Eaton Digitrip RMS 310 Instruction Leaflet
Eaton Digitrip RMS 310 is an electronic trip unit designed for use with K-Frame Series C Molded Case Circuit Breakers, providing true RMS current sensing for proper correlation with thermal characteristics of conductors and equipment. It offers various protection features including short delay pick-up, short delay time, ground fault pick-up, and ground fault time.
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Instruction Leaflet
IL29C614F
Effective December 2011
Supersedes IL29C614E 02/09
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Contents
Description Page
1.0 General Information . . . . . . . . . . . . . . . . . . . . . 2
2.0 UL Listed Devices . . . . . . . . . . . . . . . . . . . . . . 3
3.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.0 Principle of Operation . . . . . . . . . . . . . . . . . . 11
5.0 Protection Settings . . . . . . . . . . . . . . . . . . . . 11
6.0 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.0 Rating Plug . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.0 References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Instruction Leaflet IL29C614F
Effective December 2011
!
WARNING
DEATH, SEVERE PERSONAL INJURY, OR SUB-
STANTIAL PROPERTY DAMAGE CAN RESULT
FROM CONTACT WITH ENERGIZED EQUIPMENT.
DO NOT ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS ENER-
GIZED. ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENT BEFORE PROCEEDING WITH THE TASK,
AND ALWAYS FOLLOW GENERALLY ACCEPTED
SAFETY PROCEDURES.
EATON IS NOT LIABLE FOR THE MISAPPLICATION
OR MISINSTALLATION OF ITS PRODUCTS.
The User is cautioned to observe all recommendations, warnings, and cautions relating to the safety of personnel and equipment as well as all general and local health and safety laws, codes, and procedures.
The recommendations and information contained herein are based on Eaton experience and judgment, but should not be considered to be all-inclusive or covering every application or circumstance which may arise.
If any questions arise, contact Eaton for further information or instructions.
1.0 GENERAL INFORMATION
1.1 PROTECTION
The Digitrip RMS 310, illustrated in Figures 1a , and 1b , is an electronic trip unit that incorporates a microprocessor-based custom application specific integrated circuit design for use with Series C K-Frame Molded Case
Circuit Breakers.
The Digitrip RMS 310 provides true RMS current sensing for proper correlation with thermal characteristics of conductors and equipment. Interchangeable rating plugs are provided to establish the continuous current rating of each circuit breaker.
The Digitrip RMS 310 Trip Unit is completely self-contained and when the circuit breaker is closed, requires no external control power to operate its protection systems.
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
2 EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Instruction Leaflet IL29C614F
Effective December 2011
Figure 1a Digitrip RMS 310 Trip Unit for 3-Pole K-
Frame Series C Circuit Breaker.
Figure 1b Digitrip RMS 310 Trip Unit for 4-Pole K-
Frame Series C Circuit Breaker.
It operates from current signal levels and control power derived through current sensors integrally mounted in the trip unit.
Digitrip RMS 310 Trip Units are suitable for 50/60 Hz AC applications only. For DC applications, a thermal-magnetic trip unit should be used.
The Digitrip RMS 310 Trip Unit is available in 4 different types, (see Table 1-1 ). Each trip unit contains a fixed long delay time function (adjusted by changing the rating plug), and may be equipped with a maximum of two phase and two ground (time current)adjustments to meet specific application requirements. The types of adjustments available for each model include the following:
Protection
1. Short Delay Pick-up
2. Short Delay Pick-up/
Short Delay Time
3. Short Delay Pick up/Ground
Fault Pick-up/Ground Fault Time
4. Short Delay Pick-up/Short
Delay Time/Ground Fault Pick-up
/Ground Fault Time
Type
KESxxxxLS, LSE
KESxxxxLSI, LSIE
KESxxxxLSG
KESxxxxLSlG
2.0 UL LISTED DEVICES
The Digitrip RMS 310 Trip Unit is listed in accordance with Underwriters Laboratories, Inc. Standard UL489, under File E7819 and satisfies the applicable require ments of the International Electrotechnical Commission
(IEC) recommendations for molded case circuit breakers.
3.0 INSTALLATION
3.1 PREPARATION (ALL TRIP UNITS)
The installation procedure consists of inspecting and installing the trip unit and rating plug. To install the trip unit, perform the following steps.
NOTICE
If required, internal accessory installation should be done before the circuit breaker is mounted and connected. Refer to individual accessory instruction leaflets.
Make sure that the trip unit is suitable for the intended installation by comparing nameplate data with any existing equipment and system requirements. Inspect the trip unit for completeness, and check for damage before installing it in the circuit breaker frame.
NOTICE
3-pole KES trip units may be used in 4-pole circuit breakers if the fourth pole is unprotected. A 4-pole
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3
Instruction Leaflet IL29C614F
Effective December 2011
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Circuit
Breaker
Base
Conductor
Bar
Shunt
Plate
Inserts
Conductor
Barriers
Conductor
Barriers
Load End (Cover Removed)
Figure 2 Conductor Barriers (4-pole Circuit Breaker
Frame Shown).
Shunt
Plates
Base
Base
Conductors
Figure 3 Base Conductors in Position and Shunt Plates
Centered Over Base Inserts.
KES trip unit is required to provide protection of the fourth pole of a 4-pole circuit breaker.
Trip Unit center retaining screw is supplied with the trip unit; the remaining retaining screws (2 for a 3pole trip unit, 3 for a 4-pole trip unit) are supplied with the circuit breaker frame.
Remove circuit breaker cover screws, and cover.
Remove conductor barriers from base (see Figure 2 ).
NOTICE
If installing a 4-pole trip unit, remove conductor bar from the right-hand (fourth) pole (Figure 2). Discard the conductor but keep the retaining screw.
Make sure circuit breaker base conductors are positioned in slots in base (see Figure 3 ).
Remove screws from shunt plate inserts (see Figure 3 ).
NOTICE
The trip unit outer screws may be placed in the trip unit conductor holes at this time. If preferred, a magnetic screwdriver may be used to position the screws when the trip unit is in the base.
Make sure shunt plates are centered over shunt plate inserts (see Figure 3).
To continue installation, proceed to the section applicable to the trip unit being installed:
Trip Unit Type
4-pole Type Trip Unit
3-pole Ground Fault Trip Unit
3-pole Non-Ground Fault Trip Unit
Section
3.2
3.3
3.4
3.2 4-POLE TRIP UNIT INSTALLATION
Remove barrier between the third and fourth (righthand) pole. Find the scored tab (Figure 4 ) and break away from the barrier to leave a square notch.
Place the trip unit and fourth pole current sensor side by side on a flat surface (see Figure 5 ).
Remove the CAUTION tag from the current sensor secondary winding leads.
NOTICE
Secondary winding connector is not polarized.
4 EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Instruction Leaflet IL29C614F
Effective December 2011
Bend Tab at Scored Line and Break Out
Notch Is
Positioned
Towards Load
End of Circuit
Breaker and
Is Closer to
Base than Cover
Figure 4 Scored Tab in Barrier.
Latch
Side
Plate
Trip Unit
Retaining
Screws
Trip Unit
Line End
Latch Bracket
Pin
Load End
Barrier
Secondary
Winding
Connector
Side
Plate
Trip Unit and Current
Sensor
Retaining
Screws
Fourth
Pole
Current
Sensor
Figure 6 Trip Unit with Rating Plug Installed in Circuit
Breaker.
Retaining Screw
(3 Places) Barrier
Current Sensor
Retaining Screw
Trip Unit Secondary
Winding
Connector
Figure 5 Preliminary Alignment of Trip Unit with Rating
Plug and Current Sensor.
Plug the current sensor secondary winding connector into the receptacle in the side of the trip unit. Either polarity is acceptable.
Position the retaining screws in the trip unit and current sensor conductor holes.
Place the barrier with the notch between the trip unit and the current sensor. The notch must fit around the secondary winding connector.
Position trip unit together with the barrier and current sensor in the circuit breaker (see Figure 6 ). Make sure latch bracket pin is properly seated in slots in side plates. If necessary, latch may be moved toward load end of circuit breaker to seat trip unit.
!
CAUTION
DO NOT EXCEED A TORQUE OF 6 TO 8 LB.-FT (8
TO 10 N.M). EXCESSIVE TORQUING WILL SHEAR
SCREWS.
FAILURE TO APPLY THE REQUIRED TORQUE MAY
LEAD TO EXCESSIVE HEATING AND CAUSE NUI-
SANCE TRIPPING OF THE CIRCUIT BREAKER.
Screw in and tighten three trip unit retaining screws
(center first) and the screw for the current sensor in the fourth pole. Torque to 6 to 8 lb.-ft (8 to 10 N.m) (see
Figure 6 ).
Install accessory(ies), if required, using appropriate instruction leaflet listed in Section 8.2.
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5
Instruction Leaflet
Effective December 2011
IL29C614F Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
(
2X Ø
[7,11]
.280
THRU HOLE
POLARITY MARKINGS
.617
([15.67])
)
1.50 AT TOP
[38,1]
.50
.03
[0,76]
[12,70]
4X R
[9,14]
.36
.31
[7,87]
[6,35]
.25
1.47
[37,34]
1.44
[36.58]
( 4.376
([111,13])
5.610
[142.49]
)
5.69
AT TOP
[144,53]
4X R
[7,11]
.28
( 1.000
([25,40])
)
( 2.000
([50,80])
)
1/2" BOLTS
(NOT INCLUDED)
.50
12,70]
2.188
[55,58]
2.25
[57,15]
1.188
[30,18]
1.17
[29,72]
5.75
[146,05]
AT BASE 2.25
[57,15]
AT TOP
2.33
[59,18]
AT BASE
2.91
[73,91]
AT BASE
Figure 7 Neutral Current Sensor.
Finish installation of the 4-pole Trip Unit by following the instructions in Section 3.5.
3.3 GROUND FAULT TRIP UNIT INSTALLATION
3.3.1 GENERAL
Ground fault trip units are supplied from the factory with one auxiliary switch with pigtail leads (red, blue and black wires) and pigtail lead connections for a neutral current sensor (white and grey wires) and a ground fault alarm relay (yellow and green wires). A neutral current sensor is provided with each trip unit, and the ground fault alarm relay is ordered and shipped separately if required. If the auxiliary switch or the alarm relay are not required, the corresponding leads should be cut off before the trip unit is installed in the breaker.
Digitrip RMS 310 Ground Fault Trip Units detect ground fault currents through Residual Sensing. They are not designed to use source ground or zero sequence ground fault sensing methods. If the system neutral is grounded, but no phase to neutral loads are used, the neutral current sensor is not necessary. In that case, the white and grey leads on the trip unit should be cut off before installation.
If the system neutral is grounded and phase to neutral loads are used, then the neutral current sensor (see
Figure 7 ) must be used. It should be connected to the breaker according to the diagram in Figure 8 . It has the same turns ratio as the phase current sensors in the trip unit.
NOTICE
The polarity of the sensor connections is critical.
Always observe the polarity markings on the installation drawings. The polarity markings are identified as white dots on the transformers. To insure correct ground fault equipment performance, conduct field
6 EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
L
Source
C R N
NO Red
NC Blue
C Black
Grey
White
Yellow
Green
120
Vac
Neutral
Sensor
G.F. Alarm Relay
(Optional)
L1
L2
NO
NC
Remote
Reset Test
(Optional)
Load
*Auxiliary switch shown in the "Breaker Contacts Open" positon.
Figure 8 Neutral and Alarm Wiring Diagram.
Connector
Insert
Connector,
Then Push
Down
PC Board
Instruction Leaflet IL29C614F
Effective December 2011 tests to comply with National Electric Code requirements under Article 230-95(C). See Section 6.2 for testing instructions.
The optional “Internal Accessories” listed in Section 8.2
are available for installation in the right pole of a Digitrip
RMS 310 Ground Fault Trip Unit. These items, if required, must be ordered separately and installed per the instructions in Section 3.3.3.
3.3.2 INSTALLATION
Position trip unit in base. Make sure latch bracket pin is properly seated in slots in side plates (see Figure 6 ). If necessary, move latch toward load end of breaker to seat trip unit.
!
CAUTION
DO NOT EXCEED A TORQUE OF 6 TO 8 LB.-FT
(8 TO 10 NM). EXCESSIVE TORQUING WILL SHEAR
SCREWS.
FAILURE TO APPLY THE REQUIRED TORQUE MAY
LEAD TO EXCESSIVE HEATING AND CAUSE NUI-
SANCE TRIPPING OF THE CIRCUIT BREAKER.
Screw in and tighten three trip unit retaining screws
(center first). Torque to 6 to 8 lb.-ft (8 to 10 Nm) (see
Figure 6 ).
To install the ground fault alarm and neutral current sensor connector printed circuit board, an accessory switch must be installed in order to provide a support bracket. If the auxiliary switch supplied with the trip unit will be used, install it in the right pole of the breaker per IL
29C122.
NOTICE
See wiring instructions in Section 3.3.3 for special restrictions on accessory wiring for ground fault breakers.
Next, insert the four-position connector on the printed circuit board into the receptacle in the trip unit and push the board down onto the bracket (see Figure 9 ).
View from right side of breaker.
Figure 9 Installing Ground Fault Alarm and Current
Sensor Connector PC Board.
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Instruction Leaflet IL29C614F
Effective December 2011
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
3.3.3 ACCESSORY INSTALLATION WITH GROUND
FAULT TRIP UNITS
If an accessory other than the auxiliary switch supplied with the trip unit is to be used, install the accessory by using the appropriate instruction leaflet listed in Section 8.2.
NOTICE
See wiring instructions below for special restrictions on accessory wiring for ground fault breakers.
Then install the ground fault alarm and neutral current sensor connector printed circuit board as described above.
!
CAUTION
LEADS COULD BE DAMAGED IF IN CONTACT WITH
MOVING PARTS. ACCESSORY WIRES SHOULD BE
FORMED AND ROUTED TO CLEAR ALL MOVING
PARTS.
When the appropriate accessory and the connector board are installed there are up to three sets of leads to be routed:
1. Two leads (white and grey) for the neutral current sensor,
2. Two leads (yellow and green) for the ground fault alarm relay, and
3. Three leads (red, blue and black) for the accessory switch.
If all three sets of connections are required, it is not possible to have leads exiting breaker on the opposite side.
For rear existing leads (preferred), thread the leads through the wiring troughs in the side of the circuit breaker case. For side existing leads, use the slots in the side of the case. Use the trough or slot farthest from the trip unit for the auxiliary switch leads(red, blue and black), the center trough or slot for the neutral current sensor leads (white and grey), and the trough or slot closest to the trip unit for the alarm leads (yellow and green).
If only one or two sets of leads are required, they can be routed to the side or rear as above, or one set can be fed to the opposite side through the rear wiring trough.
This set of leads should first be threaded through the center wiring trough in the side of the case, then through the rear wiring trough. Any other leads to be brought out should then be threaded through the wiring trough closest to the trip unit.
Finish installation of the ground fault trip unit by following the instructions in Section 3.5.
3.4 3-POLE (NON-GROUND FAULT) TRIP UNIT
INSTALLATION
Position trip unit in base. Make sure latch bracket pin is properly seated in slots in side plates (see Figure 6 ). If necessary, move latch toward load end of circuit breaker to seat trip unit.
!
CAUTION
DO NOT EXCEED A TORQUE OF 6 TO 8 LB.-FT
(8 TO 10 NM). EXCESSIVE TORQUING WILL SHEAR
SCREWS.
FAILURE TO APPLY THE REQUIRED TORQUE MAY
LEAD TO EXCESSIVE HEATING AND CAUSE NUI-
SANCE TRIPPING OF THE CIRCUIT BREAKER.
Screw in and tighten three trip unit retaining screws
(center first). Torque to 6 to 8 lb.-ft (8 to 10 Nm) (see
Figure 6 ).
Install accessory(ies), if required, using the appropriate instruction leaflet listed in Section 8.2.
3.5 FINAL INSTALLATION INSTRUCTIONS (ALL
TRIP UNITS)
Install conductor barriers in slots in base (see Figure 2 ).
!
CAUTION
DAMAGED THREADS CAN RESULT IN IMPROPER
CIRCUIT BREAKER COVER RETENTION. WHEN
REMOVING OR REINSTALLING, THREAD FORMING
SCREWS TRY TO RE-FORM THE THREADS IN THE
CIRCUIT BREAKER BASE. CARE SHOULD BE
TAKEN EVERY TIME A THREAD FORMING SCREW
IS USED TO ENSURE THE SCREW STARTS IN THE
ORIGINAL THREADS.
NOTICE
When the trip unit is installed in a new circuit breaker frame, the remaining cover mounting hard ware is supplied in a plastic bag with the frame.
8 EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Instruction Leaflet IL29C614F
Effective December 2011
Trip
Unit
Pins
Engaged
Remove
Push-to-
Trip
Receptacles
Figure 11 Installing Rating Plug.
Rating Plug
Plunger
Slot
Fourth
Pole
Protected
Label
Screw, .190-32 x 3.125 in. (79.38 mm), Pan Head, Cross-
Recessed.
Screw, No. 8 x 1.63 in. (41.40 mm), Flat Head, Cross-Recessed,
Thread Forming.
Figure 10 Cover Screw Installation Positions.
Install circuit breaker cover and pan-head screws followed by thread forming screws as shown in Figure 10 .
An additional label is included with each four pole trip unit. Position the label marked Fourth Pole Protected in the location shown in Figure 10 .
!
CAUTION
THE RATING PLUG MECHANICALLY INTERLOCKS
WITH THE TRIP UNIT. IF THE RATING PLUG IS NOT
CORRECTLY INSTALLED, THE CIRCUIT BREAKER
CANNOT BE RESET OR PLACED IN THE ON POSI-
TION.
NOTICE
Before attempting to install the rating plug, the arrow in the Push-to-Trip button portion of the plug must be pointing toward the REMOVE position. This can be done with a small screwdriver.
Install rating plug. Position the rating plug as shown in
Figure 11 . Insert the rating plug in the trip unit. The two pins and plunger must align correctly with the matching receptacles and slot in the trip unit. After the rating plug is pressed into position, depress the Push-to-Trip button with a small screwdriver and turn it clockwise one quarter of a turn until the arrow points to ENGAGED. If an adjustable rating plug is used, four continuous current settings are possible. Set the switch marked A, B, C, D to the current rating desired (see Figure 13 ).
Reset circuit breaker by moving handle to the reset position. Move handle to the ON position. Circuit breaker handle should remain at the ON position.
Press Push-to-Trip button (in rating plug) to check manual tripping of the circuit breaker.
The status light monitors the operation of the trip unit as explained in Section 4.0.
NOTICE
The reverse procedure is used to remove the rating plug. Turn the Push-to-Trip button to the remove position. This action will cause the circuit breaker to trip. Then grasp the lip of the Push-to-Trip button and gently pull. A small screwdriver placed under the left edge of the rating plug will assist in removal.
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9
Instruction Leaflet
Effective December 2011
IL29C614F Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
2 8
4
5
6
3 7
2 8
Short Delay Pick-up
(Multiples of Rated Current I n
)
Current I n
Figure 12-1 Short Delay Trip Current Adjustment and
Curve Details.
1x
3 x I
G
2 x I
G
4 x I
G
5 x I
G
5x
500
300
150
I
1 x I
G
Ground Fault Pick-up
500
300
150
I
Time ms
Ground Current I
G
Figure 12-3 Ground Fault Trip Current, and Ground
Fault Trip Time Adjustments and Curve Details.
I n
D
C B A
Rating Plug Setting (Amperes)
2 8
300
200
100
4
5
6
3 7
2 8
Short Delay Pick-up
(Multiples of Rated Current)
200
300
100
I
I
Current I n
Figure 12-2 Short Delay Trip Current and Short Delay
Trip Time Adjustment and Curve Details.
200A 250A 315A 400A
2x-8x
2x-8x
2x-8x
2x-8x
Current I n
Figure 13 Optional Adjustable Ampere Setting Rating
Plug Used in Digitrip RMS 310 Trip Unit.
10 EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Instruction Leaflet IL29C614F
Effective December 2011
4.0 PRINCIPLE OF OPERATION
In open air at 40°C (104°F), an K Frame circuit breaker with a Digitrip RMS 310 Trip Unit installed will carry continuously up to 400 amperes without exceeding a 50°C
(122°F) rise at the terminals. The calibration of the trip unit is insensitive to ambient temperatures over a range of -20 to +55°C (-4 to 131°F) . However, the trip unit contains thermal temperature protective circuitry that initiates a trip operation for self-protection if the internal ambient temperature at the printed circuit board (PCB) reaches approximately 90°C (194°F). This may occur for open air temperatures above 40°C with circuit breaker currents near full load.
For ambient conditions above 40°C and where the maximum ampere rating plug has been installed, derating of the circuit breaker frame should be considered to avoid exceeding a safe terminal temperature operating range.
Consult Eaton for recommendations.
4.1 GENERAL
The Digitrip RMS 310 Trip Unit provides a tripping signal to the flux transfer shunt trip when current and time delay settings are exceeded. This is accomplished by employing the Eaton custom designed integrated circircuit Sµre™ chip, which includes a microcomputer to perform its numeric and logic functions.
In the Digitrip RMS 310 Trip Unit, all required sensing and tripping power to operate its protection function is derived from the current sensors in the circuit breaker.
The secondary currents from these sensors provide the correct input information for the protection functions, as well as tripping power, when ever the circuit breaker is carrying current. These current signals develop voltages across the appropriate calibrating resistors.
The microcomputer, in cyclic fashion, repeatedly scans the voltage values across each calibrating resistor and enters these values into memory. These data are used to calculate true RMS current values, which are then repeatedly compared with the protection function settings and other operating data stored in the memory. The software program then determines whether to initiate protection functions, including tripping the breaker through the flux transfer shunt trip device in the circuit breaker.
A green status light 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 breaker may be less than 20% of the maximum current rating of the trip unit.
If the current exceeds 20% and the status light is not blinking, use the STK2 test kit to investigate (see section
6.1). IF THE STATUS LIGHT IS ON STEADY, IT INDI-
CATES A TRIP IS PENDING.
!
CAUTION
LACK OF ILLUMINATION OF THE STATUS LED
DOES NOT INDICATE THE TERMINALS OF THE
BREAKER ARE DEENERGIZED.
4.2 OVERLOAD TRIP
In accordance with standards requirements, the trip unit initiates a trip of the circuit breaker within two hours for an overload of 135 %, and will trip in less time for higher overload currents.
A “Thermal Memory” effect prevents the breaker from being re-energized immediately after an overload trip. A
“cooling off” period of up to 5 minutes is required, which allows time for cabling to cool off.
4.3 SHORT DELAY/INSTANTANEOUS TRIP
For short circuit conditions that exceed the short delay pick-up settings, the trip unit initiates a trip after a delay prescribed by the I 2 t ramp function for trip units with catalog number suffixes LS, LSE, LSP, and LSG. A flat response time delay action is provided by trip units with catalog number suffixes LSI, LSIE, and LSIG unless the instantaneous (I) setting is selected.
4.4 GROUND FAULT PROTECTION
When selected, ground fault pick up and time delay settings shown in Table 1-2 allow selective ground fault coordination with other circuit protection devices.
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 n
) of the circuit breaker. Short delay current settings are defined in multiples of I n
.
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11
Instruction Leaflet IL29C614F
Effective December 2011
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Figure 14 Adjustment Switches and Test Points.
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 14 ).
5.2 SHORT DELAY PICK-UP SETTING
Seven settings are available that range from 2 to 8 (I
Digitrip RMS 310 Trip Units. n
) as shown in Figure 12-1 . This feature is included on all
5.3 SHORT DELAY TIME SETTINGS
For catalog number KESxxxxLS, -LSG, -LSP and -LSE, the short time delay is an I 2 t ramp configuration with the actual time delay a function of the trip current involved.
For catalog numbers KESxxxxLSI, -LSIG, and LSIE, the short time delay is a flat response. Four settings (I, .1,
.2, .3 second) are available (see Figure 12-2 ). The “I” setting gives a trip response with no intentional delay
(Instantaneous).
5.4 INSTANTANEOUS PICKUP SETTING
For catalog numbers KESxxxxLSI, -LSIG, and LSIE,
Instantaneous Pick-up is achieved by setting Short
Delay Time to “I” (Instantaneous). Short Delay Pickup
(see paragraph 5.2) then becomes Instantaneous
Pickup.
5.5 GROUND FAULT PICK-UP SETTING
Five settings ranging from 1 through 5 (xl
G
) are available (see Figure 12-3 )and correspond to the fixed ampere values listed on the trip unit nameplate and in
Table 1-2 .
NOTICE
These ampere values are always the same no matter what rating plug is installed in the circuit breaker.
Available on Catalog Nos. KES3xxxLSG and LSIG.
5.6 GROUND FAULT TIME SETTINGS
The ground fault time delay is a flat response with four settings (I, .15, .3, .5 second) available (Figure 12-3 ).
The I setting gives a trip response with no intentional delay (Instantaneous). This option is available on
Catalog Nos. KES3xxxLSG and -LSIG.
6.0 TESTING
6.1 FUNCTIONAL FIELD TESTING
A test receptacle is built into each trip unit to allow use of the STK2 Test Kit. The Test Kit performs a test of the
Long Delay, Short Delay and Ground Fault functions.
6.2 PERFORMANCE TESTING FOR GROUND
FAULT TRIP UNITS
6.2.1 CODE REQUIREMENTS
The National Electrical Code under Article 230-95-C requires that any ground-fault protection system be performance tested when first installed. The test shall be conducted in accordance with approved instructions provided with the equipment. A written record of this test shall be made and shall be available to the authority having inspection jurisdiction.
6.2.2 STANDARDS REQUIREMENTS
As a follow-up to the basic performance requirements stipulated by the N.E.C. as stated above, UL Standard
No. 1053 requires that certain minimum instructions must accompany each ground fault protection system.
These following statements plus a copy of the test record form illustrated in Figure 17 are shipped with each Digitrip RMS 310 Trip Unit.
6.2.3 GENERAL TEST INSTRUCTIONS
The interconnected system shall be evaluated in accordance with the equipment assembler’s detailed instructions by qualified personnel.
12 EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Low
Voltage
Source
Line Side
L C R N
Polarity
Marks
Line Side
L C R
Instruction Leaflet IL29C614F
Effective December 2011
Low
Voltage
Source
N
Polarity
Marks
Load Side
Current-Limiting
Resistor
(If Required)
Figure 15-1 Connections for a Trip Test on Ground
Fault.
The polarity of the neutral sensor connections (if used) must agree with equipment assembler’s detailed instructions to avoid improper operations following apparently correct simulated test operations. Where a question exists, consult the specifying engineer and/or equipment assembler.
The grounding points of the system shall be verified to determine that ground paths do not exist that would bypass the sensors. The use of high-voltage testers and resistance bridges may be used.
!
WARNING
THERE IS A HAZARD OF ELECTRICAL SHOCK OR
BURN WHENEVER WORKING IN OR AROUND
ELECTRICAL EQUIPMENT. ALWAYS TURN OFF
POWER SUPPLYING BREAKER BEFORE CON-
DUCTING TESTS.
Load Side
Current-Limiting
Resistor
(If Required)
Figure 15-2 Connections for a No-Trip Test on Ground
Fault for a Four-Wire System.
NOTICE
Since the Digitrip RMS 310 Trip Units derive their operating power from the phase currents, and not from the neutral current, passing current through the neutral sensor will not properly test the ground fault feature.
When testing the lowest Ground Fault Pick Up (GFPU) setting, 1 x
I
G
, t he indicated connections in Figure 15-4a must be used. For single phase currents that are
20% of the sensor current rating, the trip unit will not power up. Therefore, Ground Fault testing cannot be performed in the usual manner.
The connections displayed in Figure 15-4a and 15-4b effectively multiply the power up current by a factor of 3.
With this setup, two of the three currents will cancel and the third current sh o uld cause the breaker to t ri p at the lowest setting.
EATON CORPORATION www.eaton.com
13
Instruction Leaflet IL29C614F
Effective December 2011
Source
L C R
Low
Voltage
Source
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Low
Voltage
Source
Line Side
I
L C R
I I
N
Polarity
Marks
I
14
Figure 15-3 Connections for Ground Fault No-Trip Test, with a Three-Wire System.
For all other GFPU settings, using a low voltage
(0-24 volt), high current, AC source, apply a test current of 125% of the Digitrip RMS 310 Ground
Fault Trip Unit pick-up setting through one phase of the circuit breaker, as shown in Figure 15-1 .
This should cause the breaker to trip in less than 1 second, and if an alarm indicator is supplied, it should operate. Reset the breaker and the alarm indicator. Repeat the test on the other two phases.
If the system is a 4-wire system with a neutral current sensor, apply the same current as described above through one phase of the breaker, returning through the neutral sensor, as shown in Figure 15-2 . The breaker should not trip, and the alarm indicator, if supplied, should not operate. Repeat the test on the other two phases.
If the system is a 3-wire system with no neutral current sensor, apply the same current as described above through any two phases of the breaker, with the connections exactly as shown in Figure 15-3 . The breaker should not trip, and the alarm indicator, if supplied, should not operate. Repeat the test using the other two combinations of breaker phases.
The results of the test are to be recorded on the test form provided with the equipment.
Load Side
Current-Limiting
Resistor
(If Required)
Figure 15-4a Connections for a Trip Test on Ground
Fault when testing the lowest of pickup setting.
Source
I
L C R
Low
Voltage
Source
I
I
Current-Limiting
Resistor
(If Required)
Figure 15-4b Connections for Ground Fault Trip Test with a Three-Wire System when testing the lowest GF pickup setting.
!
CAUTION
FIELD TESTING SHOULD BE USED FOR FUNCTION-
AL TESTING AND NOT FIELD CALIBRATION OF
THE DIGITRIP RMS 310 GROUND FAULT TRIP UNIT.
ANY TEMPORARY CONNECTION MADE FOR THE
PURPOSE OF CONDUCTING TESTS SHOULD BE
RESTORED TO PROPER OPERATING CONDITIONS
BEFORE RETURNING THE BREAKER TO SERVICE.
EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Instruction Leaflet IL29C614F
Effective December 2011
GROUND FAULT TEST RECORD FORM
Ground Fault Test 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:
7.0 RATING PLUG
The rating plug, as illustrated in Figure 16 , is used to establish the continuous ampere rating of the related circuit breaker.
Push-to-Trip Button
Figure 16 Typical Rating Plug.
Pins
Plunger
For adjustable rating plugs (Table 1-2 ), the primary current carrying conductors used with the breaker must be sized to correspond with the maximum setting of the rating plug, in accordance with National Electrical Code requirements.
The Long Delay protection function of the trip unit is set at the rating plug value (I n
).The Short Delay and
Instantaneous protection functions are set as a multiple of I n
. The Ground Fault protection function is independent of I n
.
Different rating plugs are available (Table 1-2 ) to match the desired current rating and type of circuit breaker into which the trip unit is to be installed.
Complete catalog descriptions of all available rating plugs are given in the applicable circuit breaker supplementary instruction leaflets (see Section 8.0).
8.0 REFERENCES
8.1 SERIES C K-FRAME MOLDED CASE CIRCUIT
BREAKERS
EATON CORPORATION www.eaton.com
15
Instruction Leaflet IL29C614F
Effective December 2011
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
29C104 Frame Instruction Leaflet
AD 29-167K Typical Time-Current Characteristic
Curves for K-Frame Breakers
8.2 INTERNAL ACCESSORIES
The following types of internal accessories, which mount on the trip unit, are available for use. The number of the instruction leaflet covering the installation of each accessory is shown.
• Alarm (Signal)/Lockout (ASL) Switch ........I.L. 29C182
• Auxiliary Switch..........................................I.L. 29C122
• Shunt Trip ..................................................I.L. 29C144
• Low Energy Shunt Trip ..............................I.L. 29C145
• Undervoltage Release Mechanism
(Handle Reset) ..........................................I.L. 29C166
8.3 ATTACHMENT AND GROUND FAULT ALARM
UNIT CATALOG NUMBERS
Catalog
Number
A1X3PK
A1X3RTK
AAL3RPK
AAL3RTK
GFAU
Additional
Components
Auxiliary Switch and Pigtail Leads
Auxiliary Switch and Terminal Block
Alarm Signal/(Lockout) Switch and
Pigtail Leads
Alarm Signal/(Lockout) Switch and
Terminal Block
Ground Fault Alarm Unit
Table 1-1 Digitrip RMS 310 Trip Unit Type Catalog Numbers.
Trip Unit Functions
Long
Delay
Short
Delay
Instant.
Ground
Fault
Fourth
Pole
Protection
Fixed Ampere
Rating ➀ with
Fixed Long Delay
Adjustable Ampere
Setting with Fixed
Long Delay ➁
Adjustable Short
Delay Pick-up with
Short Delay Time
I 2 t Ramp
Adjustable Short
Delay Time ➂ with
Adjustable Short
Delay Pick-up, or
Adjustable
Instantaneous
Pick-up ➂
Fixed
Instantaneous
(Override) ➃
Adjustable Ground
Fault Pick-up with
Adjustable Ground
Fault Time
100% Rating for Fourth Pole
50% Rating for Fourth Pole
3 POLE 4 POLE
KES3125LS KES3125LSI KES3125LSG KES3125LSIG KES4400LS KES4400LSI KES4400LSE KES4400LSIE
KES3250LS KES3250LSI KES3250LSG KES3250LSIG KES4250LS KES4250LSI KES4250LSE KES4250LSIE
KES3400LS KES3400LSI KES3400LSG KES3400LSIG
• • • • • • • •
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
➀ Fixed rating plugs available, see Table 1-2 .
➁ Optional four-setting adjustable rating plugs available, see Table 1-2 .
➂ Using trip unit with adjustable short delay time (LSI, LSIG, and LSIE), instantaneous pick-up is achieved when the lowest time delay setting (I) is selected.
➃ A non-adjustable override setting is set at the frame withstand rating.
16 EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Instruction Leaflet IL29C614F
Effective December 2011
Table 1-2 Digitrip RMS 310 Trip Unit Trip Function and Rating Settings.
Trip Function
Ampere Rating
Fixed at 100%
Rating/Setting Description
Fixed rating plugs available:
Adjustable Long Delay
Pick-up
Trip Unit
Ampere Rating
125A
2 5 0 A
400A
Adjustable rating plugs available:
Trip Unit
Ampere Rating
125A
250A
400A
Fixed Rating Plugs
63A ➀
1 2 5 A ,
, 70A, 90A, 100A, 110A, 125A (I
1 5 0 A , 1 6 0 A ➀ , 175A, 200A, 225A, 250A (I
200A, 225A, 250A, 300A, 315A ➀ n
)
, 350A, 400A (I n n
)
)
Adjustable Rating Plugs
70A-90A-100A-125A (I n
63A-80A-100A-125A (I n
)
)
125A-150A-200A-250A (I n
125A-160A-225A-250A (I n
200A-250A-300A-400A (I
200A-250A-315A-400A (I
250A-300A-350A-400A (I
➀ n n n
)
)
)
➀
)
)
➀
Short Delay Pick-up
(Adjustable)
Short Delay Time
(Fixed)
Short Delay Time
(Adjustable)
Instantaneous
Pick-up
Pick-up
➁
Ground Fault
(Adjustable)
I
In multiples of installed rating plug amperes
(I
2 n
) with marks at 2-3-4-5-6-7-8x t ramp configuration
Flat response with time delay settings at
100 ms, 200 ms, and 300 ms
In multiples of installed rating plug amperes
(I n
) with marks at 2-3-4-5-6-7-8x
Trip Unit
Ampere Rating Settings
400A
250A
125A
80A, 160A, 240A, 320A, and 400A
50A, 100A, 150A, 200A, and 250A
25A, 50A, 75A, 100A, and 125A
Settings at instantaneous (I), 150ms, 300ms, and 500ms Ground Fault Time Delay
➀ Not UL Listed.
➁ Occurs with short delay time adjustment set at I.
EATON CORPORATION www.eaton.com
17
Instruction Leaflet IL29C614F
Effective December 2011
Notes:
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
18 EATON CORPORATION www.eaton.com
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Notes:
Instruction Leaflet IL29C614F
Effective December 2011
EATON CORPORATION www.eaton.com
19
Instruction Leaflet IL29C614F
Effective December 2011
The instructions for installation, testing, maintenance, or repair herein are provided for the use of the product in general commercial applications and may not be appropriate for use in nuclear applications. Additional instructions may be available upon specific request to replace, amend, or supplement these instructions to qualify them for use with the product in safety-related applications in a nuclear facility.
This Instruction Booklet is published solely for information purposes and should not be considered all-inclusive. If further information is required, you should consult an authorized Eaton sales representative.
The sale of the product shown in this literature is subject to the terms and conditions outlined in appropriate Eaton selling policies or other contractual agreement between the parties. This literature is not intended to and does not enlarge or add to any such contract.
The sole source governing the rights and remedies of any purchaser of this equipment is the contract between the purchaser and Eaton.
NO WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING
WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR
MERCHANTABILITY, OR WARRANTIES ARISING FROM COURSE
OF DEALING OR USAGE OF TRADE, ARE MADE REGARDING
THE INFORMATION, RECOMMENDATIONS, AND DESCRIPTIONS
CONTAINED HEREIN.
In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or otherwise 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 system, 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, recommendations and description contained herein.
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
Eaton Corporation
Electrical Sector
1111 Superior Ave.
Cleveland, OH 44114
United States
877-ETN-CARE (877-386-2273)
Eaton.com
© 2011 Eaton Corporation
All Rights Reserved
Printed in USA
Publication No. IL29C614F / TBG000772
Part No. 6612C36H06
December 2011
Eaton is a registered trademark of Eaton
Corporation.
All other trademarks are property of their respective owners.
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