ABB Industrial IT enabled REX 521 Technical Reference Manual, General page 41

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*)
L 1 L 3
S 1
P 1
S 2
P 2
S 1
S 2
*) Power flow direction
**) The jumper is not assembled by default when
the protection relay is delivered
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Technical Reference Manual, General
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L 1
L 3
A
N
X1.1
12
1A
11
5A
10
9
1A
8
5A
7
6
1A
5
5A
4
3
1A
2
5A
1
X4.2
5
-
6
7
8
9
10
11
12
13
14
15
16
17
18
X3.1
1
2
DATA A
9
10
ACFail
TempAlarm
CT4
I
0
CT3
I
L3
CT2
I
L2
CT1
I
L1
HSPO1
TCS1
DI1
DI2
DI3
DI4
DI5
DI6
DI7
DI8
DI9
RS-485
DATA B
X4.1
+
1
Mains
2
-
5
I R F
4
3
8
7
6
SO1
10
11
SO2
9
12
13
PO1
14
15
PO2
17
+
18
PO3
X4.2
4
3
** )
2
+
1
X3.2
SERIAL BUS
X3.3
SERIAL BUS
5(; 
0
-
I
-
41