GE AKR Series User Manual

Power
Circuit
Breokers,
GEI-86134
a
1.. :"
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I
i
1. Flux shift
Trip
Device
2.
Allen-head
Screws
3. Stud
Connector
4.
Current Sensor
5.
Tap Terminal Board
6. Programmer
Unit
7.
Clamp
Bolt
8.
Sensor
Stud
Fig. 17. AKR-54-30 breaker with
SST
trip deuice
Application
of
the
Grorurd
Fault
element
on
4-
wire systems with neutral
grounded
at
the trans-
former requires
an additional,
separately
mounted
sensor
(Fig.
19)
inserted in
the
neutral
conductor;
its secondary is connected
to
a
fourth
primary
winding on
the
ground
differential
tralsformer.
See Fig.
2?.
This
"fourth-wire"
neutral sensor
is
an
electrical
duplicate
of
the
phase
sensor,
includ-
ing taps. Therefore, when
taps
are
changed on
the
phase
sensors,
those
on the
neutral sensor
must
be
correspondingly
positioned.
FIux Shift Trip
Device
-
a
low-energy, electro-
m@n receipt of a trip signal
from the
programmer
unit,
trips the
breaker by
actuating
the trip
sha-tt.
See Fig.
22.
All
components except the
neutral sensor
are
mounted
on
the
circuitbreaker.
The
phase
sensors
are
located
on
the
breaker's
back
frame.
The
pro-
grammer
unit
and
the flux
shift trip device
are
mounted
on
the
breaker's
front
frame.
These
com-
ponents
are
interconnected
by
wiring
harness
and
disconnect
plugs,
as
shown
on
the cabling diagrams
(Figs.
25
and
26).
When
used, the
neutral sensor is
separately
mounted in the
bus
or
cable compartment
of
the
switchgear.
In
drawout
construction,
its output is
automatically corurected
to the
breaker via second-
ary disconnect
blocks.
See Fig. 20.
15

GE AKR Series Specifications

General

Number of Poles	1, 2, 3
Voltage Rating	240V AC, 480V AC, 600V AC
Frame Size	AKR
Trip Unit	Thermal-Magnetic
Standards	UL, CSA
Amperage	Varies by model (15-1200)