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Instruction Manual MN013001EN
Series NRX with PXR – Type NF Low Voltage Power (Air) Circuit Breaker Instruction Manual
MN013001EN May 2015 www.eaton.com
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 .
WARNING
Series NRX circuit breakers are provided with safety fea-
tures . 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 inopera-
tive, as this may result in death, bodily injury, or prop-
erty damage .
WARNING
Series NRX circuit breakers should not under any cir-
cumstances be applied outside their nameplate ratings .
Operation outside of these ratings could result in death,
bodily injury, or property damage .
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 .
WARNING
Failure to inspect, clean, and maintain circuit breakers
can reduce equipment life or cause the equipment to
not operate properly under faulty conditions . This could
result in equipment damage, bodily injury, or even
death .
WARNING
Arc chutes and their cover plates must always be
secured properly in place before a breaker is installed in
its compartment . Failure to do so could result in equip-
ment damage, bodily injury, or even death .
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 for-
ward resulting in equipment damage and/or bodily injury .
CAUTION
Do not store equipment on its back . This could result in
equipment damage .
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 .
CAUTION
Inspection and maintenance procedures should be carried
out only by personnel familiar with the hazards associated
with working on power circuit breakers . Additionally, they
should become familiar with the specifics associated with
Series NRX circuit breakers as presented in this manual .
IMPORTANT
Please read and understand these instructions before
attempting to unpack, install, operate, or maintain this equip-
ment . Study the breaker and its mechanism carefully before
attempting to operate it on an energized circuit .
IMPORTANT
A circuit breaker stored for any length of time should be
operated a minimum of five times before it is placed in ser-
vice .
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 .
IMPORTANT
Different degrees of access to push-buttons on the front
of the circuit breaker can be achieved through the use of
optional accessory devices .
IMPORTANT
Before doing any work, make sure a drawout breaker is
levered out to the TEST, DISCONNECT, or WITHDRAWN
position . During the levering out and levering in of the cir-
cuit breaker, be aware of any signs that would indicate that
the levering process is not working properly . If working on
a fixed circuit breaker, bus systems should be de-energized
for convenience and safety . All circuit breakers should be
switched to the OFF position and the mechanism springs
discharged .
IMPORTANT
Fixed breakers have an arc hood positioned over the arc
chutes/arc chambers that must be removed first . Refer to
IL01301014E for installation and removal instructions . After
the inspection, reinstall the arc hood .
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