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3 Line protection setting description
PXR tRiP units foR PoweR Defense molDeD case ciRcuit bReakeRs
MN012007EN March 2019 www.eaton.com
Zero sequence sensing also referred to as vectoral summation, available in certain styles, is
applicable to mains, feeders, and special schemes involving zone protection.
Ground (earth) sensing method
frame
sensor catalog #
Residual
PD2 – 60, 63, 100 Amp w/o bus-bar
PDG2XNCTD0100
PD2 – 150, 160, 200, 225, and 250 Amp w/o bus-bar PDG2XNCTD0225
PD2 – 60, 63,100 Amp for cable
PDG2XNCTB0100
PD2 – 150, 160, 200, 225, and 250 Amp for cable
PDG2XNCTB0225
PD3 for bus-bar
PDG3XNCTB0600
PD4 for bus-bar
PDG4XNCTB0800
PD5 for bus-bar
PDG5XNCTB1200
PD6 for bus-bar
PDG6XNCTB2500
Source ground / zero sequence
PD5 and PD6
Tbd
3.4.6 Special consideration for ground fault test
3.4.6.1 NEC requirements and UL standards
The National Electric Code (NEC) under Article 230-95-C requires that any ground-fault
protection system be performance tested when first installed. UL Standard 489 amd 1053
specify that instructions for ground fault testing accompany each ground fault protection
system. Please consult Instruction leaflet number IL012125EN available at www.eaton.com/
powerdefense to aid you in ground fault testing the Power Defense circuit breaker.
3.5 Motor Protection settings description
The PXR trip unit motor protection settings are easily customized to any application.
Available protection features and specific settings will vary by trip unit style and breaker
frame. Before placing any circuit breaker in operation, set each trip unit protection setting to
the values specified by the engineer responsible for the installation.
Overload and short circuit protection setting details for each trip unit and frame combination
are found in in section 9 - Detailed Protection Settings.
Overload Protection
Protection of motor loads is accomplished by the trip unit determining when a motor is
drawing currents over its rated current. An overload is a condition in which currents above
the rated value are present, but unlike a fault current, overloads may be of just a few
amperes over the rated current. Nevertheless, overloads can cause irreversible damage due
to the amount of heat released. Overload protection has a time delay. This has the purpose
of allowing short-duration overcurrent conditions, which are normal in the operation of some
types of equipment.
Short Circuit & Instantaneous Protection
Protection against short circuits and instantaneous is the same as line protection. Both can
be configured to meet a wide variety of motor protection applications.
Motor Protection Specific Functions
Motor protection circuit breakers include additional protection features which can be used to
protect equipment during certain system events, such as under/over voltage (sag/swell) and
phase current anomalies. See the table Additional Motor Protection Settings. The protection
functions have set points and/or time delays which should be matched to the specific needs
of the load. Each protection function is configured by accessing the menu system using the
LCD and buttons or by using Eaton’s Power Xpert Protection Manager software (PXPM).
