ABB REX 521 - Terminal Connections

1MRS 751108-MUM
REX 521
53
Protection Relay
Technical Reference Manual, General
4.2.6. Terminal connections
Fig. 4.2.6.-1 Rear view of REX 521 Basic
1
Fig. 4.2.6.-2 Rear view of REX 521 Medium
1
1. Service Pin is mounted if the HW version contains LON
RearViewBasic_a
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10
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17
18
X4.2
X4.1
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18
X1
27
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4
3
2
1
Service pin
1
X3.1
1
2
3
4
5
6
7
8
9
10
CE
Made in Finland
X3.2
Tx
X3.3
Rx
Data A
Data B
RS-485
RearViewMedium
1
2
3
4
5
6
7
8
9
10
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18
X4.2
X4.1
1
2
3
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5
6
7
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9
10
11
12
13
14
15
16
17
18
X1
27
26
25
24
23
22
21
20
19
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17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
RearViewMedium_a
1
Service pin
X3.1
1
2
3
4
5
6
7
8
9
10
CE
Made in Finland
X3.2
Tx
X3.3
Rx
Data A
Data B
RS-485