Eaton NRX Series Instruction Manual

Also see for Series NRX: Installation Installation instructions Instruction leaflet Instruction leaflet Instruction leaflet

Contents

1Section 1: IntroductionSeries NRX with PXR – Type NF Low Voltage Power (Air) Circuit Breaker Instruction Manual MN013001EN May 2015 www.eaton.comSection 1: IntroductionPurposeThis instructional manual is intended to generally cover theinstallation, operation, and maintenance of Series NRXTMlow voltage power (air) circuit breakers and drawout cas-settes Basic dimensional information is provided for theinstallation of both the circuit breaker and cassetteRefer to other documentation for more specific details1 IL0131098EN – Operating Manual for Series NRX PXR20/25 Trip Unit2 AD013001EN – PXR 20/25 Time Current Curves3 TD013001EN – Wiring Diagrams for PXR 20/254 Accessory field installation instruction leaflets (IL) dedi-cated to specific items are available for download atwww eaton com/seriesnrx5 Visit www eaton com/seriesnrx for additional supportdocumentationSafetyAll safety codes, safety standards, and/or regulations mustbe strictly observed in the installation, operation, and main-tenance of this equipmentWARNINGThe warnings and cautions included as part of the pro-cedural steps in this manual are for personnel safetyand protection of equipment from damage This exam-ple of a typical warning is intended to familiarize per-sonnel with the style of presentationIMPORTANTPlease read and understand these instructions beforeattempting to unpack, install, operate, or maintain thisequipment Study the breaker and its mechanism carefullybefore attempting to operate it on an energized circuitAll possible contingencies that may arise during installation,operation, or maintenance, and all details and variationsof this equipment do not purport to be covered by theseinstructions If further information is desired by purchaserregarding a particular installation, operation, or maintenanceof particular equipment, contact the local Eaton representa-tiveWARNINGSeries NRX circuit breakers are provided with safety fea-tures Nevertheless, the voltages, currents, and powerlevels available around operational equipment areextremely dangerous Under no circumstances shouldinterlocks and other safety features be made inopera-tive, as this may result in death, bodily injury, or prop-erty damageSafe PracticesTo protect personnel associated with the installation, opera-tion, and maintenance of this equipment, the following prac-tices must be followed1 Only qualified electrical personnel familiar with theequipment, its operation, and the associated hazardsshould be permitted to work on, install, or operate theequipment2 Always be certain that the primary and secondary cir-cuits are de-energized or the circuit breaker is open andremoved to a safe work location before attempting anymaintenance3 For maximum safety, only insert an open, completelyassembled breaker into an energized cell4 Always ensure that drawout circuit breakers are in oneof their designed cell positions, such as CONNECT,TEST, DISCONNECT, or WITHDRAWN A circuit breakerpermitted to remain in an intermediate position couldresult in control circuits being improperly connected,resulting in electrical failuresQualified PersonnelFor the purpose of operating and maintaining power circuitbreakers, a person should not be considered qualified ifthe individual is not thoroughly trained in the operation ofthe circuit breaker and how it interfaces with the assemblyin which it is used In addition, the individual should haveknowledge of the connected loadsFor the purpose of installing and inspecting circuit breakersand their associated assembly, a qualified person shouldalso be trained with respect to the hazards inherent toworking with electricity and the proper way to perform suchwork The individual should be able to de-energize, clear,and tag circuits in accordance with established safety prac-ticesGeneral InformationThe Series NRX low voltage power (air) circuit breaker usesan electronic tripping system It is designed, manufactured,and tested for use in both switchboard and metal-enclosedswitchgear assemblies in keeping with UL® 1066/ANSIC3750, UL 489, and IEC 60947-2 requirements The SeriesNRX circuit breakers are available in a variety of differentconnection and mounting possibilitiesContinuous current rating from 800 - 1600 A and inter-rupting capacities to 85 kA are available depending on theapplicable standard The circuit breaker nameplate providescomplete rating information and should always be inspectedto ensure the information shown is in keeping with theproduct ordered (Figure 1) All Series NRX circuit breakersare 100 percent rated except for UL 489 rated breakers Allare built and test in an ISO 9002 certified facilityA series NRX non-automatic breaker is available in a fixed ordrawout configuration, and designed in keeping withIEC 60947-2, UL 1066, and UL 489!