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