Eaton NRX Series neutral current sensors provide precise residual ground fault sensing in electrical distribution systems. They are designed for use with NRX circuit breakers and feature an air core design compatible with all Type RF In ratings. The sensors enable accurate detection of ground fault currents and enhance the overall protection of electrical systems. Their compact size and easy installation make them a suitable solution for various applications, ensuring reliable performance and safety in electrical networks.
Eaton NRX Series neutral current sensors provide precise residual ground fault sensing in electrical distribution systems. They are designed for use with NRX circuit breakers and feature an air core design compatible with all Type RF In ratings. The sensors enable accurate detection of ground fault currents and enhance the overall protection of electrical systems. Their compact size and easy installation make them a suitable solution for various applications, ensuring reliable performance and safety in electrical networks.
Series NRX with PXR - Instructions for
Neutral Current Sensor – Type RF
WARNING
(1) ONLY QUALIFIED ELECTRICAL PERSONNEL SHOULD BE PERMITTED TO WORK
ON THE EQUIPMENT.
(2) ALWAYS DE-ENERGIZE PRIMARY AND SECONDARY CIRCUITS IF A CIRCUIT
BREAKER CANNOT BE REMOVED TO A SAFE WORK LOCATION.
(3) DRAWOUT CIRCUIT BREAKERS SHOULD BE LEVERED (RACKED) OUT TO THE
DISCONNECT POSITION.
(4) ALL CIRCUIT BREAKERS SHOULD BE SWITCHED TO THE OFF POSITION AND
MECHANISM SPRINGS DISCHARGED.
FAILURE TO FOLLOW THESE STEPS FOR ALL PROCEDURES DESCRIBED IN THIS
INSTRUCTION LEAFLET COULD RESULT IN DEATH, BODILY INJURY, OR PROPERTY
DAMAGE.
WARNING
THE INSTRUCTIONS CONTAINED IN THIS IL AND ON PRODUCT LABELS HAVE TO
BE FOLLOWED. OBSERVE THE FIVE SAFETY RULES:
– DISCONNECTING;
– ENSURE THAT DEVICES CANNOT BE ACCIDENTALLY RESTARTED;
– VERIFY ISOLATION FROM THE SUPPLY;
– EARTHING AND SHORT-CIRCUITING; AND
– COVERING OR PROVIDING BARRIERS TO ADJACENT LIVE PARTS.
DISCONNECT THE EQUIPMENT FROM THE SUPPLY. USE ONLY AUTHORIZED
SPARE PARTS IN THE REPAIR OF THE EQUIPMENT. THE SPECIFIED MAINTENANCE
INTERVALS AS WELL AS THE INSTRUCTIONS FOR REPAIR AND EXCHANGE MUST
BE STRICTLY ADHERED TO PREVENT INJURY TO PERSONNEL AND DAMAGE TO
THE SWITCHBOARD.
Instructions apply to:
Effective March 2017
Supersedes March 2016 Series NRXInstruction Leaet IL0131094EN
UL489 series NRX RF frame
IEC IZMX40
2
Series NRX with PXR - Instructions for Neutral
Current Sensor – Type RF
EATON www.eaton.com
Instruction Leaet IL0131094EN
Effective March 2017
Section 1: Neutral Current Sensor Installation
Ground Fault Trip Units detect ground fault currents through Residual
Sensing. A different, round, torroidal sensor is required for source
ground or zero sequence sensing. All further information is for residual
ground fault sensing method only. If the system neutral is grounded
and residual ground fault is desired, but no phase to neutral loads are
used, a neutral current sensor is not necessary. In that case, a jumper
wire is required between circuit breaker secondary contact positions
11 and 12 (factory installed).
If the system neutral is grounded and phase to neutral loads are
used, then the neutral current sensor (see Figure 3) must be used to
account for this load in the residual ground fault sensing. It has the
same turns ratio as the phase current sensors in the Series NRX circuit
breaker. The neutral sensor is an air core design and can be used with
all Type RF I
n
ratings (Figure 1). The factory installed jumper wire at
secondary contact positions 11 and 12 must be removed before
installing the neutral current sensor. See Figure 2 for installation
details.
IMPORTANT
THE POLARITY OF THE SENSOR CONNECTIONS IS CRITICAL. ALWAYS
OBSERVE THE POLARITY MARKINGS ON THE INSTALLATION DRAWINGS.
THE POLARITY MARKINGS ARE IDENTIFIED AS WHITE DOTS ON THE
TRANSFORMERS. TO INSURE CORRECT GROUND FAULT EQUIPMENT
PERFORMANCE, CONDUCT FIELD TESTS TO COMPLY WITH NATIONAL
ELECTRIC CODE REQUIREMENTS UNDER ARTICLE 230-95-C. SEE
PERFORMANCE TESTING INSTRUCTIONS ON FOLLOWING PAGES.
Figure 1.
.938
[23,83]
.144
[3,64]
.500
[12,7]
1.574
[39,98]
.530
[13,46]
1.060
[26,92]
⌀ 3.594
[91,29]
1.002
[25,44]
1.50
[38,1]
.49
[12,5]
⌀.250
“T”
(1.063)
[27]
(1.574
)
[39,98]
(2.637
)
[66,98]
(3.700
)
[93,98]
3X (.984)
[24,99]
(3.937)
[100]
8X (⌀.463 -.417)
(11.76-10.6)
All dimensions in inch (mm).
WHITE POLARITY
LEAD WIRE
Dimensions.
Section 2: Performance Testing For Ground
Fault Circuit Breakers
General Test Instructions
The interconnect system shall be evaluated in accordance with the
equipment assembler’s detailed instruction by qualified personnel.
The polarity of the neutral sensor connection (if used) must agree
with equipment assembler’s detailed instructions to avoid improper
operations following apparently correct simulated test operations.
Where a question exists, consult the specifying engineer and/or
equipment assembler.
The grounding points of the system shall be verified to determine
that ground paths do not exist that would bypass the sensors. High-
voltage testers and resistance bridges may be used.
70C1718G11 70C1718G12
“T” 0.787 0.750
[20] [19]
3
Instruction Leaet IL0131094EN
Effective March 2017
Series NRX with PXR - Instructions for Neutral
Current Sensor – Type RF
EATON www.eaton.com
breaker to trip in less than one second, and if an alarm indicator is
supplied, it should operate. Reset the breaker and the alarm indicator.
Repeat the test on the other two phases.
If the system is a 4-wire system with a neutral current sensor, apply
the same current as described above through one phase of the
breaker, returning through the neutral sensor, as displayed in Figure 5.
The breaker should not trip and the alarm indicator, if supplied, should
not operate. Repeat the test on the other two phases.
If the system is a 3-wire system with no neutral current sensor, apply
the same current as described above through any two phases of the
breaker with the connections as displayed in Figure 6. The breaker
should not trip and the alarm indicator, if supplied, should not operate.
Repeat the test using the other two combinations of breaker phases.
Record the test results on the test form provided with the equipment.
CAUTION
FIELD TESTING SHOULD BE USED FOR FUNCTIONAL TESTING, NOT FOR
FIELD CALIBRATION. IF TEMPORARY CONNECTIONS WERE MADE FOR
THE PURPOSE OF CONDUCTING TESTS, RESTORE TO PROPER OPERATING
CONDITIONS BEFORE RETURNING THE BREAKER TO SERVICE.
WARNING
ELECTRICAL SHOCK OR BURN INJURY CAN OCCUR WHEN WORKING
ON POWER SYSTEMS. ALWAYS TURN OFF POWER SUPPLYING CIRCUIT
BREAKER BEFORE CONDUCTING TESTS. TEST OUT OF THE CELL, IF
POSSIBLE.
Figure 2.
Bus Bars
3.594”
9,1 cm
5”
12,7 cm
Top of Bus Bar
5” or 4”
12,7 cm or
10,2 cm
4x ø 0.41”
1,04cm
0.25” at 5”/ 0,6 cm at 12,7 cm
0.375” at 4”/ 1,0 cm at 10,2 cm
Bus Bar
Details
Sensor Outline
Details
0.375”/ M10 Hardware as
Required for Installation in
the Field
0.5”/1,27cm
0.984”/2,5cm
0.984”/2,5cm
0.984”/2,5cm
0.5”/1,3 cm
1.227” at 5”/ 3,1 cm at 12,7 cm Bus Bar
0.227” at 4”/ 0,6 cm at 10,2 cm Bus Bar
Sensor Installation Information - Type RF.
Figure 3.
X
X
N
Source
L C R
Neutral Sensor
Load
11 12
Neutral Current Sensor Application (IEC).
ote:N Since the ground fault circuit breakers derive their operating power from
the phase current and not from the neutral current, passing current through the
neutral sensor only will not properly test the ground fault feature.
Using a low voltage (0 - 24 V) high current AC source, apply a test
current of 125% of the ground fault pick-up setting through one phase
of the circuit breaker as displayed in Figure 4. This should cause the
4
Series NRX with PXR - Instructions for Neutral
Current Sensor – Type RF
EATON www.eaton.com
Instruction Leaet IL0131094EN
Effective March 2017
Figure 4.
Low
Voltage
Source
Source
Current Limiting
Resistor (if required)
Load
Connections for Ground Fault
Trip Test.
Figure 5.
Low
Voltage
Source
Source
Current Limiting
Resistor (if required)
Load
Connections for Ground Fault
No-Trip Test with a 4-Wire System.
Figure 6.
Low
Voltage
Source
Source
Load
Current Limiting
Resistor (if required)
Connections for Ground Fault
No-Trip Test with a 3-Wire System.
5
Instruction Leaet IL0131094EN
Effective March 2017
Series NRX with PXR - Instructions for Neutral
Current Sensor – Type RF
EATON www.eaton.com
Notes:
6
Series NRX with PXR - Instructions for Neutral
Current Sensor – Type RF
EATON www.eaton.com
Instruction Leaet IL0131094EN
Effective March 2017
Eaton is a registered Trademark.
All other trademarks are property of their
respective owners.
Eaton
Electrical Sector
1000 Eaton Boulevard
Cleveland OH 44122
United States
877-ETN-CARE (877-386-2273)
Eaton.com
© 2017 Eaton
All Rights Reserved
Printed in USA
Publication No. IL0131094EN/TBG001203
Part Number: IL0131094ENH03
March 2017
Disclaimer of warranties and limitation of liability
The information, recommendations, descriptions, and safety
notations in this document are based on Eaton Corporation’s
(“Eaton”) experience and judgment, and may not cover all
contingencies. If further information is required, an Eaton sales
office should be consulted.
Sale of the product shown in this literature is subject to the terms
and conditions outlined in appropriate Eaton selling policies or other
contractual agreement between Eaton and the purchaser.
THERE ARE NO UNDERSTANDINGS, AGREEMENTS, WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF
FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY,
OTHER THAN THOSE SPECIFICALLY SET OUT IN ANY EXISTING
CONTRACT BETWEEN THE PARTIES. ANY SUCH CONTRACT
STATES THE ENTIRE OBLIGATION OF EATON. THE CONTENTS OF
THIS DOCUMENT SHALL NOT BECOME PART OF OR MODIFY
ANY CONTRACT BETWEEN THE PARTIES.
In no event will Eaton be responsible to the purchaser or user in
contract, in tort (including negligence), strict liability, or otherwise
for any special, indirect, incidental, or consequential damage or loss
whatsoever, including but not limited to damage or loss of use of
equipment, plant or power system, cost of capital, loss of power,
additional expenses in the use of existing power facilities, or claims
against the purchaser or user by its customers resulting from the use
of the information, recommendations, and descriptions contained
herein.
The information contained in this manual is subject to change
without notice.
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Eaton NRX Series neutral current sensors provide precise residual ground fault sensing in electrical distribution systems. They are designed for use with NRX circuit breakers and feature an air core design compatible with all Type RF In ratings. The sensors enable accurate detection of ground fault currents and enhance the overall protection of electrical systems. Their compact size and easy installation make them a suitable solution for various applications, ensuring reliable performance and safety in electrical networks.
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