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DEVICE FUNCTION NUMBERS FOR USE
WITH ALL EXTERNAL DIAGRAMS
50
Instantaneous E lement
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51 - Overcurrent, Relay, Type lAC
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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.
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f i g .
S
E x te r n a l
I A CS I A R e l ays U sed i n Conj u nc t i o n
Reactors for Protec t i on o f a Th ree-Phase C i rcu i t
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Jr..
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Con n e c t i o n s of T h r e e Ty p e
W i th
T r i pp i n g
Time Overcurrent Relays
4
F i g .
E x t e r n a l Con n e c t i on s o f T h r e e T y p e
I ACS I A R e l ays Used For Phase- to-Phase an d Gr.ound
O v e r c u r r e n t P ro t ec t i on of a 3- P h a s e C i r cu i t
A-( BUS
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A-C TR I PP I O G
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f i g .
E x t e r n a l
Co n n e c t i o n s of T h r e e T y p
I ACS I R Re l ay s , U s ed for S - Phase C i rcu i t P rotect i
Type lAC
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