GEH-1753
Time Overcurrent Relays Type lAC
DEVICE
FUNCTION NUMBERS FOR USE
WITH ALL EXTERNAL DIAGRAMS
50
Instantaneous Unit
51
Overcurrent, Relay, Type lAC
51N -
Ground Overcurrent Relay, Type lAC
52
Power Circuit Breaker
SI
Seal-in Unit, with Target
Trip Coil
TC
A
Auxiliary contact, closed when breaker
closes.
A-C BUS
1
2
)
.li
XI
il=J.
TRIPPI•G
'I[•CTOR-
7
.ll=l.
Fig.
5 (K6375668-l)
External
Connections of Three
Type IAC51A Relays used
in Conjunction with Tripping
R
e
ac
t
ors for Protection of aTThree-Phase Circuit.
6
A-C BUS
...
ll=1
1�1
Fig.
4
(K-6375667-2)
External Connections
of
Three
Type
IACSlA Relays used
for
Phase-to-Phase and
Ground Overcurrent Portection of a
3-Phase Circuit.
A-C BUS
Fig. 6 (K-6375669-6)
External Connections of
Three
Type IACSlR Relays used for 3-Phase Circuit
Protection,
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