Siemens SG-3118 Owner's manual

SIEMENS
Overcurrent
Trip
Devices
Instructions
Installation
Operation
Maintenance
SG
-
3118
Static
Trip
III
Courtesy of NationalSwitchgear.com

(
Safety
THIS
EQUIPMENT
CONTAINS
HAZARDOUS
VOLTAGES
.
SEVERE
PERSONAL
INJURY
OR
PROPERTY
DAMAGE CAN
RESULT
IF
SAFETY
INSTRUCTIONS
ARE
NOT FOLLOWED
.
ONLY
QUALIFIED
PERSONNEL
SHOULD
WORK ON
OR
AROUND
THIS
EQUIPMENT
AFTER
BECOMING
THOROUGHLY
FAMILIAR WITH
ALL
WARNINGS
,
SAFETY
NOTICES
,
AND
MAINTENANCE
PROCEDURES
CONTAIN
-
ED HEREIN
.
THE
SUCCESSFUL
AND
SAFE
OPERATION
OF
THIS
EQUIPMENT
IS
DEPENDENT
UPON PROPER
HANDL
-
ING
,
INSTALLATION
.
OPERATION
AND
MAINTENANCE
.
A
WARNING
h
Indicates
death
,
severe
personal
injury
or
substantial
property
damage
can
result
if
proper
precautions
are
not
taken
.
A
CAUTION
h
Indicates
minor
personal
injury
or
property
damage
can
result
if
proper
precautions
are
not
taken
.
Qualified
Person
For
the
purpose
of
this
manual and
on
product
labels
,
a
qualified
person
is
one
who is
familiar
with
the
installation
,
construction
and
operation
of
the
equipment
and
the
hazards
involved
.
In
addition
,
he has
the
following
qualifications
:
a
.
Is trained
and
authorized
to
energize
,
de
-
energize
,
clear
,
ground
and
tag
circuits and
equipment
in
accordance
with
established
safety
practices
.
b
.
Is trained
in
the
proper
care
and
use
of
protective
equip
-
ment
such
as
rubber
gloves
,
hard hat
,
safety
glasses
or
face
shields
,
flash
clothing
,
etc
.
,
in
accordance
with
established
safety
practices
.
A
DANGER
h
(
Indicates death
,
severe
personal
injury
or
substantial
property
damage
will
result
if
pro
-
per
precautions
are
not
taken
.
Field
Service
Operation
Signal
Words
Siemens
Energy
&
Automation
,
Inc
.
can
provide
competent
,
well
-
trained Field
Service
Representatives
to
provide
technical
guidance
and
advisory
assistance
for
the
installation
,
overhaul
,
repair
and
maintenance
of
Siemens
Energy
&
Automation
,
Inc
.
equipment
,
processes
and
systems
.
Contact
regional
service
centers
,
sales
offices
or
factory
for
details
.
Distinctive
signal
words
(
DANGER
,
WARNING
,
CAUTION
)
are
used
in
this instruction book
and
on
product
labels
to
indicate
degrees
of
hazard that
may
be encountered
by
the
user
.
These
signal
words
are
defined
below
.
Courtesy of NationalSwitchgear.com

able
of
Contents
(
Page
Page
13
TESTING
(
continued
)
Short
Time
Pickup
Test
Instantaneous
Trip
Test
Ground
Pickup
Test
Long
Time
Delay
Test
Thermal
Memory
Test
Short
Time
Delay
Test
Ground
Time
Delay
Test
Zone
Interlock
Test
Load
Indicator
Output
Test
Tripping
Actuator
Test
Current
Sensor
Test
Connections
Continuity
Checks
Excitation
Test
Sensor
Polarity
Primary
Current
Testing
MAINTENANCE
Removing
Static
Trip
III
from
Breaker
Repair
Cleaning
INTRODUCTION
General
Current
Sensors
Static
Trip
III
Device
OPERATIONS
Tripping
Actuator
Targets
Available
Types
Time
-
Current
Curves
Performance
In
Service
.
.
Settings
Time
Bands
General
Notes
Load
Indicator
Zone
Interlock
Coupler
.
.
.
Zone
Interlock
Expander
.
TESTING
General
Secondary
Current
Testing
Test
Connections
Long
Time
Pickup
Test
1
13
1
13
1
13
1
14
3
14
3
14
3
15
3
15
5
15
6
16
9
16
10
16
10
(
16
11
17
11
17
11
17
12
19
12
19
12
19
12
19
12
Note
The
instructions
contained
within
this
manual
are
necessary
for
the
safe
installation
,
maintenance
and
operation
of
this
equipment
.
If
this
manual
is
misplaced
or
lost
,
replacement
manuals
are
available
through
the
local
Siemens
Energy
&
Automation
,
Inc
.
sales
office
.
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
,
nor
to
provide
for
every
possible
contingency
,
to
be
met
in
connection
with
installation
,
operation
or
maintenance
.
Should
further
information
be
desired
or
should
particular
pro
-
blems
arise
which
are
not
covered
sufficiently
for
the
purchaser
'
s
purposes
,
the
matter
should
be
referred
to
the
local
Siemens
Energy
&
Automation
,
Inc
.
sales
office
.
THE
CONTENTS
OF
THIS
INSTRUCTIONAL
MANUAL
SHALL
NOT
BECOME
PART
OF
OR
MODIFY
ANY
PRIOR
OR
EXISTING
AGREEMENT
,
COMMITMENT
OR
RELATIONSHIP
.
THE
SALES
CONTRACT
CONTAINS
THE
ENTIRE
OBLIGATION
OR
SIEMENS
ENERGY
&
AUTOMATION
,
INC
.
THE
WARRANTY
CONTAINED
IN
THE
CONTRACT
BETWEEN
THE
PARTIES
IS
THE
SOLE
WARRANTY
OF
SIEMENS
ENERGY
&
AUTOMATION
,
INC
.
ANY
STATEMENTS
CONTAINED
HEREIN
DO
NOT
CREATE
NEW
WARRANTIES
OR
MODIFY
THE
EXISTING
WARRANTY
.
I
drawings
or
other
supplementary
instructions
for
specific
applications
are
forwarded
with
the
manual
or
separately
,
they
take
_
precedence
over
any
conflicting
or
imcomplete
information
in
this
manual
.
1
1987
^
Siemens
Energy
&
Automation
.
Inc
Courtesy of NationalSwitchgear.com

*
itroduction
Page
1
i
In
addition
to
the
basic
system
,
optional
devices
can
be
pro
-
vided
tor
additional
functions
.
These
include
:
The
information
contained
within
is
intended
to
assist
operating
personnel
by
providing
information
on
the
general
act
eristics
of
equipment
of
this
type
.
It
does
not
relieve
the
of
responsibility
to
use
sound
engineering
and
safety
prac
-
ihe
application
,
operation
and
maintenance
of
the
par
-
rfMf
1
.
A
Load
Indicator
mounted
on
the
front
cover
of
the
breaker
to
display
load
currents
and
provide
adjustable
load
alarm
contacts
.
IJCO
*
ii
iicuiar
equipment
purchased
.
it
drawings
or
other
supplementary
instructions
for
specific
ap
-
plications
are
forwarded
with
this
manual
or
separately
,
they
take
precedence
over
any
conflicting
or
incomplete
informa
-
tion
m
this
manual
.
ine
sales
contract
carries
all
the
information
on
warranty
coverage
.
2
Zone
Interlock
Coupler
and
Zone
Interlock
Expander
devices
to
connect
trip
devices
together
for
selective
short
time
and
ground
fault
interlocking
.
Current
Sensors
Toroidal
current
sensors
,
similar
to
standard
bushing
current
transformers
,
are
mounted
,
one
-
per
-
phase
on
the
primary
studs
of
the
circuit
breaker
.
They
are
special
purpose
current
transformers
that
have
the
accuracy
and
output
voltage
capabili
-
ty
needed
to
properly
operate
the
static
trip
device
.
These
pro
-
vide
a
signal
to
the
static
trip
device
proportional
to
the
primary
current
.
The
current
sensors
selected
for
a
specific
circuit
breaker
establish
the
maximum
continuous
current
rating
of
that
breaker
and
the
adjustment
range
.
Each
sensor
provides
a
choice
of
eleven
selectable
current
settings
.
General
Static
Trip
HI
is
the
name
of
Siemens
Energy
&
Automation
,
inc
microprocessor
based
static
overcurrent
trip
device
for
use
on
LA
and
RL
series
low
voltage
power
circuit
breakers
.
The
>
>
reakers
and
trip
device
are
listed
and
labeled
by
Underwriters
.
boratories
(
UL
)
.
With
the
exception
of
the
selector
switches
and
one
poten
-
tiometer
the
Static
Trip
ID
overcurrent
trip
devices
are
complete
-
ly
static
.
There
are
no
moving
parts
or
mechanical
contacts
.
Components
used
are
semiconductors
,
integrated
circuits
,
capacitors
,
transformers
,
etc
.
The
selector
switches
are
seal
-
ed
binary
coded
decimal
types
with
gold
plated
contacts
.
The
device
uses
an
eight
bit
single
chip
microprocessor
,
with
its
internal
ROM
(
Read
Only
Memory
)
programmed
to
be
a
trip
device
.
All
the
circuits
are
designed
for
conservative
loading
of
components
for
long
life
and
little
maintenance
.
The
rated
secondary
current
for
the
sensors
is
0.5
amperes
at
rated
primary
current
.
All
the
sensors
used
with
the
Static
Trip
III
device
are
encapsulated
in
polymeric
material
to
pro
-
tect
the
windings
and
prevent
their
motion
during
short
circuits
on
the
circuit
breaker
.
Static
Trip
III
Static
Tnp
Hi
overcurrent
trip
devices
operate
to
open
the
cir
-
cuit
breaker
when
the
circuit
current
exceeds
a
preselected
current
-
time
relationship
.
Depending
on
the
magnitude
of
the
overcurrent
and
the
selected
settings
,
tripping
may
be
instan
-
taneous
or
time
-
delayed
.
Energy
t
0
operate
the
tripping
system
is
obtained
solely
from
circuit
being
protected
.
Batteries
or
other
power
sources
im
not
needed
A
molded
polyester
enclosure
,
attached
to
the
breaker
,
houses
the
trip
device
and
its
electronic
circuits
(
Figure
1
)
.
The
static
tnp
device
receives
the
signal
from
the
current
sensors
.
It
monitors
the
signal
,
senses
overloads
and
faults
,
and
deter
-
mines
the
required
action
in
accordance
with
preselected
con
-
trol
settings
.
?
no
In
the
Static
Trip
III
device
the
current
signal
is
scaled
to
the
proper
value
internally
by
small
transformers
,
one
per
phase
,
rectified
and
converted
to
a
voltage
signal
by
a
resistor
.
This
voltage
signal
is
converted
to
a
digital
signal
by
an
analog
to
digital
converter
.
All
timing
and
logic
decisions
are
then
pro
-
cessed
mathematically
in
the
microprocessor
,
and
are
not
af
-
fected
by
variations
due
to
external
influences
,
such
as
changes
m
temperature
h
°
^
asic
static
overcurrent
trip
system
consists
of
three
parts
t
Primary
circuit
current
sensors
The
Static
Trip
III
device
t
A
in
.
xjnetically
held
circuit
breaker
latch
release
device
call
-
(
!
n
t
•
r
,
npmq
actuator
Courtesy of NationalSwitchgear.com

I
Courtesy of NationalSwitchgear.com

Operation
Page
3
Tripping
Actuator
The
tripping
actuator
for
use
with
the
Static
Trip
III
device
con
-
tains
an
additional
coil
which
,
when
energized by
an
additional
output
provided
by
the
trip
device
,
aids the
permanent
magnet
in
holding
the
actuator
closed
.
This coil
,
called
the
hold
-
in
coil
,
is
to
counteract
the
effects
of
the
external
magnetic
fields
pro
-
duced
by
short
circuit
currents
flowing
through
the
breaker
.
When the
static
trip
device
senses
a
circuit
condition
that
re
-
quires
the breaker
to
open
,
it
provides
an
output
to
the
actuator
(
Figure
2
)
which
causes
the
circuit breaker
contacts
to
open
and
isolate the
circuit
.
When the circuit
breaker
is
closed
,
the
tripping
actuator
is held
in
a
charged
position
by
a
permanent
magnet
.
It
contains
a
coil that
is
energized
by
the
output
of
the
static
trip
device
.
When
energized
this
coil
causes
the
magnetic
flux
to
shift
to
a
new
path
,
away
from
the
holding
pole
faces
.
This
releases
the stored
energy
of
a
spring
located inside
the
actuator
.
The
spring
pro
-
vides the
energy
to
trip
the
breaker
.
When
the
breaker
mechanism
opens
,
the
actuator
is
returned
to
the
charged
and
held
position
by
a
reset
mechanism
on
the
breaker
.
Targets
The
target
element consists
of
a
custom
LCD
(
Liquid
Crystal
Display
)
,
a
modest
amount
of
CMOS
logic
and
a
large
capacitor
(
1
Farad
)
to
store
the
power
to
operate
the
logic
and
LCD
for
an
extended
period
of
time
.
The
LCD
has
four
legends
that
become visible
when
the
target
is
operated
,
either
by
the
microprocessor
or
the
"
watchdog
”
circuit
.
The
four
legends
are
:
OVERLOAD
to
signal
long
time
tripping
,
SHORT
CIRCUIT
to
signal
either
short time
or
instantaneous
tripping
,
GROUND
FAULT
to
signal
when
the
device
trips
on
ground
current
,
and
DISABLED
to
signal
when
the
"
watchdog
”
circuit
determines
that the
microprossor
is
not
functioning
properly
.
Available
Types
Various
types
of
Static
Trip
III
devices
are
available
.
Similar
in
many
respects
,
they
differ
only
in
their
specific
application
.
All
accept
identical
current
sensor
input
and
provide
output
signals
to
the
tripping
actuator
,
and
to
the
optional
devices
.
The
type
designation
is
coded
to
indicate
the
functional
elements
and
is
preceeded
by
RMS
to
denote
the
standard
RMS
sensing
feature
.
The
type
coding
is
two
to
four
letters
as
shown
below
:
-
#
T
=
LONG
TIME
delay
element
.
S
=
SHORT
TIME
delay
element
.
I
=
INSTANTANEOUS
element
.
Figure
2
.
Tripping
Actuator
G
=
GROUND
FAULT
element
.
For
each
element
except
INSTANTANEOUS
,
there
are
two
ad
-
justable
selector
switches
,
accessible
through
the
front
cover
of
the
device
,
one
for
the
current
or
pickup
setting
and
one
for
the
time
delay
setting
.
The
INSTANTANEOUS
has
only
one
switch
for
pickup
setting
.
All
adjustments
can
be
made
in
the
field
.
Following
are
brief
descriptions
of
the
different
types
.
(
Courtesy of NationalSwitchgear.com

C
_
Operation
Page
4
Type
RMS
-
TI
A
dual
trip
device
used
for
phase
overcurrent
protection
with
instantaneous
trip
.
The
long
time
current
setting
range
is
selected
from
the
trip
rating
table and
is
switch
selectable
in
eleven
steps
from
0.5
to
1.0
times the
current
sensor
rating
.
The
pickup
value is
fixed
at
1.1
times
current
setting
.
The
LONG
TIME
delay
is selectable with
a
choice
of five
bands
.
The
long
time circuit
has
a
switch
-
selectable
"
Thermal
Memory
"
func
-
tion
for
motor
protection
.
The instantaneous element
is switch
selectable
in
six
steps
from
2
to
15
times the
current
sensor
rating
.
The instantaneous
pickup
setting
is
independent
of
the
long
time
current
setting
.
Type
RMS
-
TIG
-
T
A
dual
trip
device which
provides
phase
overcurrent
protec
-
tion
same
as
the
Type
RMS
-
TI
plus
ground
fault
protection
for
three wire
or
four
wire
circuits
on
systems
with either
phase
to
phase
or
phase
to
neutral
loading
.
Ground
pickup
settings
are
independent
of
the
phase
settings
and
are
selectable
in
5
steps
from
20
to
60
%
of
the
ground
sensor
rating
.
When
used
on
four
wire circuits
a
fourth
neutral
sensor
is
required
.
It is
mounted
in
the bus
compartment
and
is
wired
to
the
breaker
through
the
breaker
secondary
disconnects
.
Direct
ground
sensing
can
also be
used
,
with the
external neutral
sensor
mounted
on
the
ground
return
conductor
.
The
Ground
Fault
function
includes
an
I
*
t
ramp
in
the time
-
current
delay
characteristic
and
a
built
in
memory
for
arcing
ground
fault
protection
.
The device
contains
an
in
/
out
switch
for
long
time
"
Thermal
Memory
.
”
Type
RMS
-
TS
A
selective
trip
device used
for
phase
overcurrent
protection
which
provides
time
delay
tripping
only
.
It
allows
complete
field
adjustment
of
long
time
delay
and
current
setting
plus
the
short
time
delay
and
pickup
.
The
short
time
pickup
can
be
selected
in
8
steps
from
2
to
12
times
the
long
time
current
setting
.
Any
ie
of
the
five
short
time
delay
bands
can
be
chosen
to
be
^
jsed
with
any
of
the
five
long
time
delay
bands
.
The device
contains
in
/
out
switches
for
short
time
Pt
ramp
and
long
time
"
Thermal
Memory
.
"
Type
RMS
-
TSG
-
T
A
selective
trip
device
which
provides
phase
overcurrent
pro
-
tection
same
as
Type
RMS
-
TS
plus
ground
fault
protection
for
3
-
wire
or
4
-
wire
circuits
on
systems
with
either
phase
to
phase
or
phase
to
neutral
loading
.
Ground
current
pickup
settings
are
independent
of
the
phase
pickup
settings
and
are
adjustable
from
20
to
60
%
the
ground
sensor
rating
.
When used
on
4
-
wire
systems
a
fourth
neutral
sensor
is
required
.
It is mounted
in
the
bus
compartment
is
wired
to
the breaker
through
the
breaker
secondary
disconnects
.
The
ground
element
can
also
be
con
-
nected
for
direct
ground
sensing by
mounting
the
external
neutral
sensor
on
the
switchgear
ground
return
conductor
.
The
device
contains
an
in
/
out
switch
that
adds
an
Pt
ramp
to
the short
time
delay
bands
.
The device contains
an
in
/
out
switch
for
long
time
"
Thermal
Memory
.
"
Type
RMS
-
TSI
A
triple
selective
trip
device
used
for
phase
overcurrent
pro
-
tection
which
provides
long
time
delay
,
short
time
delay
and
instantenous
elements
.
It
allows
complete
adjustment
of
the
long
time
delay
band
and
current
setting
,
the short
time
delay
band
and
pickup
and the
instantaneous
pickup
.
The
short
time
pickup
can
be
adjusted
from
2
to
12
times the
long
time
current
setting
.
The
instantaneous
pickup
can
be ad
-
justed
from
2
to
15
times the
current
sensor
rating
.
The instan
-
taneous
pickup
current
is
not
changed by
a
change
in
the
long
time
current
setting
.
The short
time
pickup
varies
with
long
time
current
setting
.
Any
one
of
the short time
delay
bands
can
be
chosen
to
be used
with
any
one
of
the
long
time bands
.
The
device
contains
in
/
out
switches
for
short time
Pt
ramp
and
long
time
"
Thermal
Memory
.
"
Type
RMS
-
TSIG
-
T
A
triple
selective
trip
device
which
provides
phase
overcurrent
protection
same
as
Type
RMS
-
TSI
plus
ground
fault
protection
for
3
-
wire
or
4
-
wire
circuits
on
systems
with
either
phase
to
phase
or
phase
to
neutral
loading
.
Ground
current
pickup
is
independent
of
the
phase
current
settings
.
The
ground
pickup
settings
are
selectable
from
20
to
60
%
of
the
ground
sensor
rating
.
When
used
on
4
-
wire
circuits
a
fourth
neutral
sensor
is
required
.
It
is
mounted
in
the
bus
compartment
and
is
wired
to
the breaker
through
the
breaker
secondary
disconnects
.
Types
RMS
-
TI
-
T
,
RMS
-
TS
-
T
and
RMS
-
TSI
-
T
Targets
are
provided
by
adding
a
"
*
T
"
suffix
to
the basic
trip
device
catalog
number
.
The
same
basic
protective
functions
"
re
provided
as
described above
.
In
addition
,
a
separate
coprocessor
"
watchdog
”
circuit is included
to
monitor and
ndicate
malfunction
of
the
microprocessor
.
/
Courtesy of NationalSwitchgear.com

(
~
Operation
Page
5
Types
RMS
-
TS
-
TZ
,
RMS
-
TSI
-
TZ
,
RMS
-
TSIG
-
TZ
and
RMS
-
TSG
-
TZ
on
the
band
selected
.
In
other
words
,
the
delay
for
a
given
band
setting
varies
inversely
as
the
square
of
the
current
.
When
plot
-
ted
on
log
-
log
paper
this
relationship
is
a
straight
line
as
shown
by
the
sloping
bands
in
Figure
3
.
Five
discrete
long
time
delay
bands
are
available
in
every
device
,
any
one
of
which
may
be
selected
by
the
delay
band
control
switch
.
The
"
Z
”
suffix
at
the
end
of
the
trip
device
catalog
number
signifies
Zone
Interlocking
capability
for
short
time
and
/
or
ground
fault
functions
.
The
same
basic
protective
functions
are
provided
as
described
above
with
the
added
capability
of
con
-
necting
trip
devices
together
into
a
selectively
Zone
Interlock
-
ed
system
.
The
Zone
Interlock
circuit
has
an
in
/
out
switch
to
allow
these
trip
devices
to
act
as
standard
units
.
This
facilitates
testing
and
allows
interchange
with
trip
devices
which
are
not
Zone
Interlocked
.
The
long
time
element
has
a
"
Thermal
Memory
"
function
that
is
selected
by
a
switch
on
the
front
of
the
device
.
If
this
switch
is
"
in
.
"
the
delay
counter
of
the
long
time
circuit
will
not
reset
to
zero
when
the
current
falls
below
the
long
time
pickup
value
,
but
will
slowly
count
down
at
a
rate
determined
by
the
magnitude
of
the
remaining
current
.
When
there
is
an
intermit
-
tant
overload
that
does
not
reach
the
pickup
level
of
the
short
circuit
elements
,
the
intervals
of
overload
current
will
be
ac
-
cumulated
and
tripping
will
occur
when
the
accumulated
value
reaches
the
selected
trip
time
.
However
,
if
the
current
drops
to
nearly
zero
the
count
will
be
reset
and
the
timer
will
require
the
full
delay
before
tripping
will
occur
.
NOTE
1
.
Devices
that
provide
ground
fault
protection
are
not
available
without
targets
.
2
.
Optional
Selective
Zone
Interlocking
circuits
are
"
hard
wired
"
between
trip
devices
.
When
this
op
-
tion
is
specified
the
trip
device
is
provided
with
a
cord
to
connect
to
a
cubicle
-
mounted
connector
.
The
trip
device
provides
an
output
signal
whenever
either
the
ground
or
short
time
element
picks
up
.
This
output
signal
is
connected
from
the
downstream
breaker
to
the
input
terminals
of
the
upstream
breaker
.
3
.
With
no
signal
applied
to
the
Zone
Interlocking
in
-
put
and
the
Zone
Interlock
switch
"
in
.
"
both
the
ground
and
the
short
time
elements
will
operate
on
their
shortest
time
delay
bands
,
regardless
of
the
band
selected
.
When
the
signal
is
applied
both
the
ground
and
the
short
time
elements
will
operate
on
their
selected
delay
bands
.
If
the
"
Thermal
Memory
"
switch
is
"
out
,
"
the
long
time
element
will
reset
each
time
the
current
falls
below
the
long
time
pickup
value
.
The
minimum
delays
for
each
band
,
at
six
times
the
current
setting
are
3.5
,
6.0
,
10
,
17
and
30
seconds
,
and
are
shown
at
the
delay
adjustment
switch
.
The
short
-
time
element
has
a
definite
delay
which
is
indepen
-
dent
of
current
as
shown
by
the
horizontal
curves
in
Figure
3
.
There
are
5
calibrated
bands
.
These
have
nominal
delays
of
0.08
,
.
15
,
.
22
,
.
30
and
.
40
seconds
.
The
short
time
element
has
an
I
*
t
ramp
as
shown
in
Figure
3
.
This
function
is
selected
in
or
out
by
a
small
switch
on
the
front
of
the
device
labeled
"
Short
Time
Pt
.
"
This
feature
provides
improved
coordination
with
downstream
devices
such
as
time
delay
fuses
,
or
molded
case
circuit
breakers
.
The
ground
fault
time
delay
element
has
a
definite
delay
similar
to
the
short
time
element
.
There
are
three
calibrated
bands
hav
-
ing
delays
of
0.1
second
,
0.25
second
and
0.4
second
.
The
ground
fault
element
also
includes
an
I
2
t
ramp
as
shown
in
Figure
3
.
Time
-
Current
Curves
Figure
3
is
a
set
of
time
-
current
curves
for
the
Static
Trip
III
devices
.
The
tong
time
element
has
a
characteristic
represented
by
:
T
=
KI
-
2
or
=
K
/
I
2
where
T
=
time
delay
.
I
=
current
expressed
in
multiples
of
the
long
time
current
setting
,
and
K
is
a
constant
depending
(
Courtesy of NationalSwitchgear.com

operation
Page
6
0
formal
coating
to
exclude
moisture
and
many
corrosive
at
-
mospheres
.
However
,
the
factory
should
be
consulted
when
the
application
involves
a
particularly
severe
environment
.
Both
the
short
time
and
the
ground
fault
elements
can
be
sup
-
plied
to
be
used
with
the
Zone
Interlock
option
.
The
Z
1
option
allows
the
trip
devices
to
be
wired
together
to
provide
faster
tripping
for
faults
between
breakers
.
When
Zone
Interlocking
is
specified
,
the
trip
device
will
operate
on
the
minimum
time
delay
curves
for
both
short
time
and
ground
fault
in
the
absence
of
an
incoming
Zl
signal
.
When
the
trip
device
is
supplied
with
an
incoming
Zl
signal
,
both
curves
will
shift
to
the
bands
selected
by
their
respective
delay
band
settings
.
The
temperature
at
the
static
trip
device
does
have
some
ef
-
fect
on
the
characteristics
and
on
the
overall
reliability
of
the
system
.
The
change
in
characteristics
is
small
since
most
of
the
operations
are
carried
out
as
mathematical
manipulations
within
the
microprocessor
,
so
changes
should
not
be
a
factor
in
most
applications
.
Over
the
range
of
-
40
°
C
to
+
55
°
C
(
-
40
°
F
to
131
°
F
)
,
the
variations
from
performance
at
room
temperature
is
very
small
,
amounting
to
less
than
5
%
on
pickup
or
time
delay
values
.
Operation
is
not
recommended
beyond
this
range
.
If
necessary
,
control
of
the
temperature
should
be
provided
by
heaters
or
ventilation
.
Operation
at
increased
am
-
bient
temperature
seriously
affects
the
reliability
of
all
electronic
devices
.
Trip
devices
with
the
Zone
Interlocking
option
have
an
"
in
/
ouf
switch
to
allow
them
to
function
as
a
standard
trip
unit
when
not
wired
into
a
Zl
system
.
Instantaneous
trip
has
no
intentional
time
delay
,
other
than
that
provided
by
the
power
supply
and
for
filtering
purposes
.
The
Instantaneous
curves
show
the
breaker
rated
clearing
time
for
a
three
phase
fault
.
For
closing
in
on
a
single
phase
fault
the
total
clearing
time
may
be
extended
by
as
much
as
.
02
seconds
.
Connection
Diagrams
Figure
4
through
6
show
in
schematic
form
the
pre
-
wired
connections
from
the
breaker
-
mounted
cur
-
rent
sensors
to
the
Static
Trip
III
device
.
This
wiring
varies
with
the
application
.
The
three
most
commonly
used
schemes
are
shown
,
and
the
diagrams
with
their
captions
are
self
-
explanatory
.
he
width
of
the
time
bands
in
Figure
3
is
due
principally
to
(
.
Terences
between
devices
caused
by
normal
tolerance
of
commercial
components
in
the
circuits
.
Repeated
tests
on
any
one
unit
will
fall
in
a
much
narrower
band
.
The
band
width
also
includes
the
breaker
interrupting
time
.
The
upper
limit
represents
the
maximum
total
clearing
time
including
breaker
opening
and
arcing
time
,
whereas
the
lower
limit
is
the
"
resettable
time
”
—
the
maximum
time
that
the
overload
can
persist
without
tripping
the
circuit
breaker
.
NOTE
For
4
-
wire
systems
with
ground
fault
tripping
the
neutral
sensor
is
connected
to
the
neutral
or
ground
return
conductor
in
the
bus
compartment
,
and
is
con
-
nected
to
the
Static
Trip
III
trip
device
through
secon
-
dary
drawout
contacts
on
the
breaker
.
Note
that
the
Instantaneous
curves
show
no
"
resettable
time
,
"
indicating
that
multiple
breakers
with
instantaneous
trip
devices
cannot
be
selectively
coordinated
for
short
circuits
except
by
pickup
settings
.
Performance
In
Service
Ambient
conditions
and
length
of
service
have
little
effect
on
the
performance
of
the
Static
Trip
III
trip
device
.
The
circuits
are
stable
and
will
show
excellent
repeatability
over
long
periods
of
time
.
Service
involving
frequent
operations
will
not
cause
the
characteristics
to
change
or
drift
,
since
there
are
no
moving
mechanical
parts
to
wear
or
bearings
to
lubricate
.
Static
Trip
III
devices
are
tolerant
of
dusty
conditions
and
will
function
properly
in
many
areas
that
would
affect
the
perfor
-
mance
of
electro
-
mechanical
trip
devices
.
The
circuit
boards
id
components
inside
the
trip
device
are
coated
with
a
con
-
(
Courtesy of NationalSwitchgear.com

(
aeration
Page
7
GROUND CURRENT
IN
PERCENT
OF GRD
,
SENSOR
RATING
40
60
80
100
CURRENT
IN
MULTIPLES
OF
LONG
TIME
SETTING
4
6
8
10
20
40
60
Mloo
10 20
\
800
800
600
600
-
LONG
TIME
CURVES
CD
V
\
400
400
LONG
TIME
CURRENT
SETTING
IS SVITCH
SELECTABLE
FROM
0.5
TO
1.0
TIMES SENSOR
RATING
VITH
CALIBRATED
POINTS
PER
DEVICE
FACEPLATE
\
200
200
%
GROUND
FAULT
PICKUP
ADJUSTMENT
20
,
30
,
40
,
50
&
60
'
/
.
OF GRD
.
SENSOR
RATING
100
100
80
80
\
5
s
X
5
cr
>
r
\
v
60
60
5
x
5
\
TIME DELAY
REFERENCE
POINTS
PER
DEVICE
FACEPLATE
X
40
i
\
20
\
\
IW
\
\
x
(
10
1
8
8
\
SHORT
TIME
PICKUP
ADJUSTMENT
RANGE
2.3
,
4
,
5.6
,
7
,
8
t
12
TIMES
LONG
TIME
CURRENT
SETTING
\
,
(
A
(
A
6
X
£
6
\
z
z
a
NA
\
\
5
\
a
4
4
u
<
J
Nil
UJ
LJ
(
A
(
A
N
v
SHORT
TIME
I
2
t
SVITCH
z
z
\
To
IN
2
2
yy yy y
LJ
UJ
OUT
\
\
z
z
\
\
X
\
GROUND
CURVES
(
G
)
VV
\
SHORT
TIME
-
CURVES
<
S
3
l
.
8
.
8
v
IV
\
y
V
x z
.
6
1
X
1
.
6
Z
5
X
X
>
\
V
)
U
\
lAO
\
.
4
.
4
m
x
v
h
\
V
{
s
\
\
22
V
\
.
2
.
2
A
\
\
\
I
x
r
r
-
.
10
.
1
\
.
08
.
08
.
06
k
y
.
06
p
7
INSTANTANEOUS
PICKUP
-
v
ADJUSTMENT
RANGE
2
,
4
,
6.0
,
12
t
15
TIMES
SENSOR
RATING
•
^
MAXIMUM
INTERRUPTING
TIME
.
04
.
04
.
02
.
02
.
01
.
0
{
10
20
40
60
80100
40
60 80
100
20
4
6 8
10
GROUND
CURRENT
IN
PERCENT
F
GRD
.
SENSOR
RATING
CURRENT
IN
MULTIPLES
OF
LONG
TIME
SETTING
Figure
3
.
Static
Trip
III
Trip
Device
Time
-
Current
Curves
Courtesy of NationalSwitchgear.com