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Section 1: Introduction
Series NRX with PXR – Type NF Low Voltage Power (Air) Circuit Breaker Instruction Manual
MN013001EN May 2015 www.eaton.com
Section 1: Introduction
Purpose
This instructional manual is intended to generally cover the
installation, operation, and maintenance of Series NRX
TM
low voltage power (air) circuit breakers and drawout cas-
settes . Basic dimensional information is provided for the
installation of both the circuit breaker and cassette .
Refer to other documentation for more specific details .
1 . IL0131098EN – Operating Manual for Series NRX PXR
20/25 Trip Unit
2 . AD013001EN – PXR 20/25 Time Current Curves
3 . TD013001EN – Wiring Diagrams for PXR 20/25
4 . Accessory field installation instruction leaflets (IL) dedi-
cated to specific items are available for download at
www .eaton .com/seriesnrx .
5 . Visit www .eaton .com/seriesnrx for additional support
documentation .
Safety
All safety codes, safety standards, and/or regulations must
be strictly observed in the installation, operation, and main-
tenance of this equipment .
WARNING
The warnings and cautions included as part of the pro-
cedural steps in this manual are for personnel safety
and protection of equipment from damage . This exam-
ple of a typical warning is intended to familiarize per-
sonnel with the style of presentation .
IMPORTANT
Please read and understand these instructions before
attempting to unpack, install, operate, or maintain this
equipment . Study the breaker and its mechanism carefully
before attempting to operate it on an energized circuit .
All possible contingencies that may arise during installation,
operation, or maintenance, and all details and variations
of this equipment do not purport to be covered by these
instructions . If further information is desired by purchaser
regarding a particular installation, operation, or maintenance
of particular equipment, contact the local Eaton representa-
tive .
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 .
Safe Practices
To protect personnel associated with the installation, opera-
tion, and maintenance of this equipment, the following prac-
tices must be followed .
1 . Only qualified electrical personnel familiar with the
equipment, its operation, and the associated hazards
should be permitted to work on, install, or operate the
equipment .
2 . Always be certain that the primary and secondary cir-
cuits are de-energized or the circuit breaker is open and
removed to a safe work location before attempting any
maintenance .
3 . For maximum safety, only insert an open, completely
assembled breaker into an energized cell .
4 . Always ensure that drawout circuit breakers are in one
of their designed cell positions, such as CONNECT,
TEST, DISCONNECT, or WITHDRAWN . A circuit breaker
permitted to remain in an intermediate position could
result in control circuits being improperly connected,
resulting in electrical failures .
Qualified Personnel
For the purpose of operating and maintaining power circuit
breakers, a person should not be considered qualified if
the individual is not thoroughly trained in the operation of
the circuit breaker and how it interfaces with the assembly
in which it is used . In addition, the individual should have
knowledge of the connected loads .
For the purpose of installing and inspecting circuit breakers
and their associated assembly, a qualified person should
also be trained with respect to the hazards inherent to
working with electricity and the proper way to perform such
work . The individual should be able to de-energize, clear,
and tag circuits in accordance with established safety prac-
tices .
General Information
The Series NRX low voltage power (air) circuit breaker uses
an electronic tripping system . It is designed, manufactured,
and tested for use in both switchboard and metal-enclosed
switchgear assemblies in keeping with UL
®
1066/ANSI
C3750, UL 489, and IEC 60947-2 requirements . The Series
NRX circuit breakers are available in a variety of different
connection and mounting possibilities .
Continuous current rating from 800 - 1600 A and inter-
rupting capacities to 85 kA are available depending on the
applicable standard . The circuit breaker nameplate provides
complete rating information and should always be inspected
to ensure the information shown is in keeping with the
product ordered (Figure 1) . All Series NRX circuit breakers
are 100 percent rated except for UL 489 rated breakers . All
are built and test in an ISO 9002 certified facility .
A series NRX non-automatic breaker is available in a fixed or
drawout configuration, and designed in keeping with
IEC 60947-2, UL 1066, and UL 489 .
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