The polarity of the holding coil current and trip coil current should be checked carefully to insure proper tripping of the
breaker. The effect of trip coil current is
always
opposite that of the holding coil current. However, if the breaker is equipped
with a bucking bar-inductive shunt combination, the holding current polarity is determined by the desired tripping direction
of current through the bucking bar.
DM2F Feeder Breaker with upper stud positive
lower stud negative.
Polarity
Factory
Connection
Connection
\
I
3
4SHC
TI
Breaker
4FHC
Holding Coil
5STC
TI
Breaker
6
5FTC
Tripping Coil
8
I
Terminal Block
on Breaker
Forward Trip
DM2F Feeder Breaker with upper stud negative
lower stud positive.
Polarity
Connection
\
Factory
Connection
I
Breaker
Coil
4SHC
Breaker
----
Tripping Coil
5STC
5
I
Terminal Block
on Breaker
Forward Trip
DM2R Rectifier Breaker with upper stud positive
lower stud negative.
Polarity
Connection
\
3
Factory
Connection
I
4SHC
Breaker
Coil
Breaker
----
Tripping Coil
5STC
+
I
Terminal Block
on Breaker
8
Reverse Trip
DM2R Rectifier Breaker with upper stud negative
lower stud positive.
Polarity
Factory
Connection
Connection
\
I
3
4SHC
TI
Breaker
4
4FHC
Holding Coil
5STC
TI
Breaker
6
5FTC
Tripping Coil
8
I
Terminal Block
on Breaker
Reverse Trip
Fig.
5.
Polarity Hookups for Proper Tripping of Breaker
4
I.B. 201
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