2
Instruction Leaflet
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
).
otee:
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
m
CAUTION
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.
