Technical Data
Effective: May 1998 Page 21
TD.44A.01.T.E
Cutler-Hammer
Magnum DS
Metal-Enclosed
Low-Voltage Switchgear
➀ Apply in 4-Wire Systems for Main Breaker
only when no other grounded sources are
connected to the same system.
Application
Residual Main and Feeder Breaker
Sketch 1➀
Zero Sequence Feeder Breaker
Sketch 2
Source Neutral Main Breaker
Sketch 3
Note: For double-ended secondary
unit substations, ground fault protec-
tion should be as indicated on
sketches No. 4 and No. 5; however, for
this type of application, Cutler-Ham-
mer should be consulted for the actual
bill of materials to be used. The appli-
cation becomes rather complex if sin-
gle phase to neutral loads are being
served.
X
X
N1
C
B
A
N2
B5
B4
B6
B7
Trip
Unit
BKR
Secondary
Block
SOURCE
SGF
ZC
N1
N2
Neutral Sensor Only
in 4-wire system
SENSORS
ØA ØB ØC ØN
LOAD
(Neutral Sensor Polarity Critical)
(Zero Sequence Polarity Arbitrary)
N1
C
B
A
N2
B5
B4
B6
B7
Trip
Unit
BKR
Secondary
Block
SGF
ZC
N1
N2
Neutral
in 4-wire system
SENSORS
Jumper
ØA ØB ØC ØN
(Source Ground Sensor Polarity Arbitrary)
N1
C
B
A
N2
B5
B4
B6
B7
Trip
Unit
BKR
Secondary
Block
SGF
ZC
N1
N2
Neutral
SENSORS
Jumper
ØA ØB ØC
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