the trip unit, are availablefor
use.The numberof the instruction leafletcoveringthe
installationof each accessory is shown.
TypicalTime
- Current Characteristic
curves for L Frame Breakers
. Alarm (Signal)/Lockout(ASL) Switch ........... I.L.29C183
. AuxiliarySwitch ........................................... I.L.29C123
. ShuntTrip .................................................... I.L.29C146
. Low EnergyShuntTrip ................................ I.L.29C147
UndervoltageReleaseMechanism(Handle
Reset
........................................................... I.L.29C170
Effective March 2003
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Page 13
Table 1-1. Digitrip RMS Trip Unit Types
Trip Unit Functions
31
.
.
.
.
.
41
.
.
e
.
.
e
.
.
.
. . . . . . . . . . .
Long Delay Fixed Ampere
RatingO with
Fixed Long Delay
Adjustable Ampere
Setting with Fixed
Lono DelavO
Short Delay Adjustable Short
Delay Pick
- up with
Short DelayTime
IZtRamp
Adjustable Short
DelayTime8with
Adjustable Short
Delay Pick
- up, or
Adjustable
Instantaneous
Pick
- up8
Instantaneous
(Override)@
Instant Fixed
Ground Adjustable Ground
Fault Fault Pick
- up with
Adjustable Ground
FaultTime
Fourth
100% rating for
Pole fourth pole
Protection
60% rating for
fourth pole
Fourth pole
unprotected
. . . . . .
0 Fixedrating plugs available, seeTable 1-2
0 Optional four - setting adjustable rating plugs available, seeTable 1-2
8 Usingtrip unit with adjustable short delaytime (LSI, LSIG, LSlPand LSIE), instantaneous pick - up is achieved when the lowesttime delaysetting (I) is selected
@ A non - adjustable override setting is set at the frame withstand rating
EAVN Effective March 2003
I.L. 29C615E
LES3600LS
LES3630LS
MES3800LS
LES3600LSI
LES3630LSI
MES3800LSI
LES3600LSG
MES3800LSG
LES3600LSIG
MES3800LSIG
LES4600LSP
LES4630LSP LES4600LSIP LES4630LSIP LES4630LSE LES4630LSIE LES4600LSI LES4630LSI
LES4600LS
LES4630LS
LES4800LS
Digitrip RMS 310 Trip Unit Type Catalog Numbers
Courtesy of NationalSwitchgear.com

Page 14
Trip Unit
Ampere Rating
600A
630A
800A
Table 1-2. Digitrip RMS Trip Unit Function and Rating Settings
Trip Function
Adjustable Rating Plugs
300A-400A-500A-600A (I,)
315A-400A-500A-630A (IJO
400A-500A-630A-800A fI I or 400A-500A-600A-800A fI I
Ampere Rating
Fixed at 100%
Trip Unit
Ampere Rating
600A
800A
Adjustable Long
Delay Pick
- up
Settings
120A, 240A, 360A, 480A, and 600A
160A, 320A, 480A, 640A, and 800A
Short Delay Pick - up
(Adjustable)
Short DelayTime
(Fixed)
Short DelayTime
(Adlustable)
Instantaneous
Pick-upO
Ground Fault
Pick
- up
(Adjustable)
Ground FaultTime Delay
Fixed rating plugs available
Trip Unit Fixed Rating Plugs
Amoere Ratina
600A
630A
800A
300A, 350A, 400A, 500A, 600A (I,)
300A, 315AO, 350A, 400A, 500A, 600A, 630AO (I,)
400A. 500A. 600A. 700A. 800A (I-!
In multiples of installed rating plug amperes
(I,) with marks at 2 - 3 - 4 - 5 - 6 - 7 - 8x
IZtramp configuration
Flat response with time delay settings at
100 ms
200 ms and 300 ms
Settinas at instantaneous (1). 150ms. 300ms. and 500ms
0 Not ULListed
O Occurs with short delay time adjustment set at I
Cutler - Hammer
Pittsburgh, Pennsylvania USA
Style No. 6633C98H06 Effective March 2003
Printed in USA/TQC
I.L. 29C615E
Rating/Setting Description
Courtesy of NationalSwitchgear.com