Bulletin No. 3020IB9814
December 1998
18
(+)L G N(-)
IN+ IN- OUT+ OUT- SHLD
20 21 22 23 24
910111256781234
V
a
V
b
V
c
V
n
I
a+
I
a-
I
b+
I
b-
I
c+
I
c-
I
n+
I
n-
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3 PHASE
VOLTAGE
INPUTS
120 VOLTS
NOMINAL
AUXILIARY
CURRENT
INPUTS
5 AMPS
NOMINAL
3 PHASE
CURRENT
INPUTS
5 AMPS
NOMINAL
CONTROL
POWER
14 VA
RS-485
DATA COMMUNICATIONS
TYPE 1 ENCLOSURE
INDOOR USE ONLY
CT Shorting
Block
AØ
BØ
CØ
Line
Fuses
OPEN DELTA PT
CONNECTION
(120 V L-L
Secondaries)
Fuses
CTs (5 Amp Secondaries)
Load
CPT
(120 or 240 Vac
Secondary, 14 VA)
Fuses
Fuse
Disconnect
Switch
Note: Control power can be drawn
from phase PT inputs. See
Deriving Control Power from
Phase PT Inputs
in this chapter.
For DC control power connections,
see figure 3-10.
True Earth
Ground
VDS
Figure 3-4: 3-phase, 3-wire delta connection
Notes:
• Pay close attention to polarity marks (■) when connecting CTs and PTs.
• Installation Category II