3
1. The Power Xpert Release trip unit
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
1.4 Enhanced protection features
Table 3. Enhanced protection features.
Enhanced protection (PXR 25 only) Units Settings
ANSI 59 Voltage protection Over voltage pickup Volts 180 to 720 in steps of 1 Three modes of operation are
selectable for these protection
functions:
OFF, Alarm, or Trip.
Over voltage delay Seconds 1 to 300 in steps of 1
ANSI 27 Under voltage pickup Volts 60 to 670 in steps of 1
Under voltage delay Seconds 1 to 300 in steps of 1
ANSI 47 Voltage unbalance pickup % volts 5 to 25 in steps of 1
Voltage unbalance delay Seconds 1 to 300 in steps of 1
ANSI 46 Current protection Current unbalance pickup % Amps 5 to 25 in steps of 1
Current unbalance time Seconds 1 to 300 in steps of 1
ANSI 78V Phase loss pickup % amps 75
Phase loss delay Seconds 1 to 240 in steps of 1
ANSI 32R Power protection Reverse power pickup kW 1 to 65,500 in steps of 1
Reverse power delay Seconds 1 to 300 in steps of 1
1.5 Current, voltage, frequency, power and
energy data
Both the PXR 20 and PXR 25 provide real time metering
information regarding the loads being protected. The
PXR 25 includes monitoring of voltage and phase angle to
support power and energy data. All accuracy requires
control power (AUX) to the trip unit and is specified for a
3-phase balanced load.
Table 4. Metering data (continued).
Current metering in the PXR 20 & PXR 25 Units Accuracy
IA, IB, IC, IN
a
, IG
Amperes ± 0.5% of reading
Over the range of 10% to 120% x I
n
at 25°C (77°F).
Minimum IA, IB, IC, IN, IG Amperes
Maximum IA, IB, IC, IN, IG Amperes
THD for IA, IB, IC, IN %
Demand IA, IB, IC, IN, IG Amperes
Demand Max. IA, IB, IC, IN, IG Amperes
Voltage metering in the PXR 25 Units Accuracy
VAB, VBC, VCA (line to line) Volts ± 0.5% of reading
Over the range of 102 to 690 Vac line-to-line at 25°C
(77°F).
Minimum VAB, VBC, VCA Volts
Maximum VAB, VBC, VCA Volts
THD for VAB, VBC, VCA %
VAN, VBN, VCN (line to neutral) Volts
Minimum VAN, VBN, VCN Volts
Maximum VAN, VBN, VCN Volts
.
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