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Table 6. PXR trip unit protection settings and features
Protection
Slope
Long delay pickup
Overload protection (long
Long delay time @ 6 x (I
delay) (L) ANSI 51P
Long delay thermal memory
High load alarm 1
High load alarm 2
Short Delay Slope
Short Delay Pickup
Short Circuit Protection
(S) ANSI 50TD
Short Delay Time I
ZSI ANSI 68
Short Delay Time Flat
Short Delay Zone Interlock
Neutral Protection
4th Pole or
ANSI 50N
External Neutral
ANSI 51N
Instantaneous Pickup
Instantaneous Protection
Making Current Release
(I) ANSI 50P
level determined by frame
Ground Protection
Ground Fault Pickup - Trip (I
Ground Fault Pickup - Alarm
Ground (Earth) Fault
Ground Fault Delay I
Protection (G) ANSI 51G
Ground Fault Delay Flat
ZSI ANSI 68
Ground Fault Zone Interlock
Ground Fault Thermal Memory
Ground Fault Pre-alarm
Switch Positions
Maintenance Mode Protection
Maintenance Mode Pickup
(ARMS) (A) ANSI 50
Relay Contact for Remote Indication of Mode
Description applies to both the PXR 20 and PXR 25.
a
PXR trip unit and communication modules
x (I
)
n
)
Seconds
r
% x (I
)
r
% x (I
)
r
x (I
)
r
2
t @ 8 x (I
)
Seconds
r
Seconds
% x (I
)
r
x (I
)
n
A
)
x (I
)
g
n
x (I
)
n
t @ 0.625 x (I
)
Seconds
2
n
Seconds
%
x (I
)
n
MAGNUM PXR PRODUCT GUIDE PA013006EN September 2022 www.eaton.com
PXR 20
PXR 25
I
t
I
t, I
t, I
2
2
4
0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.9,
0.4 to 1.0 in steps of 0.01
0.95, 0.98, 1.0
0.5, 1, 2, 4, 7, 10, 12, 15, 20, 24 0.5 to 24 in steps of 0.1
Enable/Disable a
OFF or 50% to < High Load Alarm 2 in steps of 1.0% a
OFF or > High Load Alarm 1 to 120% steps of 1.0% a
Flat, I
t
Flat, I
2
2
1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 10
1.5 to 10 in steps of 0.1
0.1, 0.3, 0.4, 0.5
0.05 to 0.5 in steps of 0.01
0.05, 0.1, 0.2, 0.3, 0.4, 0.5
0.05 to 0.5 in steps of 0.01
Enable/Disable a
OFF, 60, 100
OFF, 60, 100
OFF, 2, 4, 5, 6, 7, 8, 10, 12, 15
OFF, 2 to 15 in steps of 0.1
Y a
Residual / Source Ground or Zero Sequence a
0.2, 0.4, 0.6, 0.8, 1.0
0.2 to 1.0 in steps of 0.01
OFF, 0.2, 0.4, 0.6, 1.0
OFF, 0.2 to 1.0 in steps of 0.01
0.1, 0.2, 0.3, 0.5, 1.0
0.1 to 1 in steps of 0.01
0.05, 0.2, 0.3, 0.5, 1.0
0.05 to 1 in steps of 0.01
Enabled with Ground Fault Pickup a
Enable/Disable a
50 to 100 of Ig in steps of 1.0 a
ON or Remote LED lights when enabled a
1.5, 2.5, 4.0, 6.0, 8.0, 10.0
Y a
3
/
t, It
1
2
t
31
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