Eaton Series NRX User manual

Instruction Leaet IL01301008E Effective June 2015
Supersedes January 2013 Series NRX
Installation and removal instructions for Series NRX
undervoltage release, shunt trip, and overcurrent
trip switch in left accessory tray
Instructions apply to:
Series NRX, Type NF frame
ANSI, ULT1066, UL 489 / IEC,
IZMX16, IZM91
Series NRX, Type RF frame
IEC, IZMX40
mWARNING
(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.
mWARNING
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.

2
Instruction Leaet IL01301008E
Effective June 2015
Installation and removal instructions for Series NRX
undervoltage release, shunt trip, and overcurrent
trip switch in left accessory tray
EATON www.eaton.com
Section 1: General information
The left accessory tray will accommodate a maximum of four
accessory devices as follows (Figure 1):
• Zero or two (OTS)
• Zero or one (UVR)
• Zero, one, or two (ST)
• Combination (one ST and one UVR)
Shunt trip (ST)
The shunt trip opens the circuit breaker when its coil is energized
by a voltage input (Table 1). It is supplied with yellow and white
secondary leads connected to a secondary connector plug
(Figure 2). Shunt trips can be installed in left or right side of tray.
Undervoltage release (UVR)
The undervoltage release opens the circuit breaker when its supply
voltage falls to between 35% and 60% of rated voltage. If the
release is not energized to 85% of its supply voltage, the circuit
breaker cannot be closed electrically or manually (Table 2). It is
supplied with orange and brown secondary leads connected to a
secondary connector plug (Figure 3). UVR should only be installed
in right side of tray.
Overcurrent trip switch (OTS)
An overcurrent trip switch (bell alarm) provides an electrical
indication when a circuit breaker trips as a result of the trip unit
reacting to an overcurrent condition. An electrical indication will not
occur unless a standard or interlocking Trip Indicator is installed.
Refer to IL01301058E. Opening as a result of a circuit breaker’s
manual open button, shunt trip, or undervoltage release does not
cause the overcurrent trip switch to operate (Table 3). Overcurrent
trip switches are always supplied as a two-switch combination. The
combination is supplied with red, blue, and black secondary leads
connected to three secondary connector plugs (Figure 3).
ote:N A number of graphics in this instruction leaflet use the NF frame
breaker only as typical examples. The RF frame is similar in those situations.
OTS mounting location
Undervoltage release
mounting location or
second shunt trip
Shunt trip
mounting
location
Figure 1. Unpopulated left accessory tray (NF frame shown)
ST mounting
location
OTS
mounting
location
Front side Back side
UVR or second shunt trip
mounting location
Figure 2. Unpopulated left accessory tray (RF frame shown)
Shunt trip and undervoltage release
with secondary connector
Two OTS combination with
secondary connectors
Figure 3. Left tray accessories
mCAUTION
ANY SPECIFIC ACCESSORY LEAD ROUTING INSTRUCTIONS PRESENTED
IN THIS DOCUMENT SHOULD BE CAREFULLY ADHERED TO AT ALL TIMES.
FAILURE TO DO SO COULD RESULT IN LEAD DAMAGE AND/OR NO/
INAPPROPRIATE TRIPPING.

3
Instruction Leaet IL01301008E
Effective June 2015
Installation and removal instructions for Series NRX
undervoltage release, shunt trip, and overcurrent
trip switch in left accessory tray
EATON www.eaton.com
Table 1. Shunt trip ratings
Control
voltage Frequency
Operational
voltage
(range 70–110%)
Inrush/
continuous
power
consumption (VA) Opening time (ms)
24 DC 17–26 400/2 25
48 DC 34–53 500/3 25
60 DC 42-66 500/4 25
110–127 50–60 Hz 77–140 800/8 25
110–125 DC 77–138 800/8 25
208–240 50–60 Hz 146–264 850/8 25
220–250 DC 154–275 850/8 25
Table 2. Undervoltage release ratings
Control
voltage
Frequency
Operational
voltage
(range
(85–110%)
Dropout
voltage
range
(35–60%)
Inrush/
continuous
power
consumption (VA)
Opening
time (ms)
24 DC 20–26 8–14 425/2 50
32 DC 27–35 11–19 N/A 50
48 DC 41–53 17–29 750/3 50
60 DC 51-66 21-36 825/4 50
110–127 50–60 Hz 94–140 44–66 1150/8 50
110–125 DC 94–138 44–66 1150/8 50
208–240 50–60 Hz 177–264 84–125 1200/8 50
220–250 DC 187–275 88–132 1200/8 50
380–415 AC 323–457 145–228 N/A 50
480 AC 408–528 168–288 N/A 50
600 AC 510–660 210–360 N/A 50
Table 3. Overcurrent trip switch ratings
Control
voltage Frequency Contact rating (amperes)
250 50–60 Hz 10
125 DC 0.5
250 DC 0.25
Section 2: Installation of undervoltage
release and/or shunt trip in left
accessory tray
Proceed with the following 13 steps.
Step 1: Remove the four screws holding the front cover in place
(two on each side of the cover).
Figure 4. Step 1 (NF frame shown)
Step 2: Remove the front cover. Pull down on the charging handle to
simplify removal.
Figure 5. Step 2 (NF frame shown)

4
Instruction Leaet IL01301008E
Effective June 2015
Installation and removal instructions for Series NRX
undervoltage release, shunt trip, and overcurrent
trip switch in left accessory tray
EATON www.eaton.com
Step 3: Locate the left accessory tray behind the trip unit. For the
NF frame, place a finger on each end of the tray, and slide the tray
to the left for removal. For the RF frame, press the thumb tab down
and slide the tray to the left for removal.
ote:N A minimum of 2.00 inches (50.8 mm) for NF frame and 3.00 inches
(76.2 mm) for RF frame of side clearance is required on an installed fixed
breaker for tray removal.
Figure 6. Step 3 (NF frame shown)
Thumb tab
Figure 7. Step 3 (RF frame shown)
ote:N The shunt trip (ST) is intended to be mounted on the left side of
the tray, and the undervoltage release (UVR) is intended to be mounted
on the right side.
Step 4: With the left accessory tray positioned as shown, tilt the
UVR or the ST back to properly position it in the tray.
ST
Figure 8. Step 4 (NF frame shown)
ST
Figure 9. Step 4 (RF frame shown)
Step 5: Carefully push the other end of the UVR or the ST down into
the tray until a snapping sound is heard. This sound indicates the
accessory is locked in position.
Accessory
locking tab
ST
Figure 10. Step 5 (NF frame shown)

5
Instruction Leaet IL01301008E
Effective June 2015
Installation and removal instructions for Series NRX
undervoltage release, shunt trip, and overcurrent
trip switch in left accessory tray
EATON www.eaton.com
Accessory
locking tab
ST
Figure 11. Step 5 (RF frame shown)
Step 6: Route the two secondary leads behind the first molded
tab, down under a second molded tab, and out the end of the
accessory tray.
Molded tab 1
Molded tab 2
ST
Figure 12. Step 6 (NF frame shown)
Molded tab 1
Molded tab 2
ST
Figure 13. Step 6 (RF frame shown)
Step 7: If there is another UVR or ST to install in the other available
space of the left accessory tray, install it by repeating Step 4 and
Step 5.
Step 8: Carefully route the secondary leads of the second installed
accessory by following the same routing path and using the same
molded tabs as the first installed accessory from Step 6.
UVR
ST
Figure 14. Step 8 (NF frame shown)
UVR
ST
Figure 15. Step 8 (RF frame shown)
Step 9: The left accessory tray should look as shown in Figure 15
with two accessories installed and secondary wires properly routed.
Step 10: Place the left accessory tray with the installed UVR and/
or ST accessories back in its original position. Be careful not to bind
secondary wires or connector plugs.
UVR
ST
Figure 16. Step 10 (NF frame shown)