GEH-1753
Time Overcurrent Relays Type IAC
DEVICE
FUNCTION NUMBERS FOR USE
WITH ALL EXTERNAL DIAGRAMS
50
Instantaneous Unit
51
Overcurrent, Relay, Type IAC
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.
.li
A C BUS
-
1
2
3
.ll::l
. ,
TRJPP!t.'
�ACTOR-
.ll=l.
-
Fig. 5
(K6375668-l)
External
Connections of Three
Type
IAC51A Relays used
in
Conjunction with
Tripping
Reactors for Protection
of
aTThree-Phase Circuit.
6
A-C BUS
'·'
1-1
Fig. 4
(K-6375667-2)
External Connections of Three
Type IAC51A Relays used for Phase-to-Phase and
Ground Overcurrent Portection of a 3-Phase Circuit.
A� BUS
Fig. 6 (K-6375669-6)
E
x
t
e r
n
a
l
Connections of Three
Type
IACSlR Relays
used for
3-Phase
C
ir
c
u
i
t
Protection.
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