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Eaton NRX Series Instruction Leaflet
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Eaton NRX Series Instruction Leaflet

Breaker pxr trip unit
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Instruction Leaflet IL019238EN
Series NRX breaker PXR trip unit
field installation instructions
Contents
Section 1: General information . . . . . . . . . . . . . . .1
Section 2: Trip unit replacement . . . . . . . . . . . . . .3
Section 4: Testing/quality check . . . . . . . . . . . . . . 10

Section 1: General information

This instructional leaflet is expressly intended to
cover the Installation of a Power Xpert Release™
(PXR™) trip unit kit into the Series NRX RF and
NF power circuit breakers. These circuit breakers
may be supplied as part of complete switchboard
assemblies or as separate components and as
fixed and/or drawout products.
UL 489: PD-RF
IEC: PD-RF , IZMX40
Instructions note
These instructions apply to Series NRX type RF
and NF low-voltage power (air) circuit breakers
with PXR for the following application scenarios:
1. Replacing a PXR 20 with a new PXR 20
trip unit.
2. Replacing a PXR 25 with a new PXR 25
trip unit.
3. Upgrading a PXR 20 to a PXR 25 trip unit.
This manual does not cover replacing a Digitrip™
trip unit with a PXR trip unit or changing a PXR
trip unit to a Digitrip trip unit.
UL 489: PD-NF , Series NRX NF
IEC: PD-NF , IZMX16
UL 1066/ANSI: Series NRX NF

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Summary of Contents for Eaton NRX Series

  • Page 1: Table Of Contents

    Instruction Leaflet IL019238EN Effective July 2019 Series NRX breaker PXR trip unit field installation instructions Contents Section 1: General information ....1 Section 2: Trip unit replacement ....3 Section 3: PXR 25 trip unit upgrade .

  • Page 2: Effective July 2019

    NOT BE AFFECTED. NOTICE THIS INSTRUCTION LEAFLET DOES NOT EXPLAIN HOW TO GO FROM A LOWER CURRENT TO A LARGER CURRENT. THIS PROCEDURE IS ONLY RELATED TO TRIP UNIT REPLACEMENT OR UPGRADES. CONTACT EATON FOR CURRENT RATING RELATED CHANGES. EATON www.eaton.com...

  • Page 3: Section 2: Trip Unit Replacement

    4. Disconnect the trip unit from the breaker. Pinch the white tabs on the side of the wire harness and pull the wire harness out of the trip unit and set aside. EATON www.eaton.com...
  • Page 4 If working with the RF breaker, push in the trip unit interlock on the side of the trip unit slot prior to removing the trip unit. See picture below. ote: If working with the NF breaker, engage the wire form interlock prior to removing the trip unit. EATON www.eaton.com...
  • Page 5 The replacement of a PXR 20 trip unit to a new PXR 20 trip unit is complete. Add the appropriate modification label as indicated in Appendix A to the front cover to indicate the changes made to the breaker. EATON www.eaton.com...

  • Page 6: Section 3: Pxr 25 Trip Unit Upgrade

    4. Disconnect the trip unit from the breaker. Pinch the white tabs on the side of the wire harness and pull the wire harness out of the trip unit and set aside. EATON www.eaton.com...
  • Page 7 See picture below for location of the screws. 7 . Remove the PXR 20 wire harness. To remove each wire from the terminal, squeeze the tab in between the two wires using needle nose pliers. Set aside the PXR 20 wire harness. EATON www.eaton.com...
  • Page 8 Even numbers will be on the top row, and odd numbers will be on the bottom row. ote: If working with the NF breaker, engage the wire form interlock prior to removing the trip unit. See picture below. EATON www.eaton.com...
  • Page 9 10. Tighten the screw clockwise to secure trip unit in place. 12. The PXR 25 system requires that an Eaton External PT Module must be installed in the switchgear enclosure. The External PT Module must be wired up to the Eaton cassette breaker secondary connectors and then routed to the Eaton Series NRX breaker and associated internal PXR 25 trip unit.

  • Page 10: Section 4: Testing/Quality Check

    Operate accessories (shunt trip or UVR) and/or any internal key lock interlocks on the breaker. If any operational issues cannot be resolved, contact your local Eaton salesperson for further support. Perform functional trip unit testing via the trip unit itself or via the Power Xpert Protection Manager software as shown in Instruction Leaflet MN013003EN.
  • Page 11 Series NRX breaker PXR trip unit Instruction Leaflet IL019238EN field installation instructions Effective July 2019 EATON www.eaton.com...
  • Page 12 Eaton 1000 Eaton Boulevard Cleveland, OH 44122 United States Eaton.com © 2019 Eaton All Rights Reserved Eaton is a registered trademark. Printed in USA Publication No. IL019238EN / Z22900 All other trademarks are property July 2019 of their respective owners.