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L 1 L2 L3
J
~
II II
I
I
r -
~
52
1\
L....
I -
DC Trip
+----4 ....... -
50/51-1
52
Fig.
3:
Fig.
30
current connections
3
51-' 50-;:4
I
__ J
3
51-2 sO-2l4
3 51-4 50--4;4
_J
.
__ J
3
51-3 50-314
J
4/2214
Fig.3c
output contact connections
5
5 5 5
Alarm
4/2214
- 6 -
Fig.3b
auxiliary supply connections
(nat applicable to
C.T.
powered version)
DC
aux. bus
+--~----~----~------
9_
SO/51
-1
8
9*
50151
-3
8
fr
termi nal
7
for
220V
mo del
Legend:
51 -1 o/e-
relay
75K 88
51-2 ole-relay 75K 88
optional
51- 3
ole-relay
7 5K 88
51- 4 01
c-relay
7 SK 88
optional
52
Circuit breaker
50 -1
high set element, optional
SO - 2 high
set
element. optional
50 - 3 high
set element, optional
50- 4 high
set
element,opti~nal
5
5
5
Auto- rec(ose
relay or similar
or alarm
External Schematic - 7SK88 Relay
d.c. powered or C.T. powered version
(
(
(
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