Series NRX Low Voltage Power
(Air) Circuit Breakers User Manual
Instructions apply to:
Series NRX, Type RF Frame
IEC, IZMX40
4000 NRX RF DRAWOUT SUBTITLE IMAGE (12/15/2010)
effective July 2011 Series NRXInstructional Book MN01301003E
Typical Drawout Circuit
Breaker and Cassette
2
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
Contents
Description Page
Contents 2
List of figures 2
List of tables 3
Section 1: Introduction 4
Section 2: Receiving, unpacking, and inspection 13
Section 3: Breaker General Operation 16
Section 4: Circuit Breaker Features and Accessories 21
Section 5: Dimensional Drawings for Installation of Drawout Circuit Breaker and Cassette 28
Section 6: Inspection and Maintenance 44
Section 7: Troubleshooting 47
List of gures
Figure 1. Series NRX Nameplate Location 5
Figure 2. Series NRX Catalog Numbering System 6
Figure2a. Series NRX Type RF-Frame Cassette Catalog Numbering System 8
Figure 3. Typical NRX Drawout Circuit Breaker 9
Figure 4. Typical NRX Drawout Cassette 10
Figure 5. Typical NRX Fixed Circuit Breaker 11
Figure 6. Typical NRX Drawout Circuit Breaker Front Cover 12
Figure 7. Step 1 13
Figure 8. Step 3 13
Figure 9. Step 3 15
Figure 10. Step 1 16
Figure 11. Step 2 16
Figure 12. Step 3 16
Figure 13. Step 4 17
Figure 14. WITHDRAWN Position 17
Figure 15. DISCONNECT Position 17
Figure 16. TEST Position 18
Figure 17. CONNECT Position 18
Figure 18. Step 2 18
Figure 18a. Step 2 18
Figure 19. Step 3 19
Figure 20. Step 4 19
Figure 21. Step 1 19
Figure 22. Step 2 20
Figure 23. Step 3 20
Figure 24. Step 3 20
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Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
List of gures (continued)
Description Page
Figure 25. Installed Digitrip 520 Trip Unit 21
Figure 26. Secondary Point Identifications 22
Figure 27. Secondary Terminal Blocks 23
Figure 28. Weidmuller Plug and Crimp Contact 24
Figure 29. Extraction Tool in Use 24
Figure 30. Left Accessory Tray 24
Figure 31. Right Accessory Tray 24
Figure 32. 3-Pole Drawout Cassette – Rear/Bottom Views 28
Figure 33. 3-Pole Drawout Cassette – CONNECTED/TEST Positions 29
Figure 34. 3-Pole Drawout Cassette – DISCONNECT/WITHDRAWN 30
Figure 35. 3-Pole Drawout Cassette – Top/Side Views with 800-3200A Horizontal Bus Adapters 31
Figure 36. 3-Pole Drawout Cassette – Top/Side Views with 800-3200A Vertical Bus Adapters 32
Figure 37. 3-Pole Drawout Cassette – Top/Side Views with 4000A Horizontal Bus Adapters 33
Figure 38. 3-Pole Drawout Cassette – Top/Side Views with 4000A Vertical Bus Adapters 34
Figure 39. 3-Pole Drawout Cassette – Front View Door Cutout Details 35
Figure 40. 4-Pole Drawout Cassette – Rear/Bottom Views 36
Figure 41. 4-Pole Drawout Cassette – CONNECTED/TEST Positions 37
Figure 42. 4-Pole Drawout Cassette – DISCONNECT/WITHDRAWN 38
Figure 43. 4-Pole Drawout Cassette – Top/Side Views with 800-3200A Horizontal Bus Adapters 39
Figure 44. 4-Pole Drawout Cassette – Top/Side Views with 800-3200A Vertical Bus Adapters 40
Figure 45. 4-Pole Drawout Cassette – Top/Side Views with 4000A Horizontal Bus Adapters 41
Figure 46. 4-Pole Drawout Cassette – Top/Side Views with 4000A Vertical Bus Adapters 42
Figure 47. 4-Pole Drawout Cassette – Front View Door Cutout Details 43
Figure 48. Typical Nameplate Information 45
Figure 49. Step 1 46
Figure 50. Step 2 46
Figure 51. Step 4 46
List of tables
Description Page
Table 1. Transport Indicator 13
Table 2. Suggested Lifting Procedures and Precautions 14
Table 3. Approximate Weights 15
Table 4. Series NRX Digitrip Trip Units 21
Table 5. Customer Wiring Details 23
Table 6. Inspection Frequency 44
Table 7. Circuit Breaker Troubleshooting Guide 47
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Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
Section 1: Introduction
Purpose
This instructional manual is intended to generally cover the installation,
operation, and maintenance of Series NRX
TM
low voltage power (air)
circuit breakers and drawout cassettes. Basic dimensional information
is provided for the installation of both the circuit breaker and cassette.
Refer to other documentation for more specific details.
1. IL01301051E: Digitrip 520 Trip Unit
2. AD01301004E: Digitrip 520 Time Current Curves
3. IL01301064E: Digitrip 1150 Trip Unit
4. AD01301005E: Digitrip 1150 Time Current Curves
5. TD01301014E: Wiring Diagrams
6. Accessory field installation instruction leaflets (IL) dedicated to specific
items are available for download at www.eaton.com/seriesnrx.
7. Visit www.eaton.com/seriesnrx for additional support documentation.
Safety
All safety codes, safety standards, and/or regulations must be strictly
observed in the installation, operation, and maintenance of this
equipment.
WARNING
THE WARNINGS AND CAUTIONS INCLUDED AS PART OF THE PROCEDURAL
STEPS IN THIS MANUAL ARE FOR PERSONNEL SAFETY AND PROTECTION
OF EQUIPMENT FROM DAMAGE. THIS EXAMPLE OF A TYPICAL WARNING
IS INTENDED TO FAMILIARIZE PERSONNEL WITH THE STYLE OF
PRESENTATION.
IMPORTANT
PLEASE READ AND UNDERSTAND THESE INSTRUCTIONS BEFORE
ATTEMPTING TO UNPACK, INSTALL, OPERATE, OR MAINTAIN THIS
EQUIPMENT. STUDY THE BREAKER AND ITS MECHANISM CAREFULLY
BEFORE ATTEMPTING TO OPERATE IT ON AN
ENERGIZED CIRCUIT.
All possible contingencies that may arise during installation, operation,
or maintenance, and all details and variations of this equipment do
not purport to be covered by these instructions. If further information
is desired by purchaser regarding a particular installation, operation,
or maintenance of particular equipment, contact the local Eaton
representative.
WARNING
SERIES NRX CIRCUIT BREAKERS ARE PROVIDED WITH SAFETY FEATURES,
NEVERTHELESS, THE VOLTAGES, CURRENTS, AND POWER LEVELS AVAILABLE
AROUND OPERATIONAL EQUIPMENT ARE EXTREMELY DANGEROUS. UNDER
NO CIRCUMSTANCES SHOULD INTERLOCKS AND OTHER SAFETY FEATURES
BE MADE INOPERATIVE, AS THIS MAY RESULT IN DEATH, BODILY INJURY, OR
PROPERTY DAMAGE.
Safe practices
To protect personnel associated with the installation, operation, and
maintenance of this equipment, the following practices must be
followed:
1. Only qualified electrical personnel familiar with the equipment, its
operation, and the associated hazards should be permitted to work on,
install, or operate the equipment.
2. Always be certain that the primary and secondary circuits are
de-energized or the circuit breaker is open and removed to a safe work
location before attempting any maintenance.
3. For maximum safety, only insert an open, completely assembled
breaker into an energized cell.
4. Always ensure that drawout circuit breakers are in one of their designed
cell positions, such as CONNECT, TEST, DISCONNECT, or WITHDRAWN.
A circuit breaker permitted to remain in an intermediate position could
result in control circuits being improperly connected, resulting in
electrical failures.
Qualified personnel
For the purpose of operating and maintaining power circuit breakers,
a person should not be considered qualified if the individual is not
thoroughly trained in the operation of the circuit breaker and how
it interfaces with the assembly in which it is used. In addition, the
individual should have knowledge of the connected loads.
For the purpose of installing and inspecting circuit breakers and their
associated assembly, a qualified person should also be trained with
respect to the hazards inherent to working with electricity and the
proper way to perform such work. The individual should be able to
de-energize, clear, and tag circuits in accordance with established
safety practices.
General information
The Series NRX range of low voltage power (air) circuit breakers and
switch-disconnectors are designed, manufactured, and tested for use
in both switchboard and metal-enclosed switchgear assemblies in
accordance with IEC 60947-2 requirements. The Series NRX range is
manufactured and tested in an ISO 9002 certified facility.
Series NRX circuit breakers and switch-disconnectors are available
in fixed and drawout mounting configurations and offer a variety of
different connection solutions. The fixed configuration is designed
for front/rear bus connections. The drawout version, in conjunction
with its drawout cassette, is a through-the-door design having three
breaker positions with the compartment door closed (CONNECT, TEST,
DISCONNECT) and one position out of its compartment on extension
rails (WITHDRAWN). A drawout cassette is also designed for front/
rear bus connections. Continuous current ratings from 800–4000A
and interruption capacities up to 105 kA are available depending on the
applicable standard. All Series NRX circuit breakers are 100 percent
rated.
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Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Product Labeling and Identification
The circuit breaker nameplate, located on the right side of the breaker,
provides complete rating information and should always be inspected
to ensure the information shown is in keeping with the product
ordered (Figure 1). Become familiar with the nameplate.
WARNING
SERIES NRX CIRCUIT BREAKERS SHOULD NOT UNDER ANY CIRCUMSTANCES
BE APPLIED OUTSIDE THEIR NAMEPLATE RATINGS. OPERATION OUTSIDE OF
THESE RATINGS COULD RESULT IN DEATH, BODILY INJURY, OR PROPERTY
DAMAGE.
,V
,V
,V,V
,V
Frame Type
Product Coding
Applicable Rating Plug Group
Standards
Poles
Max rated current of the frame
Max rated voltage and
frequency
Rated operational voltage
Rated short-circuit breaker capacity (service)
Rated short-circuit breaker capacity (ultimate)
Rated short time withstand
Third party
certification markings
Factory installed
accessories
Mnf. barcode
Breaker manual
(EN)
20-digit catalog string
Additional third party
markings
Mnf. location
Order information
Mnf. date code
(YYMMDD)
Rated insulation voltage
Rated impulse withstand
voltage
Direction for use
in IT system
Utilization category
Disconnected function
Figure 1. Series NRX Nameplate Location
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Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
The circuit breaker can be identified by a 20-digit catalog number located on the name plate (Figure 2). The drawout cassette can be identified by
a 14-digit catalog number (Figure 2a). An overview of the Catalog number code is provided for reference.
Figure 2. Series NRX Catalog Numbering System (continued on next page)
Series NRX Breaker Catalog Numbering System
Basic Device Selection Overcurrent Protection Breaker Options
(Postion 1-8) (Postion 9-11) (Postion 12-20)
Positions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Example R E S 8 4 0 3 W 5 2 G A B A N 4 X N D X
Position 1 Breaker Frame Size
N Type NF 630 to 1600A
R Type RF 800 to 4000A
Position 2 Industry Standard
E IEC 60947-2
Position 3, 4 Switching Capacity
S4 42kA at 440Vac IEC
S5 65kA at 440Vac IEC
S6 65 / 66kA at 440Vac IEC
S8 85kA at 440Vac IEC
SC 105kA at 440Vac IEC
Position 5, 6 Rated Operational Current
07 630A Frame
08 800A Frame
10 1000A Frame
13 1250A Frame
16 1600A Frame
20 2000A Frame
25 2500A Frame
32 3200A Frame
40 4000A Frame
Position 7 Poles & Phasing
3 3-Pole ABC
4 4-Pole NABC
Position 8 Mounting Config.
W Drawout
B Fixed
Electronic Trip Unit Selection Protection ZSI ARMS Position
9-10
No Protection - Switch Disconnector
None SW
Digitrip 520 - System Protection
LI protection only LI 22
Digitrip 520 - Selective Protection
LSI -- 52
LSI(G) LSI ZSI 53
-ZSI Optional LSIG -- 5G
LSIG ZSI 5H
Digitrip 520M - Universal Protection
LSI -- -- M2
LSI(G/A) LSI ZSI -- M3
- Metering LSIA -- -- MA
- Communications Ready LSIA ZSI -- MB
- Ext. Power Ready 24Vdc LSIG -- -- MG
- ZSI Optional LSIG ZSI -- MH
- ARMS Optional LSI -- ARMS R2
LSI ZSI ARMS R3
LSIA -- ARMS RA
LSIA ZSI ARMS RB
LSIG -- ARMS RG
LSIG ZSI ARMS RH
Digitrip 1150i - Power Measurement
LSI -- -- 12
520M Proection + LCD Color Display LSI ZSI -- 13
Advanced metering & protective features LSIGA -- -- 14
LSIGA ZSI -- 15
LSI -- ARMS 16
LSI ZSI ARMS 17
LSIGA -- ARMS 18
LSIGA ZSI ARMS 19
Position 11 Rating Plug (Amperes)
0 Non-Auto Switch
1 200
2 250
3 300
4 400
8 800
A 1000
C 1250
D 1600
M 2000
N 2500
Q 3200
R 4000
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Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Position 12 Shunt Trip
N No Shunt Trip
A 110-127 VAC/DC
R 208-240 VAC/DC
L 24 VDC
H 48 VDC
S 60 VDC
Position 13 Motor Operator
M Manually Operated
B 110-125 VAC/DC
T 208-250 VAC/DC
L 24VDC
H 48VDC
S 60VDC
Position 14 Spring Release Latch Check Switch
N No Spring Release No LCS
A 110-127 VAC/DC No LCS
B 110-127 VAC/DC Spring Release LCS
C 110-127 VAC/DC LCS Wired External
R 208-240 VAC/DC No LCS
S 208-240 VAC/DC Spring Release LCS
T 208-240 VAC/DC LCS Wired External
L 24 VDC No LCS
P 24 VDC Spring Release LCS
Q 24 VDC LCS Wired External
H 48 VDC No LCS
J 48 VDC Spring Release LCS
K 48 VDC LCS Wired External
1 60 VDC No LCS
2 60 VDC Spring Release LCS
3 60 VDC LCS Wired External
Position 15 UVR, Second Shunt Trip
N None
A 110-125 VAC/DC UVR
R 220-250 VAC/DC UVR
L 24 VDC UVR
H 48 VDC UVR
S 60 VDC UVR
G 32 VDC UVR
1 110-127 VAC/DC Second Shunt Trip
2 208-240 VAC/DC Second Shunt Trip
4 24 VDC Second Shunt Trip
8 48 VDC Second Shunt Trip
9 60 VDC Second Shunt Trip
Position 16 Auxiliary Switches
N No Aux Switches
2 2 Form C (2a/2b)
4 4 Form C (4a/4b)
6 6 Form C (6a/6b)
8 8 Form C (8a/8b)
A 10 Form C (10a/10b)
W 12 Form C (12a/12b)
Position 17 Trip Bell Alarm/ Secondary Remote
Indicator OTS Terminal Blocks Reset
N None None Per Breaker Options none
X Trip Indicator None Per Breaker Options none
Z Trip Indicator 2 Form C Per Breaker Options none
M Interlock Trip Indicator None Per Breaker Options none
A Interlock Trip Indicator None Per Breaker Options 24Vdc
B Interlock Trip Indicator None Per Breaker Options 120Vac
C Interlock Trip Indicator None Per Breaker Options 240Vac
Y Interlock Trip Indicator 2 Form C Per Breaker Options none
D Interlock Trip Indicator 2 Form C Per Breaker Options 24V RR
E Interlock Trip Indicator 2 Form C Per Breaker Options 120V RR
F Interlock Trip Indicator 2 Form C Per Breaker Options 240V RR
1 None None Full-Compliment No RR
2 Trip Indicator None Full-Compliment No RR
3 Trip Indicator 2 Form C Full-Compliment No RR
4 Interlock Trip Indicator No OTS Full-Compliment No RR
J Interlock Trip Indicator No OTS Full-Compliment 24V RR
K Interlock Trip Indicator No OTS Full-Compliment 120V RR
L Interlock Trip Indicator No OTS Full-Compliment 240V RR
5 Interlock Trip Indicator 2 Form C Full-Compliment No RR
R Interlock Trip Indicator 2 Form C Full-Compliment 24V RR
S Interlock Trip Indicator 2 Form C Full-Compliment 120V RR
T Interlock Trip Indicator 2 Form C Full-Compliment 240V RR
Position 18 PadLocking, Operations Counter
N No PB Covers No Counter
A No PB Covers Counter Provided
B PB Covers (plastic/plastic) No Counter
J PB Covers (plastic/plastic) Counter Provided
K PB Covers, (metal/metal) No Counter
L PB Covers, (metal/metal) Counter Provided
5 PB Covers, (metal/metal), Safe-Off No Counter
6 PB Covers, (metal/metal), Safe-Off Counter Provided
Position 19 Drawout Breaker Options
Breaker configuration Shutters Terminal Adapters
D Drawout Breaker Shipping Alone n/a n/a
C Drawout Breaker in Cassette none No Terminals
1 Drawout Breaker in Cassette none Vertical
2 Drawout Breaker in Cassette none Horizontal
8 Drawout Breaker in Cassette none Front Connect
j
9 Drawout Breaker in Cassette Shutters No Terminals
4 Drawout Breaker in Cassette Shutters Vertical
5 Drawout Breaker in Cassette Shutters Horizontal
7 Drawout Breaker in Cassette Shutters Front Connect j
Fixed-Mount - Terminal Adapter Options
K None (Terminals recomended for 4000A frame)
F Vertical
H Horizontal
B Front Connect
Position 20
X Future
j Terminals ship as kit with breaker and cassette (option not available with 4000A Frame Rating)
Series NRX Breaker Catalog Numbering System
Figure 2. Series NRX Catalog Numbering System (continued from previous page)
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Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
RF Cassette Catalog Numbering System
Positions
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Position 1-2 Cassette Family and Breaker Frame
RE IEC RF-Frame
Position 3-4 Continuous Ampere Range
40 RF-Frame 2000-4000A
Position 5 Poles, Phasing (Facing Front of Breaker)
3 Three-pole ABC
4 Four-pole NABC
Position 6 Load Terminal Connections
N Flat tapped pads only (no terminal adapters)
F Flat bar front, except 4000A
V Vertical
H Horizontal
Position 7 Arc Hood
A Arc hood installed (default)
Position 8 Door Frame Gasket and Rejection Kits
B Door kit included (default), with rejection kit
D Door kit included, no rejection kit
R Not included, with rejection kit
N Not included, no rejection kit
Position 9 TOC Switches (Truck Operated Cell)
N Not included (default)
Position 10 Shutters
N Not included (default)
S Included
Position 11 Secondary Contact Terminals Installed
N None
B Defined by breaker
F Full complement
C Common options when cassette ships alone
Position 12 Future Use
N None
Position 13 Future Use
N None
Position 14 Cassette Shipping
C Cassette only
B Breaker shipped in cassette
Figure 2a. Series NRX Type RF - Frame Cassette Catalog Numbering System
Breaker Overview
Figures 3-6 highlight the main components that make up a Series
NRX breaker.
Drawout breaker and cassette
A drawout circuit breaker is used in combination with a drawout
cassette (Figures 3 and 4). Mounted on the drawout breaker are the
primary finger clusters and levering mechanism. These components
are located on the breaker to allow users easy access when
performing product inspection or maintenance. The cassette provides
all the necessary drawout circuit breaker interfaces, including primary
and secondary connections. Standard flat terminal pads on the rear of
the cassette provide for a variety of primary connection configurations.
Optional primary adapters are available for front and rear bus or cable
connections. For specific details and mounting instructions for primary
adapters, refer to IL01301053E.
Refer to Section 5 for mounting and installation dimensional
information. Electronic files of dimensional drawings for customer use
are available for download at www.eaton.com/seriesnrx.
Fixed circuit breaker
A fixed circuit breaker is rigidly mounted in its structure with no
drawout feature. The circuit breaker is available in front and rear-
connected configurations (Figure 5).
The breaker can be mounted on a suitable horizontal mounting surface
using left and right-side mounting feet. A standard fixed circuit breaker
is supplied with flat primary terminal pads on the rear of the breaker
that will accommodate a variety of primary connection configurations.
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Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
1. Arc Chute Cover
2. Front Cover
3. Drawout Wheels
4. Lifting Handle
5. Plug Connector for Secondary Contacts
6. Primary Finger Cluster
7. Phase Barriers (optional)
8. Levering Mechanism
9. On Board Lev-in Tool
1
4
3
2
1
5
4
3
6
7
8
9
8
Figure 3. Typical NRX Drawout Circuit Breaker
ote:N Refer to Figure 6 for more visual details of front cover.
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Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
1. Drawout Extension Rail
(shown in extended and locked position)
2. Secondary Connectors
3. Lifting Handle
4. Interlock Plate/Pins
5. Grounding (earthing) Bar
6. Gas Ventilation Opening
7. Stationary Primary Contacts
8. Safety Shutters (optional)
9. Primary Terminal Pad
10. Barrier (optional)
11. Secondary Wiring Point Identification
10
5
1
3
2
6
1
7
8
4
3
1
6
9
6
11
Figure 4. Typical NRX Drawout Cassette
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Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
1. Front Cover
2. Secondary Contacts
3. Arc Chute Cover
4. Lifting Handle
5. Primary Terminal Pad
6. Secondary Point Identification
7. Installation Mounting Feet
3
4
2
1
4
5
3
6
7
7
Figure 5. Typical NRX Fixed Circuit Breaker
ote:N Refer to Figure 6 for more visual details of front cover.
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Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
1. Nameplate
2. Charging Handle
3. Operations Counter (Optional)
4. Position Indicator (Drawout Only)
5. Levering Access Door Safety Padlock
(Drawout Only)
6.
Levering Access Door (Drawout Only)
7. Levering Key Lock (Optional,
Drawout Only)
8. Frame Rating Module
9. Rating Plug
10. Test Port
11. Trip Unit
12. Pop-out Trip Indicator (Optional)
13. Breaker Key Lock (Optional)
14. Contact Status
15. Ready-to-close Status Flag
16. Mechanism Spring Status
17. Manual OFF
18. Manual ON
19. Padlock Pushbutton Cover Mounting
Holes
2
9
7
11
17
8
10
6
12
4
1
3
13
14
15
16
18
5
19
Figure 6. Typical NRX Drawout Circuit Breaker Front Cover
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Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Section 2: Receiving, Unpacking, and Inspection
Suggested tools
•
Flat-blade/Phillips head screwdrivers
•
3/8-inch levering tool or extension/ratchet
•
5 mm Allen head screwdriver
•
1/2 inch socket and ratchet or 1/2 inch wrench
Circuit breaker unpacking and inspection
Inspect shipping containers for obvious signs of external damage.
Record any observed damage for reporting to the transportation carrier
and Eaton. All reports and claims should be as specific as possible and
include the order number and other applicable nameplate information.
ote:N The outside of the circuit breakers shipping container includes
a transport “Tip-N-Tell” indicator alerting the receiver as to whether
or not the shipping container was transported and handled in the
required manner. Refer to Table 1 for details about the indicator before
removing the circuit breaker from its container.
Table 1. Transport Indicator
Triangle at top of indicator is
partially full or totally full of blue
beads
• Transport was not in keeping
with instructions (breaker
container was tilted or
overturned)
• Check breaker closely for
damage
Triangle at top of indicator has no
blue beads in it.
• Breaker container was not tilted
or overturned during transport
Triangle
Blue Beads
When ready to inspect and/or install a Series NRX circuit breaker,
proceed with the following steps:
Step 1: Carefully open container and remove all packing/shipping
material and documentation.
Figure 7. Step 1
Note: Follow Step 1 also when handling a separately shipped drawout
cassette.
Step 2: Save all packing/shipping material and documentation for
future shipments or breaker storage purposes.
Step 3: Move the breaker to a convenient place for closer examination.
Drawout breakers are provided with a lifting handle on both sides to
assist lifting. Repeat for a drawout cassette. The cassette is provided
with a lifting indentation on each side.
Use an appropriate device to lift the breaker or cassette (Table 2).
If one is not available, it is recommended that a minimum of two
people be used to lift/move a breaker or cassette.
ote:N Refer to Table 2 for additional precautions and lifting procedures.
Figure 8. Step 3
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Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
Table 2. Suggested Lifting Procedures and Precautions
When using an appropriate overhead lifting device, attach the lifting
harness in the locations as shown below that best fits the circumstance
(Upright Cassette) (Breaker in Cassette)
(Cassette Front Up) (Breaker Only)
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Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Figure 9. Step 3
Carefully place a breaker or cassette on a solid work surface capable
of handling their weight for examination (Table 3). A drawout circuit
breaker can also be examined while withdrawn on the drawout
extension rails of an already installed cassette. Fixed circuit breakers
already installed in an assembly can be inspected in their installed
location.
CAUTION
DO NOT ATTEMPT TO LIFT A BREAKER OR CASSETTE WITH ORDINARY
CRANE HOOKS OR CHAINS. DAMAGE TO VITAL CIRCUIT BREAKER PARTS
COULD RESULT. USE TWO APPROPRIATE LIFTING STRAPS WHEN USING ANY
TYPE OF LIFTING DEVICE.
CAUTION
MAKE CERTAIN THAT THE CASSETTE IS PROPERLY MOUNTED OR SEATED
SECURELY ON A WORK TABLE BEFORE ATTEMPTING TO HAVE THE BREAKER
FULLY EXTENDED ON THE CASSETTE’S DRAWOUT RAILS. FAILURE TO
COMPLY COULD RESULT IN THE CASSETTE TIPPING FORWARD RESULTING IN
EQUIPMENT DAMAGE AND/OR BODILY INJURY.
Step 6: All circuit breakers, once removed from their shipping
containers, should be visually inspected for any obvious damage.
Check to make sure that the installed trip unit and nameplate
information match the equipment as ordered. All circuit breakers
should be operated as described in Section 3 prior to being put into
service.
Table 3. Approximate Weights
Item Lbs Kg
Drawout breaker, three-pole 152 69
Drawout breaker, four-pole 189 86
Fixed breaker, three-pole 100 45
Fixed breaker, four-pole 124 56
Drawout cassette, three-pole 63 29
Drawout cassette, four-pole 78 35
Storing circuit breaker
Store a circuit breaker in its original shipping container with contacts
open and springs discharged. Keep it in a clean dry place. Ensure there
is ample air circulation and heat, if necessary, to prevent condensation.
IMPORTANT
A CIRCUIT BREAKER STORED FOR ANY LENGTH OF TIME SHOULD BE
OPERATED A MINIMUM OF FIVE TIMES BEFORE IT IS PLACED IN SERVICE.
CAUTION
DO NOT STORE EQUIPMENT ON ITS BACK. THIS COULD RESULT IN
EQUIPMENT DAMAGE.
(Circuit Breaker)
(Breaker in Drawout
Cassette)
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Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
Section 3: Breaker General Operation
CAUTION
MAKE CERTAIN THAT THE CASSETTE IS PROPERLY MOUNTED OR SEATED
SECURELY ON A WORK TABLE BEFORE ATTEMPTING TO HAVE THE BREAKER
FULLY EXTENDED ON THE CASSETTE’S DRAWOUT RAILS. FAILURE TO
COMPLY COULD RESULT IN THE CASSETTE TIPPING FORWARD RESULTING IN
EQUIPMENT DAMAGE AND/OR BODILY INJURY.
Installing drawout circuit breaker into cassette
In a structure equipped for a drawout circuit breaker, a bolted-in
cassette with movable, captive extension rails supports the circuit
breaker.
CAUTION
IT IS IMPORTANT TO TAKE CARE WHEN PLACING A DRAWOUT CIRCUIT
BREAKER ON ITS EXTENSION RAILS. IF THE CIRCUIT BREAKER IS NOT
PROPERLY SEATED ON THE RAILS, THE BREAKER COULD FALL CAUSING
EQUIPMENT DAMAGE AND/OR BODILY INJURY.
To install the drawout circuit breaker, proceed first with the following
four steps:
Step 1: Press the extension rail spring away from the extension rail
until the retaining pin is fully released. Each drawout rail is provided
with a curved cutout to accommodate a gloved hand.
Extension
Rail Spring
Figure 10. Step 1
Step 2: Lower both rails down into their extended and locked position.
Figure 11. Step 2
Step 3: Carefully place the circuit breaker on the extended rails. Be
certain that the circuit breaker’s metallic support wheels (two on each
side of the circuit breaker) are properly seated on the extension rails.
With breaker properly seated on the extension rails slide the breaker
fully into the cassette and raise both rails up into the cassette so
that they engage the extension rail spring. The breaker is now in the
cassette in the DISCONNECT position.
Figure 12. Step 3
Step 4: To remove the breaker from the cassette lower both rails down
into their extended and locked position. Using the charging handle pull
the breaker out onto the extension rail.
17
Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Figure 13. Step 4
Rejection interlocks
Series NRX drawout circuit breakers come in a variety of continuous
current and interrupting ratings. To prevent the insertion of a drawout
circuit breaker into a cell with which it is incompatible, rejection
interlock key plates are provided for both the circuit breaker and the
cassette. One key plate is located on the bottom of the circuit breaker
and one is located on the floor of the cassette. Rejection pins must
be installed in both plates to complete the interlock scheme. The
switchboard builder is responsible for installing the rejection
pins in the appropriate pattern in the rejection plates on both the
circuit breaker and cassette. A rejection pin installation kit, including
the instruction leaflet IL01301006E, is supplied by the factory for this
purpose.
WARNING
NEVER ATTEMPT TO DISABLE ANY INTERLOCKS. DOING SO COULD RESULT
IN AN ELECTRICAL FAULT THAT COULD RESULT IN DEATH, BODILY INJURY,
AND/OR EQUIPMENT DAMAGE.
Drawout circuit breaker positioning
Series NRX drawout circuit breakers have four normal positions:
•
WITHDRAWN (Figure 14)
•
DISCONNECT (Figure 15)
•
TEST (Figure 16)
•
CONNECT (Figure 17)
The WITHDRAWN position is outside the compartment on the
cassette’s drawout rails. The DISCONNECT, TEST, and CONNECT
positions are reached by means of the levering mechanism and can be
achieved with the assembly door closed.
•
Breaker out of cassette
•
Primary connections not made
•
Secondary connections not made
Figure 14. WITHDRAWN Position
•
Breaker in cassette
•
Primary connections not made
•
Secondary connections not made
Figure 15. DISCONNECT Position
18
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
•
Breaker in cassette
•
Primary connections not made
•
Secondary connections made
Figure 16. TEST Position
•
Breaker in cassette
•
Primary connections made
•
Secondary connections made
Figure 17. CONNECT Position
With the circuit breaker sitting solidly on the extension rails in its
WITHDRAWN position, proceed with the following five steps to move
the circuit breaker through its other positions.
Step 1: Make sure the circuit breaker position indicator, located in
the right lower portion of the circuit breaker, indicates DISCONNECT
(Figure 15).
Step 2: If the indicator window indicates anything other than
DISCONNECT, use the breaker’s on board tool (racking tool) to
get the circuit breaker in the proper levering position. Insert the
levering tool into its compatible front accessible fitting, and rotate it
counterclockwise until DISCONNECT is indicated in the window. An
audible “click” may be heard. This is the levering-in’s detent system
engaging, which provides positive feedback when the device is in each
discrete position.
ote:N The Detent will engage at each discrete position (Disconnect,
Test, Connect) and requires the user to manually reset the system
before proceeding to the next position.
Figure 18. Step 2
“CLICK” SOUND
DETENT ENGAGED
Figure 18a. Step 2
Step 3: Carefully push the circuit breaker into its compartment until it
stops. The extension rails can now be folded up and latched.
19
Instructional Book MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Figure 19. Step 3
Step 4: The breaker is ready to be levered. With the circuit breaker
OPEN, reset the detent system by sliding the grey button to the right,
then release (Figure 18a). Rotate the levering tool clockwise to the
different available positions (DISCONNECT, TEST, CONNECT).
ote:N The position indicator on the lower right portion of the breaker
indicates the position as each position is reached.
When the breaker reaches the CONNECT position, a hard stop
is encountered. Discontinue levering to avoid damage due to
torquing beyond the maximum of 25 ft-lb (33.3 Nm).
ote:N Full CONNECT
= Hard Stop
Figure 20. Step 4
Step 5: To remove the circuit breaker from any position or from
the compartment completely, reverse the insertion procedure just
described in Steps 1 through 4 by rotating the levering tool in a
counterclockwise direction. When the DISCONNECT position is
reached, the circuit breaker will no longer move out of the cassette as
a result of rotating the levering tool. At this point, the circuit breaker
can be pulled out of the cassette onto its drawout rails.
IMPORTANT
THE CIRCUIT BREAKER MECHANISM IS INTERLOCKED SUCH THAT CHARGED
CLOSING SPRINGS ARE AUTOMATICALLY DISCHARGED IF THE CIRCUIT
BREAKER IS LEVERED INTO OR OUT OF THE CELL. DISCHARGE TAKES PLACE
BETWEEN THE DISCONNECT AND TEST POSITIONS.
Operating mechanism
The Series NRX operating mechanism is a two-stage stored energy
trip-free mechanism. Energy is stored for a closing operation with
sufficient energy remaining to open the circuit breaker after a closing
operation.
All circuit breakers should be operated manually and/or electrically
before they are put into service. This can be done during the installa-
tion process or some later date prior to startup. To perform this opera-
tional check, follow the procedures outlined in this section.
Manual operation
On manually operated circuit breakers, the closing spring can only be
charged manually. To manually charge the spring and operate the circuit
breaker, proceed with the following three steps:
Step 1: Insert one finger in the curved recess behind the charging
handle and pull out and down.
Figure 21. Step 1
Step 2: It takes approximately seven full downward strokes to
complete the charging process. It is possible to manually recharge the
spring immediately after closing the breaker, before it has been tripped
open. The status of the spring (charged or discharged) is indicated in
the mechanism spring status window just above the pushbuttons.
20
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
Figure 22. Step 2
Step 3: Standard manually operated circuit breakers are closed and
opened by hand using the Manual ON and Manual OFF buttons
located on the front of the circuit breaker. To perform either operation,
press and release the appropriate button. Pressing the close button
will not close the breaker unless the Ready-to-Close flag displays
ready. The Ready-to-Close flag is adjacent to the spring status flag. The
Ready-to-Close flag will display not-ready if the breaker is closed, not
fully charged, or held in the tripped state by an accessory or interlock.
The status of the contacts (open or close) is indicated in the Contact
Status Window just above the pushbuttons on the front of the breaker.
Figure 23. Step 3
Figure 24. Step 3
Optional electrically operated accessories are available to automatically
close/trip a manually operated breaker.
Electrical operation
The springs on an electrically operated circuit breaker are normally
charged automatically through the use of an electrical operator. The
springs can, however, be charged manually as just described in the
last section. Electrically operated circuit breakers can also be manually
closed and opened through the use of the front mounted ON and OFF
buttons.
An electrically operated circuit breaker can be equipped with an
optional spring release (closing coil) to close the circuit breaker
remotely. The breaker can also be equipped with a shunt trip (opening
coil) to open the breaker remotely.
IMPORTANT
DIFFERENT DEGREES OF ACCESS TO PUSHBUTTONS ON THE FRONT OF THE
CIRCUIT BREAKER CAN BE ACHIEVED THROUGH THE USE OF OPTIONAL
ACCESSORY DEVICES.
Anti-pump feature
Series NRX circuit breakers have both mechanical and electrical anti-
pump features. If the circuit breaker is closed on a fault condition and
trips open while the CLOSE signal is maintained (using either the
mechanical pushbutton or the electrical close coil), it will not make a
subsequent attempt to close until the close command is removed and
reapplied.
ote:N If the close signal is applied prematurely (before the breaker is
completely charged and latched), the close command will be ignored
until it is removed and reapplied.
For electrical closing, a Latch Check Switch (LCS) option is available
that will block the application of the electrical close command until the
breaker is ready.
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Eaton Series NRX low voltage power air circuit breakers User manual
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