2
1. The Power Xpert Release trip unit
Power XPert® release triP unit for MagnuM PXr circuit breakers
MN013015EN January 2022 www.eaton.com
1.3 Primary protection features
The Time-Current Curves (TCC) for the PXR 20/25, when
used in Magnum PXR circuit breakers, are found in
document TD013172EN. All protection settings shall be
made by following the recommendations of the specifying
engineer in charge of the installation.
Table 2. Primary protection features.
Protection
PXr 20
PXr 25
Overload
protection
(long delay)
(L) ANSI 51P
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 (Ir)
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
High load alarm 1
% x (I
r
)
OFF or 50% to < high load alarm 2 in steps of 1.0%
High load alarm 2
% x (I
r
)
OFF or > high load alarm 1 to 120% steps of 1.0%
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
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
Ground
(earth) fault
protection (G)
ANSI 51G
ZSI
ANSI 68
Ground protection
Residual/source ground or zero sequence
Ground fault pickup
b
- trip (Ig) 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
b
- 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
Ground fault thermal memory
Enable/disable
Ground fault pre-alarm
%
50 to 100 of Ig in steps of 1.0
Maintenance
mode
protection
(ARMS) (A)
ANSI 50
Switch positions
ON or remote
LED lights when enabled
Maintenance mode pickup
c
x (I
n
)
1.5, 2.5, 4.0, 6.0, 8.0, 10.0
Relay contact for remote
indication of mode
Y
Notes:
If I
4
T slope is selected not all times are available, consult time-current curves.
b
Ground fault pickup is limited to a maximum of 1200 A for ANSI/UL/CSA versions to comply NEC® standards. See Section 3.6 - Ground fault settings for a
complete description of the settings.
c
Maintenance mode pickup maximum setting may be limited based on rating I
n
.
