GE AKD-8 User manual

GE
Electrical
Distribution
&
Control
8
APPLICATION
GUIDE
•
• •
••
•
*
•••
••
•
••
•
•• • • • • ••
•
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•
Courtesy of NationalSwitchgear.com

c
•
Table
of
Contents
3
General
description
Safety
and
reliability
features
4
-
8
POWER
LEADER
Power
Management
System
MicroVersaTrip
Plus
and
PM
Trip
Units
9
10
Application
data
Accessories
Electrical
characteristics
Repetitive
duty
Design
considerations
Time
current
tripping
characteristics
The
Load
Center
Principle
Power
circuit
breaker
selection
tables
Ground
detection
considerations
Automatic
transfer
(
throwover
)
equipment
11
12
-
13
14
14
15
16
-
17
18
-
19
20
-
23
24
-
25
26
27
Sizing
and
dimensional
data
Switchgear
layout
and
sizing
POWER
LEADER
instrument
panel
Floor
plans
and
side
views
28
-
35
36
-
37
3843
4447
Guideform
Specifications
48
Standards
and
references
1
Courtesy of NationalSwitchgear.com

{
'
Courtesy of NationalSwitchgear.com

General
description
circuit
breakers
,
instrumentation
,
and
other
auxiliary
circuit
protective
devices
in
single
or
multiple
source
configurations
.
AKD
-
8
switchgear
can
be
applied
either
as
a
power
distribution
unit
or
as
part
of
a
unit
substation
in
indoor
or
outdoor
construction
.
AKD
-
8
switchgear
sections
are
provided
in
either
22
”
,
30
”
or
38
”
widths
.
.
AKD
-
8
Switchgear
is
industrial
-
duty
equip
-
ment
built
to
ANSI
standards
and
uses
100
%
rated
Low
-
Voltage
AKR
Power
Circuit
Breakers
.
It
is
designed
to
have
more
mar
-
gin
within
its
ratings
to
provide
maximum
continuity
of
service
for
those
applications
subject
to
severe
duty
;
such
as
repetitive
switching
encountered
with
motor
starting
,
power
factor
correction
,
demand
control
,
load
shedding
,
etc
.
It
is
designed
to
be
operated
in
an
ambient
temperature
between
-
30
°
C
and
40
°
C
.
Type
AKR
low
-
voltage
powrer
circuit
breakers
are
available
for
.
AKD
-
8
switchgear
in
six
frame
sizes
:
•
800
A
AKR
-
30
,
30
H
,
30
L
•
1600
A
AKR
-
50
,
50
H
•
2000
A
AKRT
-
50
H
•
3200
A
AKR
-
75
,
75
H
•
4000
A
AKR
-
100
•
5000
A
.
AKR
-
125
.
AKD
-
8
switchgear
is
manufactured
in
GE
’
s
ISO
9002
certified
facility
'
in
Burlington
,
Iowa
.
It
complies
with
.
ANSI
standards
C
37.20
.
1
and
NEMA
SG
-
5
,
and
it
is
UL
list
-
ed
to
standard
1558
,
file
no
.
E
76012
.
The
switchgear
has
been
conformance
tested
according
to
ANSI
C
37.51
.
A
major
factor
contributing
to
this
extended
continuity
'
of
service
is
the
availability
'
of
renewal
parts
complete
with
detailed
maintenance
instructions
and
original
equipment
documentation
.
From
a
coordination
standpoint
,
type
.
AKR
circuit
breakers
provide
full
selectivity
'
with
each
other
and
with
other
protective
devices
.
The
bus
sizing
is
based
on
temperamre
rise
rather
than
on
current
density
'
(
as
with
switchboard
construction
)
.
ANSI
standards
require
that
switchgear
operate
at
the
ratings
of
devices
installed
.
Switchgear
short
circuit
ratings
are
based
on
two
30
-
cycle
withstand
tests
with
15
-
sec
-
ond
interval
,
performed
at
15
%
power
fac
-
tor
and
635
Vac
maximum
.
For
switch
-
boards
,
a
single
3
-
cycle
withstand
test
at
20
%
power
factor
and
600
Vac
maximum
is
performed
.
.
All
breakers
can
be
equipped
with
current
limiting
fuses
.
AKRU
-
30
and
AKRU
-
50
are
prodded
with
integrally
mounted
fuses
,
while
a
separate
fuse
carriage
is
required
for
AKRT
-
50
H
,
.
AKR
-
75
,
.
AKR
-
100
,
and
AKR
-
125
.
Low
’
-
voltage
circuit
breakers
rated
800
/
1600
/
2000
amps
can
be
stacked
in
four
-
high
combinations
resulting
in
reduced
floor
space
requirements
.
The
11
-
gauge
,
bolted
modular
-
designed
steel
frame
permits
flexibility
in
arrangements
of
breakers
and
associated
components
.
AKD
-
8
switchgear
is
available
with
the
following
maximum
nominal
ratings
:
•
600
Vac
,
250
Vdc
•
5000
Aac
,
6000
Adc
•
50
/
60
Hz
•
2200
Vac
RMS
dielectric
•
200
kA
symmetrical
short
circuit
General
Electric
’
s
.
AKD
-
8
low
-
voltage
switchgear
can
help
you
meet
today
’
s
chal
-
lenges
for
greater
productivity
;
increased
operator
safety
'
and
improved
equipment
reliability
and
maintainability
;
.
AKD
-
8
switchgear
houses
low
-
voltage
power
Courtesy of NationalSwitchgear.com

Safety
and
reliability
features
Standard
and
optional
fea
tures
are
ava
ilable
with
AKD
-
8
switchgear
in
order
to
meet
the
increasing
industry
emphasis
on
system
reliability
and
operating
personnel
safety
:
n
•
Closed
-
door
operation
Breaker
compartment
doors
have
no
ventilation
openings
,
thus
protect
-
ing
operators
from
hot
ionized
gases
vented
by
the
breaker
during
circuit
interruption
.
•
Closed
-
door
drawout
True
closed
-
door
drawout
construction
is
standard
with
all
AKD
-
8
equip
-
ment
The
breaker
compartment
doors
remain
stationary
'
and
closed
while
the
breaker
is
racked
out
from
the
connected
position
,
through
test
,
to
the
disconnected
position
.
Doors
are
secured
with
nigged
14
-
tum
latches
.
•
Closed
-
door
control
circuit
accessibility
A
standard
slide
-
out
instrumentation
tray
is
located
above
each
breaker
compartment
,
minimizing
cross
-
hinge
wiring
.
When
required
,
indicating
lights
and
test
switches
can
be
mounted
on
the
front
of
the
tray
.
Fuses
for
close
and
trip
circuits
can
be
mounted
inside
the
tray
and
are
accessible
with
the
tray
pulled
out
.
Routine
wiring
inspections
and
fuse
checks
or
fuse
replacements
can
be
performed
with
the
breaker
compartment
door
closed
,
protecting
operators
from
energized
primary
circuits
.
•
Closed
-
door
trip
unit
setup
and
display
Optional
MicroVersaTrip
Remote
Display
provides
safe
,
closed
-
door
access
to
the
AKR
breaker
’
s
MicroVersaTrip
Plus
or
MicroVersaTrip
PM
trip
unit
metering
,
status
and
setup
functions
.
)
Courtesy of NationalSwitchgear.com

C
Easy
-
to
-
use
breaker
interlocking
and
locking
features
minimize
the
risk
of
operational
errors
:
•
Low
-
voltage
power
circuit
breaker
locking
.
As
a
standard
feature
,
the
low
-
voltage
power
circuit
breaker
can
be
padlocked
in
the
open
position
with
a
%
"
shank
padlock
to
prevent
unauthorized
closing
and
racking
.
•
Breaker
insertion
and
withdrawal
interlocks
Interlocks
prevent
racking
of
the
breaker
in
or
out
when
the
breaker
contacts
are
closed
.
Breakers
are
trip
free
when
not
in
the
connect
or
test
position
.
A
superior
bus
system
offers
different
levels
of
protection
:
•
Fully
tin
-
plated
copper
bus
Fully
tin
-
plated
copper
main
and
riser
bus
is
a
standard
feature
on
AKD
-
8
equipment
.
Tin
plating
provides
superior
corrosion
protection
,
especially
for
application
for
the
pulp
and
paper
and
waste
treatment
industries
where
corrosive
agents
rou
-
tinely
exist
GE
’
s
bus
bars
are
tin
-
plated
after
forming
and
punching
to
ensure
completely
plated
bolt
holes
and
bar
edges
.
Sliding
contact
surfaces
,
such
as
breaker
stab
tips
,
are
fully
silver
-
plated
.
Silver
-
plated
bolted
connections
are
avail
-
able
as
an
option
.
Bus
system
Bare
bus
is
provided
as
standard
on
AKD
-
8
switchgear
.
In
this
configuration
,
there
are
no
covers
to
remove
,
so
all
bus
connections
are
easily
accessible
for
maintenance
.
Note
that
a
horizontal
isolation
barrier
is
provided
between
the
vertical
buses
and
every
main
and
tie
breaker
for
added
safety
in
the
event
of
a
fault
.
An
insulated
/
isolated
bus
system
that
fully
insu
-
lates
the
horizontal
main
bus
with
a
fluidized
epoxy
coating
and
isolates
each
phase
of
the
vertical
riser
bus
is
available
as
an
option
.
Accessibility
to
main
bus
joints
is
provided
by
replace
-
able
covers
and
no
live
connections
are
reachable
from
the
rear
except
the
breaker
load
side
terminals
.
Bus
compartmentation
is
also
available
as
an
optional
feature
on
.
AKD
-
8
switchgear
.
Vertical
and
horizontal
busses
are
isolated
from
die
cable
com
-
partment
by
glass
reinforced
polyester
barriers
.
77
:
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Courtesy of NationalSwitchgear.com

Safety
and
reliability
features
(
continued
)
The
breaker
compartment
is
designed
to
provide
operator
and
system
safety
options
:
•
Isolated
breaker
compartment
Each
circuit
breaker
is
located
in
a
completely
enclosed
ventilated
compartment
with
grounded
steel
barriers
to
minimize
the
possibility
of
fault
communication
between
com
-
partments
.
A
breaker
position
switch
is
optionally
available
.
•
Safety
shutters
Safety
shutters
are
optionally
available
in
breaker
compart
-
ments
.
They
protect
operators
from
accidental
contact
with
live
conductors
when
the
breaker
Ls
withdrawn
.
Safety
'
shutters
are
provided
as
a
standard
feature
on
reverse
fed
breakers
.
•
Defeatable
door
interlock
This
option
prevents
inadvertent
opening
of
the
compart
-
ment
door
unless
the
breaker
is
in
the
disconnect
position
.
This
provision
is
made
for
authorized
defeat
of
intedock
.
•
Padlockable
door
latch
This
optional
feature
enables
padlocking
of
the
door
latch
in
order
to
prevent
unauthorized
entry
'
into
the
breaker
com
-
partment
)
•
Breaker
rejection
feature
A
rejection
system
is
provided
as
standard
in
each
breaker
compartment
to
prevent
the
insertion
of
a
breaker
with
inad
-
equate
short
circuit
and
/
or
incorrect
continuous
current
ratings
.
IF
®
•
Drawout
padlock
provision
A
mechanism
padlock
device
is
provided
as
standard
to
lock
out
the
drawout
mechanism
in
test
or
disconnect
position
.
This
provision
will
accept
up
to
three
padlocks
with
a
%
"
shank
.
•
Key
interlocks
This
option
provides
for
compulsory
locking
of
the
breaker
in
the
open
,
trip
-
free
position
w
'
hen
fully
connected
.
Applicable
schemes
would
be
mechanical
interlocking
of
two
breakers
so
only
one
can
be
closed
at
a
time
,
or
,
in
load
center
unit
sub
-
stations
,
interlocking
of
the
primary
'
switch
and
secondary
'
main
breaker
such
that
the
secondary
'
main
must
be
open
before
the
primary
switch
can
be
operated
.
Single
and
double
key
locks
are
available
.
Key
locking
does
not
prevent
operation
when
the
breaker
is
in
test
or
disconnect
position
.
m
70
.
Courtesy of NationalSwitchgear.com

Installation
and
maintenance
are
made
easy
with
these
design
features
:
•
Accessibility
Accessibility
to
equipment
compartments
provides
easy
main
-
tenance
of
the
breaker
compartment
area
and
control
circuit
elements
(
located
in
drawout
tray
)
,
as
well
as
convenient
inspection
of
the
bolted
bas
connections
.
r
)
v
*
/
t
{
*
!
r
.
•
Cable
space
Conduit
entrance
area
meets
NEC
]
requirements
.
Extended
depth
frame
options
are
available
in
7
"
and
14
"
sizes
for
appli
-
cations
requiring
additional
cable
space
.
•
Breaker
lifting
device
Installed
on
top
of
the
switchgear
,
this
rail
mounted
hoist
provides
the
means
for
installing
and
removing
breakers
from
the
equipment
.
This
is
a
standard
feature
on
outdoor
walk
-
in
construction
and
an
optional
feature
on
indoor
construction
.
•
Control
circuit
isolation
Control
wires
are
run
between
compartments
in
steel
riser
channels
O
.
Customer
terminal
blocks
are
located
in
metal
enclosed
wire
troughs
in
the
rear
cable
area
©
.
Intercubicle
wiring
is
run
in
a
wireway
on
top
of
the
switchgear
where
interconnection
terminal
blocks
are
located
©
.
Courtesy of NationalSwitchgear.com

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Safety
and
reliability
features
(
continued
)
GE
’
s
manufacturing
processes
and
testing
set
the
quality
standards
in
the
switchgear
industry
:
•
Paint
finish
AKD
-
8
switchgear
is
protected
by
the
“
E
-
coat
"
paint
system
consisting
of
a
“
cathodic
electrodepositioir
process
employing
the
same
principle
used
in
electroplating
:
An
electrically
charged
object
immersed
in
a
bath
of
oppositely
charged
particles
will
attract
and
become
coated
with
those
particles
.
In
the
process
,
switchgear
parts
are
conveyed
through
a
seven
-
stage
washing
process
,
where
they
are
thoroughly
cleaned
,
surface
prepared
,
chrome
-
sealed
and
thoroughly
rinsed
.
Next
,
the
parts
are
immersed
in
an
electrocoating
tank
,
where
they
receive
an
epoxy
7
coating
0.7
to
0.8
mils
thick
on
every
surface
.
After
a
rinse
,
the
parts
enter
a
curing
oven
,
where
the
coating
is
baked
,
fusing
it
to
the
metal
and
ensuring
a
hard
,
uniform
finish
.
The
resulting
ANSI
-
61
light
gray
paint
finish
far
exceeds
the
requirements
of
UL
1558
and
ANSI
C
37.20
.
1
,
which
requires
,
at
a
minimum
,
passing
a
200
-
hour
salt
spray
test
.
Periodic
testing
by
an
independent
laboratory
7
subjected
the
“
E
-
coat
”
to
1
,
000
hours
of
a
salt
spray
7
,
2
,
000
hours
in
a
humidity
cabinet
,
plus
acid
and
alkaline
resistance
tests
,
spot
and
stain
tests
,
marring
tests
and
impact
and
flexibility
tests
.
These
tests
proved
that
AKD
-
8
switchgear
can
handle
different
severe
operating
environments
.
V
•
Seismic
test
The
AKD
-
8
equipment
has
been
seismically
tested
for
Zone
4
to
certify
7
its
capability
7
to
withstand
the
most
severe
earthquake
conditions
and
that
it
meets
seismic
require
-
ments
of
the
USA
Uniform
Building
Code
.
•
Complete
and
accurate
documentation
The
AKD
-
8
design
makes
extensive
use
of
computer
-
aided
engineering
and
design
.
All
customer
documentation
is
generated
via
linked
engineering
and
production
systems
for
seamless
ordering
of
materials
and
manufacturing
of
parts
.
This
integration
and
linking
of
systems
assures
consistently
accurate
customer
and
manufacturing
documentation
and
optimized
equipment
designs
,
all
driven
by
the
engineers
system
inputs
.
Courtesy of NationalSwitchgear.com

POWER
LEADER
Power
Management
System
Power
management
at
its
best
The
POWER
LEADER
system
is
specifically
designed
to
grow
with
your
needs
.
Because
the
system
is
easily
expandable
,
you
can
add
to
its
capabilities
as
your
needs
grow
,
eliminating
the
risk
of
having
to
start
over
with
a
whole
new
system
sometime
in
the
future
.
Inside
every
switchgear
lineup
flow
’
s
a
large
amount
of
informa
-
tion
.
The
data
is
in
the
form
of
power
(
volts
,
amps
,
waveform
)
passing
through
the
equipment
.
With
the
proper
devices
,
you
can
selectively
access
this
wealth
of
information
,
and
use
it
to
become
more
efficient
and
more
productive
.
This
is
what
power
management
systems
are
all
about
With
a
system
in
place
you
can
benefit
from
:
•
Reduced
energy
'
costs
•
Less
downtime
•
Improved
predictive
maintenance
•
Faster
corrective
maintenance
•
Increased
safety
•
Higher
productivity
•
Improved
power
quality
’
As
newer
technologies
become
available
,
you
are
also
assured
of
a
convenient
cost
-
effective
migration
path
,
should
you
wish
to
upgrade
your
POWER
LEADER
system
.
The
POWER
LEADER
system
also
offers
the
components
nec
-
essary
to
monitor
,
protect
and
control
devices
and
equipment
operating
in
two
or
more
locations
,
giving
you
even
greater
free
-
dom
to
expand
your
system
.
Key
capabilities
include
:
•
System
monitoring
and
metering
•
.
Alarm
management
•
Reporting
and
trending
•
Power
distribution
and
device
control
•
Cost
management
•
Predictive
maintenance
•
Power
quality
analysis
•
Dynamic
,
real
-
time
graphic
display
’
s
of
component
status
and
operation
It
should
come
its
no
surprise
that
virtually
all
switchgear
is
now
shipped
with
power
management
features
.
What
began
as
an
option
is
fast
Incoming
an
absolute
necessity
.
The
POWER
LEADER
family
of
products
offers
all
the
power
management
benefits
stated
above
,
along
with
extensive
growing
capability
;
easy
upgrade
through
open
architecture
and
a
complete
range
of
services
such
as
technical
assistance
,
start
-
up
support
,
and
on
-
site
training
.
Courtesy of NationalSwitchgear.com

MicroVersaTrip
Plus
and
MicroVersaTrip
PM
trip
unit
systems
The enhanced
MicroVersaTrip
Plus and
MicroVersaTrip
PM
system
for
AKR
Low
-
Voltage
Power
Circuit
Breakers consists
of
the
trip
unit
,
the
trip
actuator
,
current
sensors
and
rating
plugs
.
The
term
“
trip
unit
systems
”
applies
to
the
combination
of
these
four
components
,
which
form
the solid
-
state
circuit
breaker
tripping
system
.
&
A
‘
V
'
-
Ni
MicroVersaTrip
Plus and
MicroVersaTrip
PM
trip
units
continue
to
use
GE
’
s
proven
technique
of
measuring
the
true
RMS
currents
(
and
voltages
for
MicroVersaTrip
PM
trip
units
)
of
both
sinusoidal
and
harmonically
distorted
waveforms
.
The
frequent
sampling
(
64
times
per
cycle
)
allows
precise
calculations
of
the
true
RMS
current
The
sampling
rate
allows
waveform
measurements
up
to
the
31
st
harmonic
to
achieve
accuracy
-
of
99
%
.
True
RMS
sensing
avoids
potential
underprotection
or
overprotection problems
associated with
peak
-
sensing tripping
systems
.
1
.
'
v
|
Mill
111
tm
m
m
MicroVersaTrip
Plus
and
MicroVersaTrip
PM
trip
units
provide
a
complete
range
of
standard
and
optional
functions
.
All
trip
units utilize
a
series
of
interchangeable
rating
plugs
.
Standard
functions
:
Optional
functions
:
r
.
n
Protection
•
Long
-
time
•
Instantaneous
Status
•
Trip
target
(
trip
type
)
•
Trip
information
(
magnitude
and
phase
)
•
Trip
operations
counters
Metering
display
•
Phase
current
(
selectable
among
phases
)
•
Short
-
time
protection
,
with
selectable
I
“
t
.
•
Ground
Fault
protection
,
with
selectable
I
2
t
.
•
Defeatable
ground
fault
,
with
selectable
I
2
t
.
•
Switchable
instantaneous
/
short time
and
ground
fault
•
High
-
range
(
fixed
)
instantaneous
overcurrent
protection
.
•
Zone
-
selective
interlock
,
for
ground
fault
only
or
for
both
ground
fault
and short
-
time
protection
.
1
-
3
Additional
functions
are
available
only
with
MicroVersaTrip
PM
trip
unit
:
•
Communication
and
metering
•
Communication
,
metering
and
protective
relaying
Communication
:
Protective
relaying
•
Undervoltage
•
Overvoltage
•
Voltage
unbalance
•
Current
unbalance
•
Power
reversal
Remote
communication
with
POWER
LEADER
(
communication network
(
commnet
)
Metering
:
•
Voltage
(
V
)
•
Energy
(
kWh
/
MWh
/
GWh
)
•
Real
power
(
kW
/
MW
)
•
Total
power
(
kVA
/
MVA
)
•
Demand
power
(
kW
/
MW
)
•
Peak demand
power
(
kW
/
MW
)
•
Frequency
(
Hz
)
I
Courtesy of NationalSwitchgear.com

Application
data
Basic
ratings
1
AKR
low
-
voltage
power
circuit
breakers
with
Type
MicroVersaTrip
Plus
and
PM
trip
units
are
rated
for
short
-
time
withstand
current
and
interrupting
capacity
(
RMS
symmetrical
)
.
.
AKR
circuit
breakers
are
100
%
ANSI
rated
.
Table
11.1
show
’
s
the
maximum
short
-
time
rating
for
30
-
cycle
duration
at
50
/
60
Hz
.
Table
11.2
Overcurrent
trip
device
current
ratings
in
amperes
Table
11.1
Summary
of
breaker
ratings
MicroVersaTrip
Plus
&
PM
Short
circuit
ratings
RMS
symmetrical
Sensor
rating
(
amps
)
Rating
plug
(
amps
)
Breaker
frame
kA
Rated
voltage
(
Nominal
)
60
,
80
,
100
,
125
,
150
150
,
200
,
225
,
250
,
300
,
400
300
,
400
,
450
,
500
,
600
,
700
,
800
AKR
-
30
AKR
-
30
H
AKR
-
30
L
150
With
Without
instantaneous
Frame
instantaneous
Breaker
size
400
(
amps
)
Short
-
time
trip
trip
60
Hz
type
800
800
30 30
30
AKR
-
30
AKR
-
30
H
AKR
-
30
L
AKR
-
50
AKR
-
50
H
AKRT
-
50
H
AKR
-
75
AKR
-
75
H
AKR
-
100
AKR
-
125
300
,
400
,
450
,
500
,
600
,
700
,
800
600
,
800
,
1000
,
1100
,
1200
,
1600
AKR
-
50
AKR
-
50
H
800
42
42
800
42
1600
42
800
42
65
750
,
800
,
1000
,
1200
,
1500
,
1600
,
2000
AKRT
-
50
H
2000
1600
42
42
42
65
1600
65 65
AKR
-
75
AKR
-
75
H
1200
,
1600
,
2400
,
3200
3200
65
600
2000
65
65
65 65
65
3200
1600
,
2000
,
2500
,
3000
,
3600
,
4000
.
AKR
-
100
4000
3200
85
85
85
4000
85 85 85
3200
,
4000
,
5000
AKR
-
125
X
=
Rating
plug
amps
5000
S
=
Sensor
amp
rating
5000
85 85
85
AKR
-
30
AKR
-
30
H
AKR
-
30
L
AKR
-
50
AKR
-
50
H
AKRT
-
50
H
AKR
-
75
AKR
-
75
H
AKR
-
100
AKR
-
125
800
30 30
30
800
42 42
42
Table
11.3
Fused
breaker
ratings
(
Maximum
600
Vac
50
/
60
Hz
)
Fuse
rating
(
amps
)
65
800
65 65
1600
50
50
50
Interrupting
rating
(
kA
)
RMS
sym
.
1600
65 65
65
Frame
size
(
amps
)
Breaker
2000
65
65
65
480
Max
.
O
Min
.
type
3200
65
65 65
1600
200
AKRU
-
30
AKRU
-
50
AKRT
-
50
H
©
AKR
-
75
©
AKR
-
100
©
AKR
-
125
©
800
300
3200
85
85
85
2500
200
1600
450
4000
85 85
85
5000
85
85 85
2000
2500
200
2000
800
30
42
30
AKR
-
30
AKR
-
30
H
AKR
-
30
L
AKR
-
50
AKR
-
50
H
AKRT
-
50
H
AKR
-
75
AKR
-
75
H
AKR
-
100
AKR
-
125
2000
4000
200
3200
800
42
50
42
5000
200
4000
2000
65
65
65
800
5000
50
5000
5000
200
1600
50
65
65 65
65
1600
O
The
maximum
fuse
rating
is
the
largest
fuse
which
tests
show
will
result
in
proper
performance
of
the
breaker
and
fuse
in
combination
under
short
circuit
conditions
.
Only
Gould
-
Shawmut
fuses
should
be
used
for
proper
coordination
.
©
Fuses
are
mounted
on
separate
fuse
rollout
element
.
240
65 65
65
2000
3200
65
85
65
3200
85
130
85
130
85
4000
85
130
85
5000
85
Courtesy of NationalSwitchgear.com

Accessories
Undervoltage
trip
device
The
undervoltage
trip
derice
protects
against
harmful
drops
in
line
voltage
by
automatically
tripping
the
breaker
.
This
derice
is
set
to
pick
up
at
approximately
85
%
of
bus
voltage
,
and
drop
out
between
30
%
and
60
%
.
The
UV
device
is
also
available
with
an
optional
static
time
-
delay
unit
.
This
unit
offers
a
field
-
adjustable
two
-
to
six
-
second
delay
between
undervoltage
occurrence
and
breaker
trip
to
prevent
potential
nuisance
tripping
due
to
momentary
'
loss
of
voltage
.
The
time
-
delay
unit
is
mounted
externally
to
the
breaker
.
It
is
rated
125
Vdc
or
250
Vdc
or
208
/
240
Vac
,
50
or
60
Hz
.
For
any
other
AC
source
voltage
,
a
control
power
transformer
with
a
240
V
secondary
'
rated
at
least
100
VA
is
required
.
Table
12.1
Undervoltage
trip
device
operating
currents
Current
(
amps
)
Nominal
control
voltage
Frequency
Operating
voltage
range
Inrush
open
Sealed
closed
Hz
DC
24
0.38
0.38
Pickup
at
80
%
of
nominal
control
voltage
drop
out
at
30
-
60
%
of
nominal
control
voltage
DC
48
0.19
0.19
125
DC
0.08
0.08
250
DC
0.04
0.04
60
120
0.66
0.24
240
60
0.37
0.12
Bell
alarm
(
with
or
without
lockout
)
The
bell
alarm
is
available
as
one
or
two
“
a
,
”
one
or
two
“
b
,
”
or
one
“
a
”
and
one
“
b
.
”
It
is
activated
when
the
breaker
is
tripped
by
any
means
(
automatic
)
other
than
the
manual
trip
button
or
the
shunt
trip
device
.
The
contacts
may
be
used
for
remote
indication
of
an
automatic
trip
.
The
lockout
feature
is
available
to
mechanically
lock
the
breaker
“
open
”
when
the
device
is
activated
.
“
Reset
”
is
accomplished
through
oper
-
ation
of
the
manual
trip
button
.
The
bell
alarm
is
available
without
the
lockout
feature
when
so
specified
.
Table
12.2
Bell
alarm
contact
ratings
Rating
(
amperes
)
Control
voltage
Inrush
Continuous
125
2.5
2.5
DC
250
0.9
0.9
120
30
10
60
Hz
240
15
5
AC
480
7
3
Remote
dose
solenoid
(
for
manually
-
operated
AKR
-
30
,
AKR
-
50
,
AKRT
-
50
H
breakers
)
The
solenoid
provides
a
means
to
electrically
close
the
above
breakers
from
a
remote
location
.
It
may
be
controlled
by
a
switch
or
push
button
for
five
-
cycle
closing
.
Breaker
must
be
charged
locally
.
Table
12.3
Remote
dose
solenoid
ratings
I
Rating
(
amperes
)
Control
voltage
Inrush
Continuous
48
2.7
0.58
DC
125
1.3
0.32
250
0.68
0.15
120
2.0
0.4
60
Hz
AC
240
1.0
0.2
Courtesy of NationalSwitchgear.com

Auxiliary
switch
The
auxiliary
switch
is
used
for
indication
of
breaker
main
contact
position
.
It
is
available
on
manually
oper
-
ated
circuit
breakers
in
groupings
of
four
or
ten
contacts
(
2
or
5
“
a
”
and
2
or
5
“
b
”
)
,
and
on
electrically
oper
-
ated
breakers
in
groupings
of
6
or
12
contacts
(
3
or
6
“
a
”
and
3
or
6
“
b
”
)
.
All
contacts
feature
rugged
dou
-
si
*
ble
break
construction
.
©
.
jV
-
<
Table
13.1
Auxiliary
switch
control
ratings
and
contact
sequence
Auxiliary
switch
contact
sequence
Auxiliary
switch
control
ratings
O
Rating
(
Amperes
)
CB
main
contacts
“
A
”
contact
14
B
“
contact
Non
-
inductive
Inductive
Control
voltage
Open
or
tripped
Open
Closed
25
48
Closed
Closed
Open
O
Limited
to
20
A
continuous
ratings
of
switch
on
all
breakers
and
to
15
A
continuous
rating
of
#
16
wire
on
draw
-
out
breakers
.
©
Shunt
tip
requires
one
“
a
”
contact
;
remote
close
requires
one
“
b
"
contact
;
closing
circuit
requires
one
"
b
"
contact
.
6.3
DC
125
11
1.8
250
2
50
75
115
60
Hz
50
25
240
AC
25
12
480
Shunt
trip
The
shunt
trip
offers
remote
electrical
tripping
of
the
breaker
.
It
is
usually
controlled
by
a
switch
or
push
-
button
and
may
also
be
used
in
conjunction
with
protective
relays
for
automatic
tripping
.
The
shunt
trip
coil
is
rated
for
intermittent
duty
.
When
factory
installed
it
is
supplied
with
a
cutoff
switch
that
automatically
removes
control
power
following
a
breaker
trip
.
Table
13.2
Shunt
trip
operating
currents
v
|
-
'
Current
(
Amperes
)
Nominal
control
voltage
Operating
voltage
range
Inrush
open
Sealed
closed
Frequency
Hz
DC
30
8.3
8.3
24
14
4.5
DC
28
60
4.5
48
2.0
DC
70
140
2.0
125
1.0
DC
140
280
1.0
250
12.3
10.8
120
60
95
127
3.9
3.4
240
60
190
254
Electrical
lockout
device
(
manual
breakers
only
)
The
electric
lockout
device
provides
a
means
to
electrically
enable
or
disable
manual
closing
of
a
circuit
breaker
.
This
electromechanical
device
consists
of
a
coil
with
winding
that
must
be
energized
to
close
the
breaker
.
Once
the
breaker
is
closed
,
loss
of
voltage
will
not
trip
the
breaker
.
A
manual
bypass
interlock
is
provided
for
initial
startup
.
Refer
to
the
UV
device
for
ratings
and
coil
characteristics
.
(
Note
:
Interlocking
of
electrically
operated
circuit
breakers
does
not
require
an
electric
lockout
device
.
)
Key
interlock
provision
Key
interlock
prevents
closing
of
the
circuit
breaker
unless
the
key
is
inserted
in
the
key
interlock
.
With
the
key
removed
,
the
breaker
is
held
in
a
mechanically
trip
-
free
condition
.
Operation
counter
The
operation
counter
mounts
on
the
breaker
as
a
five
-
digit
,
non
-
resettable
counter
actuated
by
the
breaker
cam
shaft
.
Open
-
fuse
lockout
device
The
open
-
fuse
lockout
device
(
provided
with
any
fused
breaker
)
automatically
trips
the
breaker
if
one
of
the
fuses
opens
.
The
breaker
is
locked
open
until
the
fuse
is
replaced
and
the
reset
button
of
the
phase
involved
is
reset
Courtesy of NationalSwitchgear.com

Electrical
characteristics
(
low
-
voltage
circuit
breakers
)
Table
14.1
Charging
and
dosing
operating
currents
Anti
-
pump
Relay
"
W
"
Control
Relay
“
X
”
Closing
Solenoid
Motor
current
(
amps
)
Rated
amps
Rated
Amps
Rated
amps
Nominal
control
voltage
Min
.
Min
.
Min
.
Fuse
selection
(
amps
)
Charging
time
(
sec
.
)
Freq
.
Voltage
range
Sus
-
(
volts
)
pickup
Sealed
closed
Inrush
open
(
volts
)
pickup
Inrush
open
Sealed
closed
(
volts
)
pickup
Inrush
open
Sealed
closed
Hz
Inrush
tained
AKR
-
30
/
50
/
T
50
48
V
DC
38
-
56
40
10
38
0.063 0.063
30
4.10
4.10
38
3.58 3.58
15
1.5
125
V
DC
100
-
140
27
5
85
0.024 0.024
90
1.05
1.05
100
1.75 1.75
6
1.0
DC
250
V
200
-
280
13
3
170
0.015
0.015
180
0.53
0.53
200
0.88 0.88
6
1.0
120
V
60
104
-
127
25
5
95
0.090
0.052
95
1.00
0.14
98
2.60
0.35
6
0.9
240
V
60
208
-
254
12
3
190
0.064
0.036
190
0.50
0.07
0.17
196
1.30
6
0.9
AKR
-
75
/
100
/
125
48
V
DC
38
-
56
22.0
16.5
38
0.063 0.063
30
4.10
4.10
38
2.70 2.70
20
2.0
DC
125
V
25.0
7.0
100
-
140
85
0.024 0.024
90
1.05
1.05
100
1.30
1.30
10
1.7
DC
250
V
200
-
280
3.2
13.0
170
0.015
0.015
180
0.53
0.53
200
0.68
0.68
10
1.7
120
V
8.1
60
104
-
127
25.0
95
0.090
0.052
95
1.00
0.14
2.60
0.35
98
10
1.5
240
V
60
208
-
254
11.7
3.5
190
0.064
0.036
190
0.50
0.07
196
1.30
0.17
10
1.3
Table
14.2
Coil
resistance
-
DC
Ohms
@
25
°
C
(
AKR
-
30
/
50
/
T
50
/
75
/
100
/
125
)
Nominal
control
voltage
Anti
-
pump
relay
“
W
"
Control
relay
Frequency
Hz
“
X
"
Shunt
trip
Undervoltage
24
V
DC
N
/
A
N
/
A
3
64
DC
48
V
802
12
11
240
125
V
DC
5000
119
64
1600
250
V
DC
16400
476
260
6700
120
V
60
450
54
3.9
25.4
240
V
60
1450
300
25.4
100
Repetitive
duty
least
one
opening
operation
at
rated
short
-
circuit
current
.
After
completion
of
this
series
of
operations
,
functional
part
replace
-
ment
and
general
senicing
may
be
necessary
.
Circuit
breakers
are
designed
primarily
to
perform
the
function
of
circuit
interruption
under
short
-
circuit
conditions
.
Nevertheless
,
modem
circuit
breakers
’
mechanisms
are
capable
of
many
operations
under
full
-
load
operation
and
in
-
rush
condi
-
tions
such
as
those
encountered
in
motor
starting
applications
.
Industry
standards
have
been
established
for
the
minimum
per
-
formance
,
as
indicated
in
Table
14.3
.
With
adequate
mainte
-
nance
,
GE
breakers
can
be
expected
to
exceed
the
standards
.
This
standard
applies
to
all
parts
of
a
circuit
breaker
that
func
-
tion
during
normal
operation
.
It
does
not
apply
to
other
parts
,
such
as
overcurrent
tripping
devices
that
function
only
during
infrequent
abnormal
circuit
conditions
.
Table
14.3
Repetitive
duty
and
normal
maintenance
Number
of
operations
rated
continuous
current
switching
©
@
©
Number
of
operations
no
-
load
closing
and
opening
Number
of
operations
in
-
rush
current
Power
-
operated
circuit
breakers
,
when
operating
under
usual
service
conditions
,
shall
be
capable
of
operating
the
number
of
times
specified
in
the
following
table
.
The
operating
conditions
and
the
permissible
effect
of
such
operations
upon
the
breaker
are
listed
below
and
in
the
footnotes
of
Table
14.3
.
For
instance
,
the
breaker
should
be
operated
with
rated
control
voltage
applied
.
The
frequency
of
operation
should
not
exceed
20
in
10
minutes
or
30
in
an
hour
(
rectifiers
or
other
auxiliary
devices
may
further
limit
the
frequency
of
operation
)
.
Servicing
consisting
of
adjusting
,
cleaning
,
lubricating
,
tightening
,
etc
.
,
as
recommended
by
the
maintenance
manual
is
to
be
done
at
no
greater
interval
than
shown
in
the
column
tided
“
Number
of
operations
between
servicing
”
in
Table
14.3
.
No
functional
parts
should
require
replacement
during
the
listed
operations
.
The
circuit
breaker
should
be
in
condition
to
carry
its
rated
continuous
current
at
rated
maximum
voltage
and
perform
at
Circuit
breaker
frame
size
(
amperes
)
Number
of
operations
between
servicing
switching
O
©
o
800
1750
2800
9700
1400
1600
500
800
3200
400
2000
500
800
3200
400
3200
250
400
1100
4000
250
400
1100
5000
250
O
Servicing
consists
of
adjusting
,
cleaning
,
lubricating
,
tightening
,
etc
.
,
as
recommend
-
ed
by
the
manufacturer
.
When
current
is
interrupted
,
dressing
of
contacts
may
be
required
as
well
.
The
operations
listed
are
on
the
basis
of
servicing
at
intervals
of
six
months
or
less
.
©
With
closing
and
opening
currents
up
to
the
continuous
current
rating
of
the
circuit
breaker
at
voltages
up
to
the
rated
maximum
voltage
(
85
%
or
higher
power
factor
)
.
©
The
number
of
operations
was
determined
with
closing
currents
up
to
600
%
and
opening
currents
up
to
100
%
(
80
%
power
factor
or
higher
)
of
the
continuous
current
rating
of
the
circuit
breaker
at
voltages
up
to
the
rated
maximum
voltage
.
With
closing
and
opening
currents
up
to
600
%
(
50
%
power
factor
or
less
)
of
the
continuous
cur
-
rent
rating
of
the
circuit
breaker
at
voltages
up
to
rated
maximum
voltage
,
the
number
of
operations
shown
should
be
reduced
to
10
%
of
the
number
listed
in
the
column
.
©
If
a
fault
operation
occurs
before
the
completion
of
the
listed
number
of
operations
,
servicing
is
recommended
and
possible
functional
part
replacement
may
be
necessary
depending
on
previous
accumulated
duty
,
fault
magnitude
,
and
expected
future
operations
.
400
1100
Courtesy of NationalSwitchgear.com

Design
considerations
Altitude
correction
factors
When
applying
low
-
voltage
power
circuit
breakers
at
altitudes
greater
than
6
,
600
feet
,
their
continuous
current
rating
must
be
modified
because
a
higher
temperature
use
will
be
experi
-
enced
for
a
given
current
rating
.
The
voltage
ratings
must
also
be
modified
because
of
the
lower
dielectric
strength
of
the
air
.
The
short
-
time
and
short
-
circuit
current
ratings
are
not
affect
-
ed
by
altitude
.
However
,
the
short
-
circuit
current
ratings
shall
not
exceed
that
of
the
voltage
class
before
derating
.
Standards
and
testing
Type
AKR
low
-
voltage
power
circuit
breakers
are
designed
and
tested
to
meet
ANSI
Standards
C
37.13
,
C
37.14
,
C
37.16
,
C
37.50
and
UL
1066
.
The
breakers
are
UL
-
listed
and
labeled
to
certi
-
fy
compliance
with
the
above
-
referenced
standards
.
Circuit
breaker
interrupting
capacity
may
require
derating
for
power
factor
lower
than
test
values
.
Power
factors
lower
than
test
values
affect
the
circuit
breaker
’
s
short
-
circuit
current
rating
.
The
test
circuit
X
/
R
ratio
and
power
factor
required
by
.
ANSI
C
37.13
is
6.6
and
15
%
for
unfused
breakers
and
4.9
and
20
%
for
fused
breakers
.
.
Table
15.3
Altitude
correction
factors
(
as
listed
in
ANSI
C
37.13
)
Altitude
Rating
correction
factor
Continuous
curent
Feet
Voltage
Meters
6600
(
and
below
)
1.00
1.00
2000
Table
15.1
Derating
factorfor
systems
with
powerfactors
lower
than
test
values
0.99
0.95
2600
8500
0.96
0.80
3900
13000
Multiple
factors
for
breaker
short
-
circuit
current
rating
System
X
/
R
ratio
System
short
-
circuit
power
factor
(
%
)
Humidity
and
fungus
Ferrous
parts
are
zinc
-
plated
for
corrosion
protection
except
for
some
parts
made
from
alloy
steels
that
are
inherently
cor
-
rosion
resistant
.
Current
-
carrying
parts
are
silver
-
or
tin
-
plated
for
corrosion
protection
and
to
assure
electrical
continuity
.
Fused
Unfused
1.000
4.90
1.000
20
0.938
6.60
1.000
15
0.902
12
8.27
0.966
0.875
9.95
0.938
10
0.847
11.72
0.920
8.5
0.826
14.25
0.902
7
Table
15.4
Insulation
values
(
Dielectric
test
)
0.794
20.00
0.875
5
kV
2.2
Temperature
derating
factors
The
continuous
current
rating
of
AKR
breakers
is
based
on
their
use
in
an
enclosure
at
40
°
C
ambient
temperature
and
105
°
C
maximum
breaker
temperature
for
Class
A
insulation
.
Continuous
current
ratings
of
.
AKR
breakers
must
be
derated
for
ambient
temperatures
above
40
°
C
.
(
If
MicroVersaTrip
pro
-
grammer
is
used
,
the
programmer
ambient
is
limited
to
70
°
C
.
)
Breaker
Control
Wiring
1.5
Closing
Motor
0.9
Table
15.5
Operating
time
(
Same
for
all
frame
sizes
)
Close
Time
from
energizing
closing
circuit
until
contacts
touch
Electrically
operated
5
Cycles
Open
With
instantaneous
overcurrent
trip
Table
15.2
Continuous
derating
factors
Ambient
temperature
(
°
C
)
3
Cycles
Maximum
clearing
time
Derating
factor
3.5
Cycles
With
shunt
trip
1.00
40
0.95
45
0.89
50
0.840
55
60
0.77
0.71
65
0.63
70
O
MicroVersaTrip
maximum
Time
current
tripping
characteristics
Table
15.6
Time
current
curves
.
AKR
low
-
voltage
power
circuit
breaker
time
current
curves
are
the
engineering
documents
that
define
technical
perfor
-
mance
characteristics
of
the
devices
.
Multiples
of
circuit
break
-
er
trip
rating
are
shown
on
the
top
and
bottom
horizontal
axis
,
with
time
in
seconds
on
the
vertical
axis
.
Approximate
mini
-
mum
and
maximum
clearing
time
is
readily
determined
through
the
characteristics
curves
.
Tripping
characteristics
meet
ANSI
,
NEMA
and
UL
standards
for
rating
and
calibration
.
Curve
Trip
elements
Trip
device
GES
-
9910
LSI
MicroVersaTrip
Plus
MicroVersaTrip
PM
G
GES
-
9911
Courtesy of NationalSwitchgear.com

Time
current
tripping
characteristics
i
30
40
SO
SO
70
SOM
§
.
5
6
7
I
9
1
2
4
5
6
7
8
9
10
20
1000
-
2
900
Hmd
Hi
-
Ring
*
li
50
/
60
Hz
Op
*
ration
Only
IBS
•
00
700
800
500
.
09
40
C
OB
«
/
>
.
07
Q
300
l
K
.
08
.
05
M
UJ
200
Application
Determines
End
of
Curve
.
04
Z
A
3
“
1
100
.
02
•
0
80
70
60
a
so
.
3
.
4
.
5
.
6
.
7
.
8
.
9
1
Multiples
of
Breaker
Short
-
time
Bating
(
HI
2
3
4
58789
10
40
U
30
S
Short
-
time
Rating
(
HI
(
Amps
,
rms
symmetrical
)
LU
1
-
Breaker
Type
240
Vac
480
Vac
AXR
-
3
CS
AKR
-
30
AKR
-
30
H
AKR
-
50
AXR
-
50
WAKRT
-
50
H
AKR
-
75
AKR
-
100
AKR
-
125
220
C
0
22000
22000
30000
30000 30000
42000
<
2000
<
2000
10
50000
50000
50000
55000
65000
55000
8
65000
65000
65000
7
85000
85000
85000
85000
»
000
85000
3
44
3
Instantaneous
Pickup
Settings
in
Multiples
of
Rating
Plug
Amps
(
X
)
Pickup
Settings
on
Trip
Units
Without
Short
-
time
Functioa
:
—
f
-
-
f
For
(
SI
=
150
thru
3200
amps
:
1.5
to
10.0
,
in
increments
of
05
For
(
S
)
—
4000
amps
'
15
to
9.0
.
in
increments
of
0.5
For
(
S
)
=
5000
amps
:
15
to
7.0
,
in
increments
of
0.5
Pickup
Settings
on
Trip
Units
With
Short
-
time
Function
:
For
(
SI
=
150
thru
2000
amps
:
1.5
to
15.0
,
m
increments
of
0.5
For
(
S
)
=
3200
amps
:
li
to
13.0
.
in
increments
of
0.5
For
IS
)
=
4000
amps
:
1
i
to
9.0
,
in
increments
of
Oi
For
|
S
)
=
5000
amps
:
1.5
to
7.0
,
in
increments
of
0.5
2
2
1
.
9
.
8
.
7
.
8
.
5
.
4
i
/
i
s
J
.
z
«
9
LU
I
u
UJ
.
1
.
1
.
09
A
9
z
.
08
UJ
-
A
7
I
08
V
.
05
.
05
Application
Determines
End
of
Curve
.
»
4
.
03
-
.
03
.
02
.
92
.
01
91
A
.
8
.
7
.
8
.
9
1
3
4
58789
1 0
3 0
4 0
5 0
8 0
70
9090
S
20
.
7
.
8
A
1
3
4
5
8
7
•
9
1 0
2
20
Multiples
of
Current
Setting
|
C
)
Multiples
of
Instantaneous
Pickup
Setting
GES
-
9910
GE
Electrical
Distribution
&
Control
Low
Voltage
Power
Circuit
Breakers
Type
AKR
with
Enhanced
MicroVersa
Trip
Plus
or
MicroVersa
Trip
PM
(
Series
RMS
-
9
C
)
Digital
RMS
Trip
Units
Adjustments
Long
-
time
function
:
•
Current
settings
(
C
)
:
0.50
to
1.0
in
005
increments
,
multiples
of
rating
plug
amps
(
X
)
Delay
Bands
:
1.2
.
3
and
4
Available
Ratings
(
Amperes
)
Brejktf
Current
Sensor
(
SI
Rating
Plug
1
»
Trpe
Model
Frame
Short
-
time
function
:
•
Pickup
settings
:
1.5
to
9.0
in
0.5
increments
,
multiples
of
current
setting
(
C
)
Delay
Bands
:
Min
.
Int
Max
;
1
^
t
In
.
l
^
t
Out
LVPC
8
AKR
»
30
Sfl
0
H
60
.
8
C
.
100.125
,
:
50
aoo
150
400
•
SO
.
200
225
.
250
.
30
C
.
400
BOO
300
.
tOQ
500
.
600
700
.
800
Long
-
time
Delay
.
Short
-
time
Delay
,
and
Instantaneous
Time
-
current
Curves
•
Curves
apply
at
50
to
400
Hertz
and
from
-
20
'
C
to
+
55
*
C
breaker
ambient
.
AKR
-
5
G
/
50
H
ax
300
.
4
CC
.
500
.
6
CC
.
700
8
CC
1600
Instantaneous
function
:
•
See
table
with
curve
above
1600
600.900
.
1
CCC
.
;
2
D
0
1600
AKRT
-
S
0
H
20
»
2000
600
.
I
OX
.
1200.1500
,
2000
Settings
Glossary
AkR
.
75
32
CC
1200.1600
.
2400
,
3200
32
»
S
«
Current
Sensor
Rating
m
amps
X
=
Rating
Plug
Rating
in
amps
C
=
Current
Setting
in
amps
AKR
-
iCC
1600
.
2000
2500
.
30
X
4000
4000
*
ccc
Note
:
Operation
above
60
Hern
requires
thermal
and
interrupting
derating
of
.
'
be
circuit
breaker
.
H
*
Breaker
Shon
-
time
3200.4003
.
5000
AKR
-
125
5000
5000
Ampere
Rating
Voltage
Rating
:
500
volts
ac
.
maximum
GE
Electrical
Distribution
&
Control
41
Woodford
Ave
.
Plainville
,
CT
06062
:
3
MZS
5
)
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500
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-
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Low
Voltage
Power
Circuit
Breakers
Type
AKR
Insulated
Case
Circuit
Breakers
Types
TP
.
THP
.
TC
,
THC
Molded
Case
Circuit
Breakers
R
-
Frame
with
Enhanced
MicroVersa
Trip
Plus
or
MicroVersa
Trip
PM
(
Series
RMS
-
9
C
)
Digital
RMS
Trip
Units
GE
Electrical
Distribution
&
Control
Adjustments
Available
Ratings
Amperes
)
Ground
Fault
function
:
•
Pickup
sellings
arc
in
multiples
of
Current
Sensor
Rating
!
S
)
For
IS
)
=
150
thru
2000
amps
Pickup
setting
0
20
to
0
60
m
001
increments
Far
(
SI
=
2500
thru
3200
amps
Pickup
setting
0
20
to
0.37
in
001
increments
For
(
SI
=
4000
amps
Pickup
setting
0.20
to
0.30
n
0.01
increments
For
(
S
|
=
EOOO
amps
Pickup
selling
0.20
to
0
2
«
in
0.01
increments
Delay
Bands
:
Mm
.
Int
.
Max
.
It
In
.
It
Out
Current
Sewer
(
S
|
Mo
4
el
Type
16
CC
;
ooo
.
i
6
oo
MCC
8
THbTRP
2000
2
BX
f
ICCB
2
C
0.40
P
.
ICC
TP
/
THP
/
TC
/
THC
800
16
»
1
C
00
,
150
C
20
»
2
CC
0
1
CC
0
.
23
»
.
2500
25
»
3
X
0
30
»
Ground
Fault
Time
-
Current
Curves
40
»
tore
LVPCB
AkR
-
aoS
-
TOH
8
»
150
.
4
M
.
K
>
:
•
Curves
apply
at
50
to
400
Hertz
and
from
-
20
'
C
to
+
55
’
C
breaker
ambient
.
Note
Operation
aoove
60
Hem
'
eagres
ibermm
ana
interrupting
aerating
o
!
rr
?
e
circuit
oreater
8
»
.
1600
SKR
-
SOtt
*
'
600
AKR
7
-
50
H
20
»
2
CO
0
Settings
Glossary
AKR
-
75
32
»
3200
AKR
-
100
«
COO
4
»
:
S
=
Currer
.
1
Sensor
Rating
in
amps
AKR
-
'
25
5000
50
»
Voltage
Rating
:
600
voks
ac
.
maximum
GE
Electrical
Distribution
&
Control
41
Woodford
Ave
.
Plainville
,
CT
06062
‘
3
M
.
2
/
95
I
17
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The
Load
Center
Principle
particular
power
system
.
For
instance
,
under
certain
circuit
arrangements
,
die
total
running
motor
short
-
circuit
current
contribution
may
be
greater
than
that
shown
in
die
motor
conuibution
tables
.
This
condition
might
exist
for
unit
substa
-
tions
having
a
high
ratio
of
running
motor
nameplate
horsepower
to
actual
demand
,
such
as
may
occur
in
heavy
machining
or
stamping
press
operations
.
This
condition
could
also
exist
when
a
secondary
selective
system
operates
with
one
main
breaker
open
and
one
main
and
one
tie
breaker
closed
so
that
the
feeder
breaker
can
see
“
twice
"
die
normal
motor
contribution
to
a
short
circuit
.
Pioneered
by
General
Electric
,
load
center
unit
substations
provide
reliable
equipment
for
power
distribution
in
industrial
plants
and
commercial
buildings
,
power
station
aux
-
iliaries
and
odier
applications
requiring
continuity
of
service
.
GE
offers
a
complete
line
of
load
center
unit
substations
for
indoor
or
outdoor
installations
.
The
unit
consists
of
an
incoming
line
,
a
transformer
and
low
-
voltage
sections
.
Load
center
unit
substations
are
handled
as
a
single
packaged
system
,
simplifying
engineering
coordination
and
application
.
For
these
types
of
systems
,
the
use
of
higher
-
rated
or
AKRU
fused
circuit
breakers
may
be
required
to
stay
within
die
short
-
circuit
rating
of
die
feeder
breaker
.
Standard
design
eliminates
unnecessary
'
purchasing
and
engineering
details
.
Factory
assembly
reduces
installation
time
and
cost
Power
circuit
breakers
are
available
with
various
combinations
of
long
-
time
delay
,
short
-
time
delay
and
instantaneous
trip
elements
.
Care
should
be
taken
to
specify
the
combination
of
trips
that
will
provide
die
balance
of
selectivity
and
protection
required
by
the
power
system
.
Mechanical
and
electrical
coordination
results
in
greater
reliability
.
Expert
field
engineering
is
available
to
ensure
proper
application
,
installation
and
operation
.
Howr
to
select
switchgear
The
application
tables
on
die
following
pages
provide
a
list
of
low
-
voltage
power
circuit
breakers
available
for
load
center
unit
substation
applications
.
The
air
power
circuit
breakers
are
coordinated
with
transformers
and
system
capacities
(
electrically
,
thermally
and
mechanically
)
.
For
analysis
procedures
on
motor
starting
and
DC
machine
circuit
applications
,
fused
breakers
,
overcurrent
trip
details
,
short
-
circuit
ratings
,
etc
.
,
refer
to
ANSI
C
37.13
and
ANSI
C
37.16
.
A
selectively
coordinated
substation
uses
main
and
tie
breakers
with
long
-
time
and
short
-
time
nip
characteristics
(
LS
)
to
delay
the
opening
of
die
main
circuit
breaker
until
the
faulted
feeder
has
had
an
opportunity
'
to
clear
.
This
provides
service
continuity
for
all
but
die
faulted
circuit
and
generally
allows
coordination
of
main
and
tie
breakers
with
the
various
trip
characteristics
(
LS
)
(
LSI
)
(
LI
)
available
on
feeder
circuit
breakers
.
Selectivity
^
can
be
carried
a
step
further
in
die
substation
by
specifying
selective
feeder
circuit
breakers
that
incorporate
long
-
time
,
short
-
time
and
high
-
range
instantaneous
(
LSH
)
to
allow
downstream
devices
to
clear
faults
within
dieir
area
.
1
These
tables
should
be
used
only
as
guidelines
,
taking
into
consideration
voltage
,
temperature
,
power
factor
,
altitude
and
other
service
conditions
diat
may
affect
application
on
a
Courtesy of NationalSwitchgear.com

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U
A
refinement
of
the
selective
feeder
incorporates
the
long
-
time
,
short
-
time
and
instantaneous
characteristics
to
provide
selectivity
without
sacrificing
instantaneous
fault
protection
at
high
short
-
circuit
currents
.
This
combination
of
trip
charac
-
teristics
permits
application
of
short
-
time
delay
trips
to
override
inrush
currents
to
down
stream
loads
and
coordinate
with
downstream
current
devices
for
lower
fault
current
values
.
It
also
permits
the
use
of
instantaneous
trips
to
provide
maximum
system
protection
for
high
values
of
fault
current
.
This
is
called
the
zone
-
selective
arrangement
and
is
often
desirable
when
the
load
-
center
feeder
serves
a
motor
control
center
or
other
large
load
.
substation
•
Transformer
impedance
listed
in
table
(
only
source
of
power
to
the
bus
is
the
substation
transformer
)
•
Total
connected
motor
kVA
does
not
exceed
50
%
of
transformer
rating
at
208
Y
/
120
volts
and
100
%
of
transformer
rating
at
240
,
480
,
and
600
volts
•
The
motor
contribution
is
taken
as
2.0
umes
the
rated
current
of
the
transformer
at
208
Y
/
120
volts
and
4.0
times
the
rated
current
at
240
,
480
and
600
volts
•
Tabulated
values
of
short
-
circuit
current
are
in
terms
of
RMS
symmetrical
current
per
NEMA
Standard
SG
-
3
•
Tables
estimate
short
circuit
duty
(
Reference
GET
-
3550
for
short
circuit
calculation
)
Long
-
time
and
instantaneous
trip
characteristics
(
LI
)
are
often
used
on
feeder
breakers
when
short
-
time
delay
is
not
required
to
coordinate
with
downstream
devices
.
Depending
on
the
magnitude
of
fault
current
and
die
circuit
impedance
between
breakers
,
a
feeder
breaker
with
LI
trips
may
also
be
able
to
coordinate
(
at
least
partially
)
with
a
similar
downstream
breaker
also
having
LI
trip
characteristics
.
Example
The
application
tables
make
it
easy
to
select
the
proper
General
Electric
breakers
for
use
with
distribution
systems
using
various
trip
devices
.
For
example
,
a
1500
kVA
transformer
,
with
750
MVA
maximum
primary
'
short
-
circuit
available
and
a
480
V
secondary
,
requires
at
least
an
AKRT
-
50
main
secondary
breaker
shown
in
column
7
of
the
480
V
appli
-
cation
table
.
Breakers
with
LI
trips
are
sometimes
referred
to
as
fully
rated
since
they
may
have
higher
interrupting
capabilities
when
provided
with
instantaneous
trips
(
LI
or
LSI
characteristics
)
.
The
majority
'
of
breakers
manufactured
today
,
however
,
have
the
same
interrupting
rating
regardless
of
the
trip
characteristic
.
Long
-
time
and
instantaneous
trips
(
LI
)
could
also
be
used
on
main
breakers
when
minimum
breaker
interrupting
time
is
required
for
the
rare
occurrence
of
a
fault
on
the
switchgear
main
bus
,
or
when
the
system
design
does
not
require
selective
coordination
.
Full
utilization
of
a
load
center
transformer
with
dual
temperature
rise
(
such
as
55
/
65
°
C
)
capability
or
forced
(
fan
)
cooling
capability
would
require
a
larger
frame
size
breaker
—
or
an
AKR
-
75
in
this
example
.
The
appropriate
feeder
circuit
breaker
is
found
in
columns
8
,
9
or
10
,
depending
on
the
combination
of
long
-
time
,
short
-
time
and
instantaneous
trips
required
by
the
system
design
.
In
this
example
,
the
same
type
breakers
(
AKR
-
30
H
)
are
required
regardless
of
the
type
of
trip
device
utilized
,
although
a
larger
frame
breaker
may
be
required
in
order
to
meet
the
continuous
load
requirement
of
a
particular
feeder
.
Application
tables
Application
tables
are
based
on
the
following
factors
:
•
A
three
-
phase
bolted
fault
at
the
low
-
voltage
terminals
of
die
Courtesy of NationalSwitchgear.com