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Section 8: Troubleshooting
Step 7: When inspections are complete, secure arc chutes
in place with their mounting screws. Remove screwdriver
and verify that secondary contact assembly inner cradle
relatches.
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.
Primary contact inspection
With the arc chutes removed, visually inspect each primary
contact structure for signs of wear and/or damage with the
circuit breaker open. Series NRX primary contacts/carrier
assemblies cannot be replaced. Contact Eaton for addi-
tional information.
Miscellaneous modifications and/or changes
The topics discussed here cover additional actions that
relate to updating, maintaining, or repairing series NRX cir-
cuit breakers. Some actions may not be able to be accom-
plished in the field. In addition, this information does not
include most accessory devices that are covered by sepa-
rate instruction leaflets dedicated to individual devices.
Trip unit replacement
To replace a trip unit, refer to MN013003EN, instruction
manual for series NRX PXR 20/25.
Current sensor replacement
The Rogowski type current sensors are not field replace-
able.
Frame rating module replacement
The frame rating module is not field replaceable.
56
Series NRX with PXR - type RF low voltage power (air) circuit breakers instruction manual MN013002ENH03 September 2016 www.eaton.com
Section 8: Troubleshooting
Introduction
Table 7 will help to determine the probable causes of simple
circuit breaker problems and possible corrective actions.
Possible problems associated with the electronic trip unit
are covered in MN013003EN. If the problem cannot be
resolved with the aid of one or both of these guides, con-
tact the Eaton service center for more in-depth assistance.
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