Eaton Series NRX Manual

Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
• 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
– 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:
1600 NRX SUB-TITLE IMAGE (12/15/2010)
Series NRX, Type NF Frame
ANSI, UL1066, UL489 / IEC, IZMX16, IZM91
Series NRX, Type RF Frame
IEC, IZMX40
4000 NRX RF DRAWOUTSUBTITLE IMAGE (12/15/2010)
effective January 2013 Series NRXInstruction Leaet IL01301010E

2
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Instruction Leaet IL01301010E
effective January 2013
Section 1: General information
Spring release (SR)
A spring release is recommended for electrically operated circuit
breakers, although it is an optional device (Figure 1). It remotely
closes the circuit breaker when the coil is energized by a voltage input.
When a latch check switch is installed, the closing spring must be fully
charged and the trip latch reset (not held in the tripped position) for the
SR to operate. If these two conditions are not met, the close signal
will be ignored until it is removed and re-applied (Table 1).
Figure 1. Spring Release
Latch check switch (LCS)
A latch check switch indicates when the circuit breaker is “ready to
close” (Figure 2 and Table 2).Two versions of the LCS are available:
1. Internal—The LCS wired to the spring release will not permit
activation of the spring release until the circuit breaker is fully
charged and the trip latch is reset. The LCS is supplied with two
leads and a small 2-pin connector.
2. External—The LCS used for remote indication consists of one
Form C contact wired to the circuit breaker secondary contacts for
integration into external control schemes.
Note: Wiring the LCS for remote indication directly in series with the SR
accessory is not recommended as this will override the “anti-pump” feature. The
LCS is supplied with three leads and two secondary connectors.
Figure 2.
External LCS
Internal LCS
Latch Check Switches
Table 1. Latch Check Ratings
Control Voltage Frequency Contact Rating (Amperes)
250 50–60 Hz 10
125 DC 0.5
250 DC 0.25
Note: Many illustrations use the NF Frame 1600A circuit breaker for illustrative
purposes only. The RF Frame 4000A circuit breaker is handled in a similar
fashion.
Table 2. Spring Release Ratings
Control Voltage Frequency
Operational Voltage (Range
85–110%)
Inrush Power Consumption
(VA) Closing Time (ms)
24 DC 20–26 400 25
48 DC 41–53 500 25
60 DC 51-66 500 25
110–127 50–60 Hz 94–140 750 25
110–125 DC 94–138 750 25
208–240 50–60 Hz 177–264 800 25
220–250 DC 187–275 800 25

3
Instruction Leaet IL01301010E
effective January 2013
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Section 2: Installation of spring release
Proceed with the following eight steps:
Step 1: Remove the four screws holding the front cover in place (two
on each side of the cover).
Figure 3. Step 1
Step 2: Remove the front cover. Pull down on the charging handle to
simplify removal.
Figure 4. Step 2
Step 3: To gain access to the mounting location, pull the charging
handle down as shown in Figure 5.
Figure 5.
SR Mounting Location
Step 3
Step 4: Position the spring release as shown to begin the installation
process (Figure 6).
Note: The spring release is secured in its mounted position with one captive
retaining screw.
Figure 6.
Captive Mounting Screw
Step 4

4
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Instruction Leaet IL01301010E
effective January 2013
Step 5: While pulling back on the manual charging handle, tilt the
spring release backward so it fits into and under the slot feature on the
breaker sideplate as shown.
Figure 7. Step 5
Step 6: Complete the mounting process by pushing the spring release
forward and securing it in place with its captive retaining screw. Use a
screwdriver to hand tighten the retaining screw.
Step 7: Make the appropriate secondary connections as outlined
in Section 9. If necessary, bundle secondary wires using industry-
accepted wire tie practices.
Step 8: Replace the front cover and secure it in place with the four
mounting screws previously removed in Step 1.
Section 3: Removal of spring release
Proceed with the following four steps:
Step 1: Remove the front cover from the breaker by first performing
Steps 1 and 2 of Section 2.
Step 2: Locate the spring release and disconnect the appropriate
secondary connection as described in Section 9.
Figure 8.
Spring Release
Step 2
Step 3: Unscrew the captive retaining screw from the spring release
and remove the spring release. Pulling forward on the manual charging
handle simplifies removal.
Step 4: If another spring release is to be installed, perform Steps
3 through 8 of Section 2. If not, complete the removal operation by
performing Step 8 of Section 2.
Section 4: Installation of latch check
switch in spring release
Proceed with the following five steps:
Step 1: Remove the spring release from the breaker prior to installing
a latch check switch by performing Steps 1 through 3 of Section 3.
Step 2: Position the spring release as shown. Tilt the latch check switch
back to properly position it for final installation. The LCS is shown
without leads soldered to appropriate terminals for clarity purposes
(Figure 9).
Figure 9. Step 2
Step 3: Carefully press the latch check switch down as shown until a
snapping sound is heard. This sound indicates the switch is properly
seated (Figure 10).
Figure 10. Step 3

5
Instruction Leaet IL01301010E
effective January 2013
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Step 4: If the latch check switch being installed is for use internally
in conjunction with the spring release, plug the small 2-pin connector
of the latch check switch into the 2-pin plug in the spring release. The
2-pin connector only fits one way and will latch into place. If the latch
check switch being installed is for use externally, skip this step and
proceed to Step 5. Keep in mind that separate secondary connections
with an externally mounted LCS will have to be made as part of Step
5.
Figure 11.
2-Pin Plug for Internal
LCS Connection
Step 4
Step 5: With the latch check switch now installed in the spring release,
repeat Steps 3 through 8 of Section 2.
Section 5: Removal of latch check switch
from spring release
Proceed with the following five steps:
Step 1: Remove the spring release from the breaker prior to removing
a latch check switch by performing Steps 1 through 3 of Section 3.
Step 2: If the latch check switch is internally connected to the spring
release, unplug its connector from the 2-pin plug in the spring release.
Figure 12.
2-Pin Plug for LCS Connection
Step 2
Step 3: With the spring release positioned as shown, pull back on the
locking tab to unlock the latch check switch from the spring release.
Figure 13. Step 3
Step 4: Tilt the latch check switch back and lift to release and remove
it from the spring release.
Figure 14. Step 4
Step 5: If another latch check switch is to be installed in the spring
release, perform Steps 2 through 5 of Section 4. If not, just reinstall
the spring release by performing Steps 3 through 8 of Section 2.

6
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Instruction Leaet IL01301010E
effective January 2013
Section 6: Motor operator general infor-
mation
A motor operator is an electric motor assembly internally mounted in
the right-hand side of the circuit breaker (Figure 15). It charges the
closing springs electrically for remote or local operation. The motor
operator can be factory or field installed (Table 3 NF and Table 4 RF).
If a motor operator is being installed in the field, an optional spring
release device can also be installed. Instructions for the installation of
a spring release are provided in Section 2 of this document.
Figure 15.
Motor
Operator
Motor Operator Location
Section 7: Installation of motor operator
Proceed with the following 11 steps:
Step 1: Remove the four screws holding the front cover in place (two
on each side of the cover).
Figure 16. Step 1
Step 2: Remove the front cover. Pull down on the charging handle to
simplify removal.
Table 3. Motor Operator Ratings - NF
Control Voltage Frequency
Operational Voltage
(Range 85–110%)
Run Current
(Amperes) Typ. Inrush Current
Power Consumed
(VA) Max. Charge Time (sec)
24 DC 20–26 6 325% 160 4
48 DC 41–53 3 500% 150 3
60 DC 51-66 2 350% 150 4
110–127 50–60 Hz 94–140 2 300% 280 3
110–125 DC 94–138 1 500% 150 3
208–240 50–60 Hz 177–264 1 1000% 280 4
220–250 DC 187–275 1 1000% 280 4
Table 4. Motor Operator Ratings - RF
Control Voltage Frequency
Operational Voltage
(Range 85–110%)
Run Current
(Amperes) Typ. Inrush Current
Power Consumed
(VA) Max. Charge Time (sec)
24 DC 20–26 7 350% 200 6
48 DC 41–53 3 450% 175 6
60 DC 51-66 3 450% 225 6
110–127 50–60 Hz 94–140 3 300% 425 6
110–125 DC 94–138 2 375% 275 6
208–240 50–60 Hz 177–264 1.5 300% 400 6
220–250 DC 187–275 1 400% 250 6

7
Instruction Leaet IL01301010E
effective January 2013
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Figure 17. Step 2
Step 3: If an existing motor operator is already installed, remove it first
by following the instructions outlined in Section 8. If not, proceed with
Step 4.
Step 4: To simplify installation, examine the motor operator to verify
that the hub key on the motor operator is in the proper position. It is
properly positioned if the arrowhead on the hub key lines up with the
hole in the hub housing as shown. If they are aligned, proceed to Step
6.
Figure 18.
Hub Key Arrowhead
Hole
Step 4
Step 5: If the arrowhead and hole are not aligned, rotate the hub key
clockwise using any appropriate tool to achieve alignment.
Figure 19. Step 5
Step 6: With the arrowhead and hole aligned, push on the two captive
mounting screws until they are nearly flush with their mounting collars.
This will simplify the Step 7 mounting process.
Figure 20.
Mounting Screw
Mounting Screw
Step 6
Step 7: For the NF Frame, align the hub key on the motor operator
with the key on the cam shaft and push the motor operator into its
mounted position. For the RF Frame, align the hub key on the motor
operator with the key in the cam shaft and position the motor operator
so the black actuator lever rests on the pin and is settled in the
mounted position.
•IMPORTANT
IT IS IMPORTANT THAT THE TWO KEYS ARE PROPERLY ALIGNED AND MATE
EASILY BEFORE TIGHTENING THE MOUNTING SCREWS IN STEP 8.

8
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Instruction Leaet IL01301010E
effective January 2013
Figure 21.
Cam Shaft
Key
Hub
Key
Step 7. NF Frame
Figure 21a. Step 7. RF Frame
Step 8: Use an Allen wrench to screw the captive mounting screws
(2 screws for NF and 3 screws for RF) of the motor operator into
the already tapped mounting holes in the circuit breaker. Firmly hand
tighten the two mounting screws.
Figure 22. Step 8
Step 9: The installed motor operator should look as shown with
secondary leads extending up and ready to be made.
Figure 23. Step 9
Step 10: Make the appropriate secondary connections as outlined
in Section 9. If necessary, bundle secondary wires using industry-
accepted wire tie practices.
ote:N If an externally wired latch check switch and a motor operator are installed
together, a simple secondary wiring change must be made. Remove the latch
check switch’s secondary connector plug as described in Section 9. Once
removed, disconnect the latch check switch’s secondary lead (#40-NF, #54-RF)
from the connector plug by inserting the terminal extraction tool (included in
the externally wired latch check switch kit) into the end of the connector plug
as shown. The tool releases the lead so it can be removed from the other end.
The connector plug can be discarded. The latch check switch’s disconnected
lead (#40-NF, #54-RF) is now reconnected into the open secondary location
in the motor operator’s connector plug. No tool is required to make this
connection. It is, however cautioned that the connector plug must be oriented
as shown in Figure 26 before making the connection. Gently push the lead into
the connector’s open spot, and it will easily connect and lock into place.
Rotate motor
operator to rest
black actuator
on pin
Motor operator
Pin
Black actuator
lever

9
Instruction Leaet IL01301010E
effective January 2013
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Figure 24.
#40-NF
#54-RF
Open
Secondary #39-NF
#53-RF
Step 10
Figure 25. Step 10
Secondary
Lead
Connector
Plug
Terminal
Extraction
Tool
Figure 26. Step 10
Step 11: Replace the front cover, and secure it in place with the four
mounting screws previously removed in Step 1.
Section 8: Removal of motor operator
Proceed with the following five steps:
Step 1: If necessary, remove the front cover from the breaker by
performing Steps 1 and 2 of Section 2.
Step 2: Locate the motor operator and disconnect the appropriate
secondary connections as described in Section 9.
Figure 27. Step 2
Step 3: Remove the motor operator from the circuit breaker by using
an Allen wrench to unscrew the captive motor operator mounting
screws (2 screws for NF and 3 screws for RF).
Figure 28. Step 3
Step 4: Complete removal of the motor operator by pulling it out
(Figure 29).

10
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Instruction Leaet IL01301010E
effective January 2013
Figure 29. Step 4
Step 5: Repeat Steps 4 through 11 of Section 7 if another motor
operator is to be installed. If not, just complete Step 11 of Section 7.
Section 9: Accessory secondary
connections
General information
1. Electrical accessory leads are tagged with numbers associated
with the applicable connection diagram located in instruction book
MN01301001E (NF) and MN01301003E (RF). Leads are also supplied
with keyed secondary connector plugs to ensure proper connections
(Figure 30).
2. Secondary connections are made by plugging the connector plugs
into the appropriate location. A connector plug already connected
can be removed by squeezing two release tabs together with small
needle nose pliers and pulling out (Figure 31).
Figure 30.
Tagged
Leads
Keyed
Connector
1
1
2
2
Leads and Connectors
Figure 31.
2
Release
Tabs
Connector Plug Removal
Fixed breaker connections
Proceed with the following five steps:
Step 1: Become familiar with the fixed terminal block DIN rail type
mounting plate where secondary connections are made.
ote:N Secondary connection points have numerical and descriptive laser-etched
identifications.
Figure 32.
4
357911 13 15 17 19
21 23 25 27
OT1M
OT2B
OT2M
ALM1
ALM2
ALMC
OT2C
OT1B
OT1C
N2
G2 G1
N1
SGF1
AGND
CMM2 CMM1
+24V
SGF2
CMM4 CMM3
ZOOM ZOUT
UV2 UV1
68 10 12 14 16 18
20
22
24
26
28
30
32
34
911 13 15 17 19
21 23 25 27
OT2B
OT2M
ALM1
ALM2
ALMC
OT2C
OT1B
N2
G2 G1
N1
SGF1
AGND
CMM2 CMM1
+24V
SGF2
CMM3
8 10 12 14 16 18
20
22
Step 1
Step 2: Plug the accessory connector plug into the fixed secondary
terminal block.