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Eaton Series NRX, MN01301001E: Series NRX, Series NRX low voltage power air circuit breakers User manual

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Instruction Manual MN01301001E Effective November 2016
Supersedes April 2016
Typical drawout circuit
breaker and cassette
Typical fixed circuit
breaker (rear connect)
Typical fixed circuit breaker
(front connect)
Instructions apply to:
1600 NRX SUB-TITLE IMAGE (12/15/2010)
Type NF Frame Series NRX
ANSI, UL 1066, UL 489/IEC IZMX16, IZM91
Series NRX low voltage power (air)
circuit breakers
2
Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
Contents
Description Page
Contents ..................................................................................................2
List of figures ..............................................................................................2
List of tables ...............................................................................................4
Section 1: Introduction .......................................................................................5
Section 2: Receiving, handling, and installation ...................................................................14
Section 3: Circuit breaker description and operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Section 4: Circuit breaker features and accessories ................................................................22
Section 5: Dimensional drawings for installation of drawout circuit breakers and cassettes ................................29
Section 6: Dimensional drawings for installation of fixed circuit breakers ...............................................42
Section 7: Inspection and maintenance .........................................................................61
Section 8: Troubleshooting ...................................................................................64
List of gures
Figure 1. Series NRX nameplate location .........................................................................6
Figure 2. Series NRX catalog number system breaker and cassette identification .......................................7–8
Figure 2a. Series NRX Type NF frame cassette catalog numbering system ...............................................9
Figure 3. Typical Series NRX drawout circuit breaker ...............................................................10
Figure 4. Typical Series NRX drawout cassette (front and rear views) ..................................................11
Figure 5. Typical Series NRX fixed circuit breaker (rear connected type) ................................................12
Figure 6. Typical Series NRX drawout circuit breaker front cover ......................................................13
Figure 7. Step 1 ............................................................................................14
Figure 8. Step 3 ............................................................................................14
Figure 9. Step 5 ............................................................................................16
Figure 10. .................................................................................................16
Figure 11. Step 1 ...........................................................................................17
Figure 12. Step 2 ...........................................................................................17
Figure 13. Step 3 ...........................................................................................17
Figure 14. WITHDRAWN position ..............................................................................18
Figure 15. DISCONNECT position ..............................................................................18
Figure 16. TEST position .....................................................................................18
Figure 17. CONNECT position .................................................................................19
Figure 18. Step 2 ...........................................................................................19
Figure 19. Step 3 ...........................................................................................19
Figure 20. Step 4 ...........................................................................................19
Figure 21. Typical mounting configurations .......................................................................20
Figure 22. Side-mounted mounting feet .........................................................................20
Figure 23. Step 1 ...........................................................................................21
Figure 24. Step 2 ...........................................................................................21
Figure 25. Step 3 ...........................................................................................22
Figure 26. Installed Digitrip 520 trip unit .........................................................................23
Figure 27. Secondary point identifications ........................................................................24
Figure 28. Secondary terminal blocks ...........................................................................25
Figure 29. Weidmuller plug and crimp contact ....................................................................26
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
List of gures (continued)
Description Page
Figure 30. Extraction tool in use ...............................................................................26
Figure 31. Left accessory tray .................................................................................26
Figure 32. Right accessory tray ................................................................................26
Figure 33. Three-pole drawout cassette—rear/top views in inches (mm) ................................................30
Figure 34. Three-pole drawout cassette—side views CONNECTED and TEST positions in inches (mm) .......................31
Figure 35. Three-pole drawout cassette—side views DISCONNECTED and WITHDRAWN positions in inches (mm) .............32
Figure 36. Three-pole drawout cassette—top/side views with horizontal universal bus adapters in inches (mm) .................33
Figure 37. Three-pole drawout cassette–top/side views with vertical universal bus adapters in inches (mm) ....................34
Figure 38 Three-pole drawout cassette—front view door cutout details in inches (mm) ....................................35
Figure 39. Four-pole drawout cassette—rear/top views in inches (mm) .................................................36
Figure 40. Four-pole drawout cassette—top/side views with horizontal universal bus adapters in inches (mm) ..................37
Figure 41. Four-pole drawout cassette—top/side views with vertical universal bus adapters in inches (mm) ....................38
Figure 42. Four-pole drawout cassette— side views CONNECTED and TEST positions in inches (mm) .......................39
Figure 43 Four-pole drawout cassette—side views DISCONNECTED and WITHDRAWN positions in inches (mm) ..............40
Figure 44. Four-pole drawout cassette—front view door cutout details in inches (mm) ....................................41
Figure 45. Surface mounted ..................................................................................42
Figure 46. Rear connected ...................................................................................42
Figure 47. Three-pole fixed breaker overall views and dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600 A) ............43
Figure 48. Three-pole fixed breaker overall views and dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600 A) ............44
Figure 49. Three-pole fixed breaker foot mount dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600 A) .................45
Figure 50. Three-pole fixed breaker surface mount, cable connect dimensions in inches (mm)
(UL 800–1200 A / IEC 630–1600 A, 800 kcmil, 750 kcmil, and 500 kcmil lugs) ...........................................46
Figure 51. three-pole fixed breaker parallel bus mounting dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600 A) .........47
Figure 52. Three-pole fixed breaker vertical universal bus adapters dimensions in inches (mm)
(UL 800–1200 A / IEC 630–1600 A) .............................................................................48
Figure 53. Three-pole fixed breaker horizontal universal bus adapter dimensions in inches (mm)
(UL 800–1200 A / IEC 630–1600 A) .............................................................................49
Figure 54. Three-pole fixed breaker accessory tray installation and removal clearance dimensions in inches (mm) ...............50
Figure 55. Three-pole fixed breaker—front view door cutout detail dimensions in inches (mm) ..............................51
Figure 56. Four-pole fixed breaker overall views and dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600 A) .............52
Figure 57. Four-pole fixed breaker overall views and dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600 A) .............53
Figure 58. Four-pole fixed breaker foot mount dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600A) ..................54
Figure 59. Four-pole fixed breaker surface mount, cable connect dimensions in inches (mm)
(UL 800–1200 A / IEC 630–1600 A, 800 kcmil, 750 kcmil, and 600 kcmil lugs) ...........................................55
Figure 60. Four-pole fixed breaker parallel bus mounting dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600 A) .........56
Figure 61. Four-pole fixed breaker universal bus adapters vertical dimensions in inches (mm) (UL 800–1200 A / IEC 630–1600 A ...57
Figure 62. Four-pole fixed breaker universal bus adapters horizontal dimensions in inches (mm)
(UL 800–1200 A / IEC 630–1600 A) .............................................................................58
Figure 63. Four-pole fixed breaker accessory tray installation and removal clearance dimensions in inches (mm) ................59
Figure 64. Four-pole fixed breaker—front view door cutout detail dimensions in inches (mm) ...............................60
Figure 65. Typical ANSI nameplate .............................................................................62
Figure 66. Typical IEC nameplate ...............................................................................62
Figure 67. Step 1 ...........................................................................................63
Figure 68. Step 2 ...........................................................................................63
Figure 69. Step 3 ...........................................................................................64
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
List of tables
Description Page
Table 1. Transport indicator ...................................................................................14
Table 2. Suggested lifting procedures and precautions .............................................................15
Table 3. Approximate weights ................................................................................16
Table 4. Series NRX ratings and configurations (three-pole and four-pole) ...............................................21
Table 5. Series NRX Digitrip trip units ...........................................................................23
Table 6. Series NRX wiring index (TD01301014E) ..................................................................24
Table 7. Customer wiring details ...............................................................................25
Table 8. Series NRX publications ............................................................................28–29
Table 9. Inspection frequency .................................................................................61
Table 10. Circuit breaker troubleshooting guide ...................................................................65
5
Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
Section 1: Introduction
Purpose
This instructional manual is intended to generally cover the
installation, operation, and maintenance of Series NRXTM 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. Accessory field installation instruction leaflets dedicated to
specific items.
3. 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 low voltage power (air) circuit breaker uses an
electronic tripping system. It is designed, manufactured, and
tested for use in both switchboard and metal-enclosed switchgear
assemblies in keeping with ULT 1066/ANSI C37.50, UL 489, and
IEC 60947-2 requirements. Series NRX circuit breakers are available
in a variety of different connection and mounting possibilities.
Continuous current ratings from 800–1600 A and interrupting
capacities to 85 kA are available depending on the applicable
standard. The circuit breaker nameplate provides complete
rating information and should always be inspected to ensure
the information shown is in keeping with the product ordered
(Figure 1). All Series NRX circuit breakers are 100 percent rated
and are suitable for reverse-feed applications. All are built and
tested in an ISOT 9002 certified facility.
A Series NRX non-automatic breaker is available in a fixed or drawout
configuration, and designed in keeping with IEC 60947-2 and UL
1066.
The fixed configuration NRX circuit breaker is designed for front/
rear bus or cable 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 Series NRX non-automatic 1000 Vdc IEC switch is available in a
fixed or drawout configuration, and designed to meet IEC 60947-3.
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON 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.
NSS6083W
Low Voltage AC Power
Circuit Breaker Frame
Series NRX
800 Ampere Frame
3 Pole
50/60 Hz
Made in U.S.A.
Enclosure Requirements:
XXXXXXX
Installation and Operating
Instructions:
XXXXXXX
Use Only Group A Rating Plug
P.O.#
XXXXXXXXXXXXXXXXXXXX
G.O.# XXXXXXXXXX
Item # XXX
Seq # XXX
Date Code YYMMDD-II
Interrupting Ratings
Max.
Volts
635
508
254
Inst.
Trip
kA
35
65
85
Short
Time
kA
42
42
42
Type NF
8ABAN2NNCX
Cat #
NSS6083W538ABAN2NNCX
NSS6083W53
Accessories
Motor Operator
Spring Release
Latch Check Switch
Shunt Trip #1
Shunt Trip #2
UVR
Auxiliary Switch
Bell Alarm Sw/OTS
110-125 Vac
110-127 Vac / Vdc
NONE
110-127 Vac / Vdc
NONE
NONE
2A/2B
NONE
Trip Unit Auxiliary Voltage = 24 Vdc
Figure 1. Series NRX nameplate location
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
The circuit breaker can be identified by a 20-digit catalog number
(Figure 2) located on the name plate. 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.
Position 1 Breaker Frame Size
N Type NF, 630–1600A, (70 mm pole spacing)
Position 2 Standard, Mechanism, Device
S UL 1066, stored energy, power breaker
X UL 489, stored energy, insulated case breaker
E IEC 60947-2, stored energy, air breaker
Positions 3 & 4 Fault Current Rating
S4 42 kA @ 480 Vac UL or 415 Vac IEC
S5 50 kA @ 480 Vac UL or 415 Vac IEC
S6 65 kA @ 480 Vac UL or 415 Vac IEC
Positions 5 & 6 Frame Rating (Amps)
07 630 (IEC only)
08 800
10 1000 (IEC only)
12 1200 (UL only)
13 1250 (IEC only)
16 1600 (on NF: IEC only)
Position 7 Poles, Phasing
3 3-pole, ABC
4 4-pole, NABC
Position 8 Mounting Configuration
W Drawout
B Fixed mount rear connect, mounting bracket, with secondary terminal
R Fixed mount rear connect, surface mount, with secondary
terminal row row
T Fixed mount front connect, surface mount, cable connect,
with secondary terminal row
F Fixed mount front connect, mounting bracket, bus connect,
with secondary terminal row
S Fixed mount front connect, surface mount, bus connect,
with secondary terminal row
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 N S S 6 0 8 3 W 5 2 8 A B A N 4 X N D X
Positions 9 & 10 Trip Unit
52 520 LSI, no ZSI
53 520 LSI, with ZSI
5G 520 LSIG, no ZSI
5H 520 LSIG, with ZSI
M2 520M LSI, no ZSI, 24 Vdc
M3 520M LSI, with ZSI, 24 Vdc
MA 520M LSIA, no ZSI, 24 Vdc
MB 520M LSIA, with ZSI, 24 Vdc
MG 520M LSIG, no ZSI, 24 Vdc
MH 520M LSIG, with ZSI, 24 Vdc
R2 520M LSI, no ZSI, 24 Vdc, with ARMS
R3 520M LSI, with ZSI, 24 Vdc, with ARMS
RA 520M LSIA, no ZSI, 24 Vdc, with ARMS
RB 520M LSIA, with ZSI, 24 Vdc, with ARMS
RG 520M LSIG, no ZSI, 24 Vdc, with ARMS
RH 520M LSIG, with ZSI, 24 Vdc, with ARMS
Position 11 Rating Plug (Amperes)
1 200
2 250
3 300
4 400
5 500
6 600
7 630
8 800
A 1000
B 1200
C 1250
D 1600
Position 12 Shunt Trip
N No shunt trip
A 110–127 Vac/dc
R 208–240 Vac/dc
Position 13 Motor Operator
M Manually operated
B 110–125 Vac
W 110–125 Vdc
T 208–250 Vac
P 220–250 Vdc
Position 14 Spring Release/Latch Check Switch (LCS)
N No spring release, no LCS
A 110–127 Vac/dc, no LCSR
R 208–240 Vac/dc, no LCS
Figure 2. Series NRX catalog numbering system (continued on next page)
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
Position 15 UVR, Second Shunt Trip
N None
A 110–125 Vac/dc UVR
R 220–250 Vac/dc UVR
1 110–127 Vac/dc second shunt trip
2 208–240 Vac/dc second shunt trip
Position 16 Aux. Switches/Label Language
E No aux. switches, no label (parent)
2 2 Form C, English
4 4 Form C, English
Position 17 Trip Indicator and Bell Alarm/OTS, Secondary Terminal Blocks
N No indicator, no OTS, secondary terminal blocks per breaker options
X Trip indicator provided, no OTS, secondary terminal blocks per breaker options
Z Trip indicator provided, 2 Form C OTS, Secondary terminal blocks per breaker options
M Interlocked trip indicator provided, no OTS, secondary terminal blocks per breaker options
Y Interlocked trip indicator provided, 2 Form C OTS, secondary terminal blocks per breaker options
1 No indicator, no OTS, full complement of secondary terminal blocks
2 Trip indicator provided, no OTS, full complement of secondary terminal blocks
3 Trip indicator provided, 2 Form C OTS, full complement of secondary terminal blocks
4 Interlocked trip indicator provided, no OTS, full complement of secondary terminal blocks
5 Interlocked trip indicator provided, 2 Form C OTS, full complement of secondary terminal blocks
Position 18 Padlock Provisions, Keylock Provisions, Operations Counter
N No PB covers, none, no counter
A Counter, no padlock, no keylocks
Position 19 Drawout Breaker Shipping, Fixed Breaker Terminals, Door Frame Kit
D Drawout (or parent) breaker shipping alone, without door frame kit, without terminals
C Drawout breaker in cassette, no shutters, no terminals, with door frame kit
K Fixed breaker rear connect, no terminals, with mounting foot, with door frame kit
A Fixed breaker rear connect, short vertical/horizontal terminals, no mounting foot, with door frame kit
B Fixed breaker rear connect, no terminals, no mounting foot, with door frame kit
E Fixed breaker rear connect, long vertical/horizontal terminals, no mounting foot, with door frame kit
F Fixed breaker rear connect, with short vertical/horizontal terminals, with mounting foot, with door frame kit
H Fixed breaker rear connect, with long vertical/horizontal terminals, with mounting foot, with door frame kit
1 Drawout breaker in cassette, no shutters, short vertical/horizontal terminals, with door frame kit
2 Drawout breaker in cassette, no shutters, long vertical/horizontal terminals, with door frame kit
4 Drawout breaker in cassette, shutters, short vertical/horizontal terminals, with door frame kit
5 Drawout breaker in cassette, shutters, long vertical/horizontal terminals, with door frame kit
9 Drawout breaker in cassette, shutters, no terminals, with door frame kit
Position 20 Future Use
X All product
Series NRX Breaker Catalog Numbering System
Figure 2. Series NRX catalog number system (continued from previous page)
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
Positions
NF Cassette Catalog Numbering System
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Positions 1 & 2 Cassette Family and Breaker Frame
NS UL 1066 N-Frame
NX UL 489 N-Frame
NE IEC N-Frame
Positions 3 & 4 Continuous Ampere Range
08 800A (UL 1066)
12 800–1200A (UL 489)
16 630–1600A (IEC)
Position 5 Poles, Phasing (Facing Front of Breaker)
3 3-pole, ABC
4 4-pole, NABC
Position 6 Load Terminal Connections
F With flat tapped pads only
G With vert./horz. bus adapt. kit (short style)
H With Front connected kit
N No flat-tapped pads or cassette stabs (interunit only)
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
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
F Full complement
B Defined by breaker
C Common options
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 NF frame cassette catalog numbering system
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
1. Arc chute cover
2. Primary shroud
3. Lifting handle
4. Front cover
5. Drawout wheels
6. Primary finger cluster
7. Secondary contacts
1
1
7
3
4
5
2
3
4
5
2
6
Figure 3.
Typical Series NRX drawout circuit breaker
ote:N Refer to Figure 6 for more visual details.
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
1. Drawout extension rail
2. Stationary primary contacts
3. Interlock plate/pins
4. Grounding (earthing) bar
5. Safety shutters (open)
6. Hand lifting indentation
7. Gas ventilation opening
8. Secondary connectors
9. Secondary wiring contact points
10. Primary terminal pad
11. One typical rear bus adapter
7
6
5
43
8
2
1
7
6
11
10
9
9
Figure 4. Typical Series NRX drawout cassette (front and rear views)
ote:N Refer to Figure 6 for more visual details.
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
1. Arc hood baffle
2. Arc hood
3. Secondary contacts
4. Front cover
5. Laser-etched secondary points location
6.
Typical rear bus adapter (horizontally mounted to primary terminal pad)
7.
Typical rear bus adapter (vertically mounted to primary terminal pad)
1
2
6
7
1
2
3
4
5
Figure 5. Typical Series NRX fixed circuit breaker (rear connected type)
ote:N Refer to Figure 6 for more visual details.
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
1. Contact status 2. Spring status 3. Charging handle
4. Nameplate 5. Manual ON 6. Operations counter
7. Position indicator 8. Levering access door 9. Frame rating module
10. Manual OFF 11. Rating plug 12. Test port
13. Pop-out trip flag 14. Trip unit 15. Off key lock
15
14
13
12
11
10
98
1
7
6
5
4
3
2
Figure 6. Typical Series NRX drawout circuit breaker front cover
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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
Section 2: Receiving, handling, and installation
Suggested tools
• Flat-blade/Phillips head screwdrivers
• 3/8-inch levering tool or extension/ratchet
• 3 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
Blue beads
Triangle at top of indicator
is partially full or totally full
of blue beads
Triangle at top of indicator
has no blue beads in it.
• Transport was not in
keeping with instructions
(breaker container was
tilted or overturned)
• Check breaker closely
for damage
• Breaker container was
not tilted or overturned
during transport
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.
ote:N Follow Step 1 also when handling a separately shipped drawout
cassette.
Figure 7. Step 1
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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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
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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Instruction Manual MN01301001E
Effective November 2016
Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
Step 5: Repeat Step 4 for a drawout cassette. The cassette is
provided with a lifting indentation on each side.
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.
Figure 9. Step 5
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.
Table 3. Approximate weights
Item Lb 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)
Figure 10.
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EATON www.eaton.com
Circuit breaker inspection
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 later in this section under the heading entitled “Circuit
breaker operation” prior to being put into service.
Installing drawout circuit breaker
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
three steps:
Step 1: Lift the drawout rails located on each side of the drawout
cassette all the way up until released. Each drawout rail is provided
with a curved cutout to accommodate a gloved hand.
Figure 11. Step 1
Step 2: Lower both rails down into their extended and locked position.
Figure 12. 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.
Figure 13. Step 3
Keep in mind that all drawout circuit breakers are provided
with safety interlocks to prevent inserting circuit breakers into
incompatible drawout cassettes.
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.
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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.
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
• Breaker in cassette
• Primary connections not made
• Secondary connections made
Figure 16. TEST position
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Instruction Manual MN01301001E
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EATON www.eaton.com
• 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 3/8-inch levering tool or 3/8-inch
drive extension and ratchet 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.
Figure 18. 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.
Figure 19. Step 3
Step 4: The breaker is ready to be levered. With the circuit breaker
OPEN, rotate the levering tool clockwise to and through 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
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Instruction Manual MN01301001E
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Series NRX low voltage power (air)
circuit breakers
EATON www.eaton.com
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.
Installing fixed circuit breaker
A fixed circuit breaker is solidly mounted in its structure with no
drawout feature. The circuit breaker is available in both surface-
mounted and rear-connected configurations (Figure 21). A surface-
mounted fixed circuit breaker is front connected and mounted
on a suitable vertical mounting surface using the appropriate
mounting hardware. Refer to specific hardware and mounting
instruction details provided in IL01301036E. Rear-connected fixed
circuit breakers can be mounted on a suitable horizontal or vertical
mounting surface using optional left- and right- side mounting feet.
In addition, front- connected fixed circuit breakers can also use
the mounting feet for mounting a breaker on a suitable vertical
surface. Refer to specific instruction details provided in IL01301030E
(Figure 22). Refer to Section 5 for breaker and primary bus stab
details and requirements.
Surface mounted
Rear connected
Figure 21. Typical mounting configurations
Right-side
mounting
foot
Figure 22. Side-mounted mounting feet
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
installation process or some later date prior to startup. To perform
this operational check, follow the procedures outlined in the next
section entitled “Circuit breaker description and operation.”
Section 3: Circuit breaker description
and operation
Introduction
Series NRX low voltage circuit breakers are available in both drawout
and fixed mounting configurations (Figure 3 and Figure 4). All circuit
breakers are available as three-pole or four-pole breakers with the
available connection configurations and specific ratings dictated by
the applicable standards (Table 4).
All features and accessories common to both the drawout and fixed
configurations are covered briefly in this section. Unique features
to either configuration are covered individually in Sections 4 and 5.
Controls and indicators are functionally grouped on the front of the
circuit breaker (Figure 6).
/