Instruction Leaflet for the LES/MES 310+ Electronic Trip Unit

Instruction Leaflet IL012043EN
Effective January 2016
Supersedes 12/2014
Instruction Leaflet for the
LES/MES 310+ Electronic Trip Unit
Contents
DescriptionPage
Section
Section
Section
Section
Section
1:
2.
3.
4.
5.
General Information . . . . . . . . . . . . . . 2
Trip Unit Installation. . . . . . . . . . . . . . . 2
Trip Unit Controls and Functions. . . . . 5
Neutral Current Sensor Information.. . 7
100% Rated LD and MDL Frame
Circuit Breakers. . . . . . . . . . . . . . . . . . 7
Instruction Leaflet for the
LES/MES 310+ Electronic Trip Unit

Instruction Leaflet IL012043EN
Effective January 2016
WARNING
DO NOT ATTEMPT TO INSTALL OR PERFORM MAINTENANCE ON EQUIPMENT WHILE IT IS ENERGIZED. DEATH OR SEVERE PERSONAL INJURY
CAN RESULT FROM CONTACT WITH ENERGIZED EQUIPMENT. ALWAYS
VERIFY THAT NO VOLTAGE IS PRESENT BEFORE PROCEEDING.
Section 1: General Information
Step 2
Remove the 2 retaining screws (3 for 4-pole breaker) from the shunt
plate inserts in the base of the circuit breaker frame.
Step 3 (4-pole Only)
Plug the current sensor secondary winding connector into the receptacle in the side of the trip unit. Either polarity is acceptable since
the secondary winding connector is not polarized.
Table 1. Parts List
L OR M 310+ ELECTRONIC TRIP UNIT
Trip Unit
IL FOR 310+ ELECTRONIC TRIP UNITS
Secondary
Winding
Connector
NEUTRAL CURRENT SENSOR (GROUND FAULT ONLY)
NEUTRAL & ALARM LEADS (GROUND FAULT ONLY)
4TH POLE CT ASSEMBLY (4 POLE ONLY)
Current
Sensor
Section 2. Trip Unit Installation
Step 1
Remove the 8 screws (10 for MDL-frame) holding the base and cover
together (Figure 1).
Figure 2. 4th Pole Installation.
Step 4
Position the retaining screws in the trip unit and current sensor conductor holes (Figure 3).
Figure 3. Retaining Screws Location in Trip Unit.
Figure 1. LES Base-cover Screws.
2
EATON www.eaton.com
Instruction Leaflet for the
LES/MES 310+ Electronic Trip Unit
Instruction Leaflet IL012043EN
Effective January 2016

Step 5
Step 6
If present on the trip unit, route wires through the slots on the
breaker frame's side (Figure 4).
Starting with the center pole (mech pole), tighten the three retaining
screws in the trip unit and the fourth retaining screw in the current
sensor. Torque to 10 – 12 lb.-ft. (14 – 16 N·m) (Figure 6).
 CAUTION
DO NOT EXCEED A TORQUE OF 10 – 12 LB.-FT. (14 – 16 N.m.). EXCESSIVE
TORQUING WILL SHEAR THE SCREWS. FAILURE TO APPLY THE REQUIRED
TORQUE MAY LEAD TO EXCESSIVE HEATING AND CAUSE NUISANCE
TRIPPING OF THE CIRCUIT BREAKER.
Line End
Trip Unit Retaining Screws
Torque 10-12 lb-ft, 3 x
(14-16 N·m.)
Test Port
Trip Unit
NNote: Wires for optional features only.
Figure 4. Wire Routing Tunnels on Breaker Base.
Pull wiring harnesses through slots in frame until the cable ties
reach the location shown in Figure 5. Cable ties positioned below
this location can result in an interference with the circuit breaker
cover during assembly. It is not possible to have leads of wiring harnesses exit opposite sides of the breaker.
Load End
Figure 6. LES Trip Unit Mounting Screw Locations.
Line End
Trip Unit Retaining Screws
Torque 10-12 lb-ft, 4 x
(14-16 N·m.)
Cable Ties
Test Port
Trip Unit
Load End
Breaker Frame
Figure 7. LES 4-pole Trip Unit Mounting Screw Locations.
Wiring
Harnesses
Figure 5. Wire Routing Cable Tie Placement.
EATON www.eaton.com
3
Instruction Leaflet for the
LES/MES 310+ Electronic Trip Unit

Instruction Leaflet IL012043EN
Effective January 2016
Step 7 (MES Trip Units)
Step 9
Starting with the center pole (mech pole), torque line side screws to
10-12 lb.-ft. (14-16 N·m) and load side screws to 6 – 8 lb.-ft.
(8 – 10 N·m) (Figure 8).
Finish the installation by installing the cover on the base, as shown
in Figure 10.
TORQUE 18-23 LB-IN 8X
(2.0-2.6 N.m.)
Line End
Trip Unit Retaining Screws
Torque 10-12 lb-ft, 3 x
(14-16 N·m.)
Test Port
Trip Unit
Torque 6-8
lb-ft, 6 x
(8-10 N·m.)
Load End
Figure 8. MES Trip Unit Mounting Screw Locations.
Step 8.
Install any accessories, if required, using the appropriate instruction
leaflet.
The following types of internal accessories, which mount on the trip
unit, are available for use. The number of the IL covering the installation of each accessory is shown.
•
Alarm (Signal)/Lockout (ASL) Switch..............................I.L. 29C183
•
Auxiliary Switch..............................................................I.L. 29C123
•
Shunt Trip........................................................................I.L. 29C146
•
Low Energy Shunt Trip...................................................I.L. 29C147
•
Undervoltage Release Mechanism (Handle Reset).......I.L. 29C170
Trip Unit Wire Routings with Accessories:
•
Alarm (Signal)/Lockout (ASL) Switch and Auxiliary Switch:
From trip unit, route wiring harnesses through the recessed center portion of the accessory bracket and through the slots in the
breaker frame.
•
Shunt Trip:
From trip unit, route wiring harnesses through the recessed center portion of the accessory bracket overlapping the white and
yellow accessory wires, over the shunt trip, and through the slots
in the breaker frame.
•
Low Energy Shunt Trip and Undervoltage Release Mechanism
(Handle Reset):
From trip unit, route wiring harnesses under accessory bracket
and through the slots in the breaker frame.
4
EATON www.eaton.com
Figure 9. Re-attach Cover and Base of the Breaker.
Instruction Leaflet for the
LES/MES 310+ Electronic Trip Unit
Instruction Leaflet IL012043EN
Effective January 2016

Section 3. Trip Unit Controls and Functions
Ir Settings
A. Trip unit controls and settings (refer to Figures 10 and 11).
LES
MES
A = 250A
A = 320A
B = 300A
B = 400A
C = 315A
C = 450A
D = 350A
D = 500A
E = 400A
E = 600A
F = 450A
F = 630A
G = 500A
G = 700A
H = 600A = In
H = 800A = In
10
2
TEST / ALARM
STATUS
r
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Push To Trip
C
B
6636C85H21
D E F
A
G
H
3
1
LONG
10 12 15
7
20
4
24
2
4
3
SHORT
5 6 7
8
2
4
LS
5
*Settings
tsd
(ms)
tg (ms)
Inst.
120
300
Inst.
J
K
L
120
M
n
O
300
P
Q
R
Figure 11. LSIG Short Delay and Ground Fault Time Settings.
10
2
STATUS
TEST / ALARM
Push To Trip
C
B
6636C85H22
D E F
A
1
G
H
3
LONG
10 12 15
7
20
4
24
2
SHORT
5 6 7
4
3
120 SHORT
5
2
STATUS
TEST / ALARM
6636C85H23
A
1
G
H
3
LONG
10 12 15
7
20
4
24
2
4
3
SHORT
5 6 7
C
B
5
STATUS
TEST / ALARM
1
G
H
3
4
3
SHORT
5 6 7
10
STATUS
8
2
4
300
LSG
6
GND
.6 .8 1.0
.4
.3
.2
SHORT/GND
M N O
P
L
Q
K
J
R
5
15
LSIG
2
C
B
6636C85H25
A
1
G
H
3
4
3
SHORT
5 6 7
4
10
STATUS
120
5
15
7
2
REMOTE MM TEST / ALARM
C
B
6636C85H26
1
A
3
G
H
LONG
10 12 15
7
20
4
24
2
4
4
3
SHORT
5 6 7
2
5
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300
INST
Push To Trip
D E F
SHORT
8
2
8
3.Ir - Continuous current setting. In accordance with standards
requirements, the trip unit initiates a trip of the circuit breaker
within 2 hours for an overload of 135% and will trip as a function
of l²t for higher currents. Continuous current values for each lettered setting are indicated by the chart displayed on the left side
of the trip unit label.
4.tr - The number of seconds required to trip @ 6x Ir. For example,
if Ir = 250A, tr = 2 sec, and load current = 1500A, or 6x Ir, then
the breaker will trip in 2 seconds.
NNote: In addition to the short delay trip function, there is a fixed instantaneous override for the 600A and 800A trip units. The override for the
600A is fixed at 5620A, the override for the 800A is fixed at 6800A. If a
fault current exceeds these override values, the breaker will trip instantaneously (in 20 milliseconds or less).
6. Ig - Ground fault pick-up setting. It is used on the LSIG and LSG
styles to set the ground fault pick-up as a percentage of In (frame
current). For example, a 600A frame with an Ig setting of 0.4 will
provide a ground fault pick-up at 240A.
REMOTE MM TEST / ALARM
LONG
10 12 15
7
20
4
24
2
2. Test/Alarm LED - A dual function, bi-color (red-amber) LED. It is
used as an amber no trip indicator when using the test port. In
normal modes, the red LED indicates a high load alarm. For a
high load alarm, it will blink ON-OFF if the continuous current is
105% of the Ir setting and is present for a duration over 38 seconds.
5.lsd - Setting in multiples of lr for short circuit conditions that
exceed the short delay pick-up setting, the trip unit initiates a trip
after a predetermined delay.
r
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8
Push To Trip
D E F
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9
2
LONG
10 12 15
7
20
4
24
2
GND
INST
10
A
GND
.6 .8 1.0
.4
.3
.2
120
Push To Trip
6636C85H24
6
8
2
4
D E F
LSI
7
10
D E F
300
INST
Push To Trip
C
B
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8
2
4
1. Test Port - A test port is built into each trip unit to allow use of a
functional test kit. The test kit performs a test of the Long Delay,
Short Delay and Ground Fault functions (Plug-In Test Kit Catalog
#MTST230V). Remove the test port cover prior to connecting to
the test port.
LSI+ Remote MM
6
GND
.6 .8 1.0
.4
.3
.2
SHORT/GND
M N O
P
L
Q
K
J
R
8
Figure 10. LES / MES Trip Units Settings.
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LSIG+ Remote MM
7. tsd - for the LSI style, the short delay time is a flat response
determined by the tsd switch settings of INST 120ms, or 300ms.
For the LS styles, the short delay time is an I²t function, with a
delay of 67ms at a Isd setting of 6x.
8.tsd / tg - For the LSIG style, the short delay is a flat response
determined by the tsd/tg switch settings of INST 120ms or
300ms. This switch is a dual switch that also determines the
ground fault time settings of INST, 120ms or 300ms. For example, if the tsd/tg switch is set at position J, then both short delay
time and ground fault time are at INST flat. As another example,
set the tsd/tg switch at position L; the short delay time is INST
and the ground fault time is 300ms. The LSIG label (Figure 11)
should be used in conjunction with the tsd/tg switch to set any
one of nine possible combinations of short delay and ground
fault times.
9.tg - For the LSG style, the short delay time is an I²t function
while the ground fault flat time is set by the tg switch.
10.Status LED - A green status light indicates the operational status
of the trip unit. If the load current exceeds approximately 20%
of the maximum current rating (In) of the breaker, the status light
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5
Instruction Leaflet for the
LES/MES 310+ Electronic Trip Unit

Instruction Leaflet IL012043EN
Effective January 2016
will blink on for one second and off for one second.
B. Other features and options of the LES/MES 310+ trip units.
1. The High Load Alarm Relay option will provide a SPST contact
closure when the trip unit current equals or is greater than 105%
of In for a period of 38 seconds. If the current drops below the
105% value, the contact will open. The yellow and green wires
that exit the right side of the breaker are the common (C) and
normally open (NO) of this relay (See Figure 12).
2. The Ground Fault Alarm Only option operates in a similar fashion as the High Load Alarm. The SPST contact will close if the
ground fault pick-up setting is exceeded and will open when
below the ground fault pick-up setting. The yellow and green
wires that exit the right side of the breaker are the common (C)
and normally open (NO) of this relay (See Figure 12).
Upstream
INST
120ms
300ms
INST
Both
Dn 43ms
Dn 43ms
120ms
Both
Dn 52ms
Dn 52ms
300ms
Both
Dn 43ms
Dn 43ms
NNote: The High Load Alarm Relay can be selected with LS, LSI LSG, and
LSIG trip units. For the LSG and LSIG trip units, the High Load Alarm will
function normally. However, if the breaker trips due to a ground fault condition, the relay will respond with a ground fault alarm as indicated above.
NNote: A single breaker with the Zone Selective Interlocking feature enabled
will not trip at the programmed time settings, unless Self Interlocked. That is,
the Zout wire should be connected to the Zin wire.
The Ground Fault Alarm Only can be selected for LSG and LSIG
trip units only. This selection has precedence over all other relay
functions. When the Ground Fault Alarm Only is selected, the
High Load Alarm Relay feature is not available.
5. Remote Maintenance Mode (RMM) is an option that allows a
user to remotely lower the instantaneous pickup of the breaker
to 2.5x the frame rating (In), and to bypass any programmed
delays (tsd or tg). The purpose of the function is to to reduce incident energy during a fault condition.
NNote: The contact ratings of the relay are: 2A at 30 VDC and 0.5 A at
125 VAC.
4. The Zone Selective Interlock (ZSI) option provides a wired method of coordinating Upstream and Downstream breakers. The
coordinating signals are provided by the White\Red stripe (Zin),
White\Black stripe (Zout), and Black (common ground) wires that
exit the right side of the breaker. ZSI may be ordered on LSI and
LSIG trip units.
Zone Selective Interlocking is active for the short delay and
the ground fault delay tripping functions. The LES/MES 310+
Trip Unit Zone Selective Interlocking feature is compatible with
OPTIM and Digitrip Trip Units, including all other 310+ models on
Series G: (RG, NG LG, JG) and Series C (FD and KD) breakers.
Three wires exit the breaker with the following color code and
function: White/Black Stripe=Zone Out, White/Red Stripe=Zone
In, and Black=Common (See Figure 12).
A typical connection for a two breaker system is accomplished
by connecting the Zout wire of the downstream breaker to the Zin
of the upstream breaker. The common black wires of both breakers must also be connected.
If a high current fault is sensed from the load on the downstream breaker, both breakers will sense the fault. However,
the downstream breaker will send the interlock signal to the
upstream breaker informing it not to trip. This delay allows the
downstream breaker to clear the fault without the upstream
breaker tripping.
However, if for some reason the downstream breaker does not
clear the fault in the set delay time, the upstream breaker will
then clear the fault at or before its defined tsd or tg.
6
Downstream
3. The Ground Fault Relay option will provide a SPST contact closure immediately before the breaker will trip on a ground fault
over current detect. This closure is momentary (50ms) and the
customer must provide the necessary external circuitry in order
to latch this signal. The yellow and green wires that exit the right
side of the breaker are the common (C) and normally open (NO)
of this relay (See Figure 12).
Multiple breakers may be connected in a system to create a
zone of protection. For faults outside the zone of protection, the
trip unit of the circuit breaker nearest the fault sends an interlocking signal (Zout) to the trip unit of the up-stream circuit breaker. (Zin) This interlocking signal restrains immediate tripping of the
upstream circuit breaker until its programmed coordination time
is reached. Thus zone selective interlocking applied correctly
can reduce damage due to circuit or ground fault conditions. A
table of the settings of the two breakers with the respective
outcomes (Both Trip or Downstream (Dn) Trips) of the breakers is
indicated below for the conditions mentioned in the table heading.
EATON www.eaton.com
For example, a 600A (In) LD breaker with the switch set to 2.5x
would trip instantaneously when the current exceeded 1500 A.
The RMM is enabled by applying 24VDC to the two wire cable
that exits the left side of the breaker. The wires are color coded
Yellow (+24V) and Black (common ground) - see Figure 14. A
blue colored LED on the trip unit lights when the breaker is in
RMM (Figure 13).
The lighted blue LED indicates that RMM is enabled. This setting
corresponds to 2.5x of In. Turning the Isd switch on the trip unit
has no effect on either the Maintenance Mode or the tsd\tg settings while the blue LED is lit.
Also, a relay contact closure indicates that the RMM has been
enabled. The blue and red wires are the C and NO contacts of
this relay. The relay has a dual function: 1) enable RMM and 2)
provide a contact closure indication that RMM is enabled.
Both the yellow and black set of wires and the red and blue set
of wires exit on the left side of the breaker.
NNote: The RMM contacts are rated at 2A at 30 VDC and 0.5A at 125
VAC.
Instruction Leaflet for the
LES/MES 310+ Electronic Trip Unit
Instruction Leaflet IL012043EN
Effective January 2016

Section 4. Neutral Current Sensor Information.
K2
1
+
10
-
ALARM
RELAY
2
2
NC1
D7
NRD4004
3
W1
1
NO1
4
9
NC2
J7-8
GRN
J7-7
YEL
8
W2
NO2 7
CONT 2A 24VDC
TQ2SA-24V
ZSI
ZOUT
N.C.
ZIN
J7-5
BLK
J7-1
WHI/BLK STRIPE
J7-2
N.C.
J7-3
NOTICE
WHI/RED STRIPE
NEUTRAL
J7-4
GRY
J7-6
WHI
8-POS "PHD" RA
Ground fault trip units are supplied from the factory with pigtail
lead connections for a neutral current sensor (white and grey
wires). A neutral current sensor shown in Figure 14 is available.
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 should be cut off before installation. If the system neutral
is grounded and phase to neutral loads are used, then the neutral
current sensor must be used. It should be connected to the breaker
according to Figure 15 It has the same turns ratio as the phase current sensors in the trip unit.
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 TESTS TO COMPLY WITH NATIONAL
ELECTRIC CODE REQUIREMENTS UNDER ARTICLE 230-95-C.
NNote: 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 previously.
CABLE
Figure 12. Alarm, ZSI, and Neutral Wiring Diagram.
 CAUTION
LEADS COULD BE DAMAGED IF IN CONTACT WITH MOVING PARTS.
ACCESSORY WIRES SHOULD BE FORMED AND ROUTED TO CLEAR ALL
MOVING PARTS.
K1
7
NO2
8
W2
3
W1
Leads to be routed:
NC2 9
4
1. 2 leads (white and grey) for the neutral current sensor.
2. 2 leads (yellow and green) for the ground fault alarm relay
It is not possible to have leads exiting the breaker on the opposite
side. For rear exiting leads, thread the leads through the wiring
troughs/tunnels in the side of the circuit breaker case. For side
exiting leads, use the slots in the side of the case. Use 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).
NO1
NC1
2
10
1
+
CONT 2A 24VDC
Any other leads to be brought out should then be threaded through
the wiring trough closest to the trip unit.
10.0K
1/16W 1%
REMOTE
MAINT.
MODE
2
BLK
RMM CONTACTS
BLUE T-1
1
YEL
1
2
NRD4004
2
RED
1
BLU
MMSZ4703
16V 5%
Section 5. 100% Rated LD and MDL Frame
Circuit Breakers
CLD, CHLD, CLDC, CMDL, and CHMDL circuit breakers are suitable
for continuous operation at 100% of the frame rating if used with
CU only 90° C insulated wire and AL9CU terminals in an enclosure
which measures at least 24” high x 15” wide x 6” deep for the LD
and 42" high x 18" wide x 7.5" deep for the MDL. Ventilation is not
required in an enclosure having these minimum dimensions.
Figure 13. Remote Maintenance Mode Wiring Diagram.
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7
Instruction Leaflet for the
LES/MES 310+ Electronic Trip Unit

Instruction Leaflet IL012043EN
Effective January 2016
1.50 AT TOP
[38,1]
.03
[0,76]
2X Ø .280
[7,11]
THRU HOLE
.50
4X R .36
[9,14]
[12,70]
POLARITY MARKINGS
.31
[7,87]
( 2.000 )
([50,80])
.25
[6,35]
( 1.000 )
([25,40])
1.47
[37,34]
( .617 )
([15.67])
1.44
[36.58]
4X R .28
[7,11]
( 4.376 )
([111,13])
5.610
[142.49]
1/2" BOLTS
(NOT INCLUDED)
.50
12,70]
2.188
[55,58]
T/POTTING
T/CONDUCTOR
5.69 AT TOP
[144,53]
1.188
[30,18]
1.17
[29,72]
5.75 AT BASE
[146,05]
2.25
[57,15]
2.25 AT TOP
[57,15]
2.33 AT BASE
[59,18]
2.91 AT BASE
[73,91]
Figure 14. Neutral Current Sensor.
The information, recommendations, descriptions, and safety notations in this document are based on Eaton’s experience and judgment with respect to Retrofitting of Power Breakers. This instructional literature 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.
Figure 15. Neutral and Alarm Wiring Diagram.
Eaton
Electrical Sector
1000 Eaton Boulevard
Cleveland, OH 44122
United States
877-ETN-CARE (877-386-2273)
Eaton.com
© 2016 Eaton
All Rights Reserved
Printed in USA
Publication No. IL012043EN / TBG001166
Part Number: IL012043ENH03
January 2016
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.
Eaton is a registered trademark.
All other trademarks are property of their
respective owners.