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DEVICE FUNCTION NUMBERS FOR USE
WITH ALL EXTERNAL DIAGRAMS
50
-
Instantaneous Element
51 - Overcurrent, Relay, Type lAC
51N- Ground Overcurrent Relay, Type lAC
52
- Power Circuit Breaker
SI - Seal-in Unit, with Target
TC - Trip Coil
A - Auxiliary contact, closed when breaker
closes.
A-C B�oS
f i g . S
Ex te rna l Con n ec t i on s of T h r e e Ty p e
I ACS I A Rel ays U sed i n Conj u nc t i on
W i th
T r i pp i n g
Reactors for Protect i on o f a Th ree-Phase C i rcu i t
Time Overcurrent Relays Type lAC
F i g .
4
E x t e rn a l Con n ec t i on s o f Th r e e T y p e
I ACS I A Rel ays Used For Phase- to-Phase an d Gr.ound
O v e rc u r r e n t P ro t ec t i on of a 3- P h a s e C i rcu i t
Jl.
A-( BUS
I
2
)
A-C TR I PP I O G
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f i g .
6
E x te r n a l Con n e c t i o n s of Three
I ACS I R Re l ay s , Used for S-Phase C i rcu i t
7
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