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6
U
Auxiliary voltage
aux
TS1...TS4
Output relays (heavy-duty)
SS1...SS4
Output relays (alarms, blockings, etc.)
IRF
Self-supervision output relay
BS1, BS2, RRES
Control signals
U1
Directional overcurrent relay module SPCS 4D11
U2
Directional overcurrent relay module SPCS 4D12
U3
Directional earth-fault relay module SPCS 2D26
U4
I/O module
U5
Energizing input module
SERIAL PORT
Serial communication port
SPA-ZC
Bus connection module
Rx/Tx
Fibre-optic cable connections
X2
IRF
16 15 14 13 12 11 10 9
Made in Finland
= 63
1 2
BS1/U1
X1
Fig. 2. Terminals of feeder protection relay SPAS 348 C
SS1
SS2
SS3
SS4
TS1
8 7
6 5
4 3
Serial Port
3 4
5
6 7 8
9 10 11 12 13 14 15 16
BS1/U2 BS1/U3
BS2
RRES
TS4
X0
1
61
I
2
62
L1
TS2
3
63
2 1
4
13
U
12
I
5
14
L2
6
16
U
23
7
17
SPA
I
8
19
L3
U
31
9
20
TS3
25
I
26
28
0
U
0
27
29
ABB Automation
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