Figure 1-2 Connections Diagram For 7Sr21 Relay - Siemens 7SR21 Manual

+ve
2
BI 10
-ve
4
+ve
6
BI 11
-ve
8
+ve
10
BI 12
+ve
12
BI 13
+ve
14
BI 14
+ve
16
BI 15
-ve
18
+ve
20
BI 16
+ve
22
BI 17
+ve
24
BI 18
+ve
26
BI 19
-ve
28
+ve
22
-ve
24
28 GND.
+ve
2
BI 1
-ve
4
+ve
6
BI 2
-ve
8
+ve
10
BI 3
-ve
12
14 A
16 Screen
18 B
20 Term.
1A
1
2
I
L1
5A (I
3
A
4
1A
5
6
I
L2
5A (I
7
B
8
1A
9
10
I
L3
5A
(I
11
C
12
1A
13
14
I (I
4
5A
15
16
©2010 Siemens Protection Devices Limited
7SR21
BO 9
BO 10
BO 11
BO 12
BO 13
BO 14
BO 15
BO 16
C
BO 1
BO 2
BO 3
BO 4
BO 5
BO 6
B
+ve
BI 4
) +ve
BI 5
+ve
BI 6
-ve
)
+ve
BI 7
+ve
BI 8
)
+ve
BI 9
-ve
BO 7
/I )
G SEF
BO 8
A
Figure 1-2 Connections Diagram for 7SR21 Relay
7SR21 & 7SR22 Argus Description of Operation
3 1 2
1
7 C
5
Optional
11
I/O
9
15
27 28
13
17
Arrangement of terminals and modules
21
19
23
27
25
NOTES
BI =
BO =
3
1
7
9
5
13
15
11
19
17
23
21
27
25
26
18
20
22
25
24
26
28
27
19
17
23
21
1 2 1 2
B A
Data
Comms
PSU Analogue
(Optional)
27 28 27 28
Rear View
Binary Input
Binary Output
Shows contacts internal to relay case
assembly.
Contacts close when the relay chassis is
withdrawn from case
Chapter 1 Page 9 of 71