External Accessories
N eutral Sensing Transformer
Important
The SB series of electronic trip circuit breakers equipped
with ground fault protection may be used in the Residual
or G round Return modes. When used in the Residual
mode the orientation of the neutral sensing transformer
is important for proper operation . See illustrations below
for proper orientation of the neutral sensor for Residual
mode Ground Fault. Orientation of the neutral sensor is
not required when used in the Ground Return mode of
Ground Fault.
Grounding
Electrode -,
Standard Connection
Neutral Sensing
Transformer
(terminal face)
Reverse Connection
6
8
Bonding Jumper
LT1 1
LT12
LT1 1
LT1 2
A
B
A
B
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5Z
1 7 °
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Bonding Jumper
Grounding
Electrode
Installation of neutral transformer
Terminal Connections
If secondary disconnects or terminal block has been fac
tory mounted and the transformer has been properly ori
ented and mounted, connect transformer terminal X1 to
LT1 1
and X2 to LT1 2 using # 1 8 AWG stranded copper wire.
If left top secondary disconnects or terminal blocks are field
added , user must remove the circuit breaker cover follow
ing instructions on page
35
and
36.
Locate the two ground
wires marked
L T1 1
and LT1 2 . Properly connect these wires
to the secondary disconnect or terminal block terminals
L
T1 1
and
L
T 1 2.
Following instructions steps 1 9 and 20 on page 42, replace
the cover being careful not to pinch the wire leads.
Route wires in channel
under metal plates as
Wire positions
#8
and
# 1 5
shown.
marked on back.
-t-
.2 6
3
·+-
! Go
7
c
+-
1 :2..
I t
N
+
8
L i t (
·-
.X,
\
J s·
-
L T t ;L
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