Eaton MN01301003E: Series NRX User manual

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 WITHDRAWN Position 17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Figure 34. 3-Pole Drawout Cassette – DISCONNECT/WITHDRAWN 30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

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

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

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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

•

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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