GE IAC53A User manual

INSTRUCTIONS
GEH
-
1788
L
TIME
OVERCURRENT
RELAYS
TYPES
IAC
53
A
IAC
53
B
IAC
53
C
IAC
53
R
IAC
54
A
IAC
54
B
GENERAL
^
ELECTRIC
Courtesy of store.ips.us

GEH
-
1788
Tvne
IAC
Time
Overcurrent
Relay
TOP
PIVOT
TAP
PLUG
SEAL
-
IN
UNIT
HOLDING
COIL
SEAL
-
IN
TARGET
SEAL
-
IN
—
-
UNIT
STATIONARY
CONTACT
,
LEFT
SEAL
-
IN
UNIT
STATIONARY
CONTACT
,
RIGHT
TAP
BLOCK
—
TIME
DIAL
DISK
SHAFT
MAIN
MOVING
CONTACT
MAIN
STATIONARY
BRUSH
AND
CONTACT
ASSEMBLY
1
r
MAGNET
DISK
SEAL
-
IN
MOVING
CONTACT
ASSEMBLY
Lf
>
£
3
04
04
O
00
Ol
Li
_
Fig
.
I
The
Induction
Unit
for
Type
IAC
Relays
(
Front
View
)
00
04
in
04
04
-
CRADLE
o
oo
04
cn
u
_
DISK
AND
SHAFT
COIL
AND
TAP
BLOCK
ASSEMBLY
ID
ao
04
LT
)
CO
o
oo
k
.
<
D
>
O
LOWER
JEWEL
SCREW
.
.
/
o
Fig
.
2
The
Induction
Unit
for
Type
IAC
Relays
(
Rear
View
)
2
Courtesy of store.ips.us

TIME
OVERCURRENT
RELAYS
TYPE
IAC
INTRODUCTION
Contact
Circuits
Instan
.
A
-
C
Trip
Indue
.
Outline
&
P
.
D
.
Int
.
Conn
.
Type
Unit
Unit
Unit
IAC
53
A
(
“
)
A
IAC
53
B
(
-
)
A
LAC
53
C
(
-
)
A
iAC
53
R
(
-
)
A
IAC
54
A
(
-
)
A
IAC
54
B
(
-
)
A
One
One
One
One
Two
Two
No
Fig
.
12
Fig
.
13
Fig
.
14
Fig
.
15
Fig
.
16
Fig
.
17
No
One
One
On
3
One
One
One
Fig
.
20
Fig
.
20
Fie
.
20
Fig
.
20
Fig
.
20
Fig
.
20
Yes
No
No
Yes
Yes
Yes
No
No
Yes
No
The
Types
IAC
53
and
IAC
54
relays
are
time
overcurrent
relays
with
a
very
-
inverse
time
char
-
acteristic
.
overcurrent
on
single
-
phaseandpoly
-
phasecircuits
.
The
various
relays
described
in
this
instruction
book
differ
in
the
number
of
circuits
they
close
,
and
if
an
instantaneous
unit
and
/
or
an
a
-
c
tripping
unit
is
included
.
mits
instantaneous
tripping
for
exteremely
high
cur
-
rents
,
or
an
induction
unit
with
an
a
-
c
tripping
unit
for
use
where
d
-
c
power
is
unavailable
or
a
-
c
tripping
is
preferred
.
Since
practically
all
Type
IAC
relays
are
composed
of
various
combinations
of
the
above
(
that
is
,
the
induction
unit
,
the
instantaneous
unit
and
the
a
-
c
tripping
unit
)
,
they
are
,
for
convenience
,
describ
-
ed
separately
in
the
following
text
.
The
above
table
indicates
the
units
comprising
each
type
and
also
lists
the
internal
connections
and
outline
and
panel
drilling
diagrams
.
They
are
employed
to
protect
against
These
relays
consist
of
an
induction
unit
or
an
induction
unit
with
an
instantaneous
unit
which
per
-
INDUCTION
UNIT
APPLICATION
INTRODUCTION
The
induction
unit
is
the
main
unit
in
all
Type
IAC
relays
,
supplying
the
very
inverse
time
delay
characteristics
of
the
relay
and
sounding
an
alarm
or
tripping
the
breakers
for
overload
currents
which
cause
it
to
close
its
contacts
.
The
induction
unit
is
the
basic
unit
in
all
Type
IAC
relays
.
Figs
.
1
and
2
show
the
induction
unit
mounted
in
the
cradle
.
These
units
are
of
the
induc
-
tion
-
disk
construction
type
.
The
disk
is
actuated
by
a
current
operating
coil
on
a
laminated
U
-
magnet
.
The
disk
shaft
carries
the
moving
contact
which
completes
the
alarm
or
trip
circuit
when
it
touches
the
station
-
ary
contact
or
contacts
.
The
disk
shaft
is
restrained
by
a
spiral
spring
to
give
the
proper
contact
-
closing
current
and
its
motion
is
retarded
by
a
permanent
magnet
acting
on
the
disk
to
give
the
correct
time
delay
.
OPERATING
CHARACTERISTICS
The
induction
unit
may
have
one
or
two
circuit
-
closing
contacts
which
close
as
the
current
increases
to
the
pick
-
up
value
as
set
on
the
tap
block
.
The
time
delay
in
closing
the
contacts
is
determined
by
the
setting
of
the
time
dial
(
Fig
.
1
)
.
The
time
-
cur
-
rent
characteristics
are
shown
in
Fig
.
3
.
There
is
a
seal
-
in
unit
mounted
on
the
front
to
the
left
of
the
shaft
.
This
unit
has
its
coil
in
series
and
its
contacts
in
parallel
with
the
main
contacts
such
that
when
the
main
contacts
-
close
the
seal
-
in
unit
picks
up
and
seals
in
.
When
the
seal
-
in
unit
picks
up
,
it
raises
a
target
into
view
which
latches
up
and
remains
exposed
until
released
by
pressing
a
button
beneath
the
lower
left
corner
of
the
cover
.
RATINGS
The
induction
unit
is
designed
to
use
any
one
of
four
operating
coils
,
each
having
a
different
com
-
bination
of
taps
as
follows
,
4
,
5
,
6
,
7
,
8
,
10
,
12
,
and
16
amperes
;
1.5
,
2.0
,
2.5
,
3.0
,
4.0
,
5.0
and
6.0
amperes
;
0.5
,
0.6
,
0.8
,
1.0
,
1.2
,
1.5
and
2.0
amperes
;
0.1
,
0.12
,
0.16
,
0.2
,
0.24
,
0.3
and
0.4
amperes
.
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
,
further
information
be
desired
Should
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser
'
s
purposes
,
the
matter
should
be
referred
to
the
General
Electric
Company
.
To
the
extent
required
the
products
described
herein
meet
applicable
ANSI
,
IEEE
and
NEMA
standards
;
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
3
Courtesy of store.ips.us

GEH
-
1788
Type
IAC
Time
Overcurrent
Relay
ii
i
i
mil
I
SI
!
!
!
!!
*
I
i
•
*
»
*
8
^
S
.
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7
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»
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0
1
I
4
B
I
7
I
lit
St
44
II
M
78
N
MS
1044
16
M
Mi
•
00
M
4
MO
704
Mfl
EXTENDED
P
/
NGE
(
8
C
0
EERlEC
)
tit
•
04
ADJUSTMENTS
441
4
M
RATINGS
INST
.
UNIT
TIME
UNIT
TAPS
I
N
ST
UNIT
TIME
UNIT
tft
Mi
CONTINUOUSLY
ADJUSTABLE
G
•
5
,
0
6
,
0
-
7
^
0
8
,
1
-
0
;
1
*
2
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5
,
2
0
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,
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-
5
^
3
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j
2
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6
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7
-
Oj
8.0
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10
,
12
2
-
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-
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,
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.
O
3
4
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OjS
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-
Oj
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,
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6
0.5
-
4
-
0
2
-
16
10
-
80
20
-
160
Q
.
5
-
4.0
I
.
5
-
12.0
stt
100
2
-
16
104
m
*
mm
100
•
4
M
W
M
74
70
M
M
M
90
M
20
10
IB
A
A
1
7
\
VUu
\
\
MV
A
•
d
I
•
v
.
s
\
O
4
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YC
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8
.
2
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.
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s
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s
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x
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s
V
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W
•
s
\
V
\
N
10
v
t
1
\
V
9
.
0
\
.
0
8
\
V
,
N
7
s
in
-
.
4
\
\
6
9
\
B
C
s
x
x
5
v
.
4
4
\
N
V
®
s
CO
.
s
3
s
\
V
o
X
\
2
o
.
2
\
S
N
®
\
E
x
-
N
.
H
.
1
.
1
.
04
.
0
«
k
M
.
07
JS
M
jn
n
JS
JI
I
I
iMillf
J
*
J
.
4
.
7
.
0
J
1
a
4
1
min
St
44
44
44
70
BOM
|
I
III
I
Kill
MULTIPLES
OF
RELAY
TAP
SETTING
M
Figure
3
(
0888
B
0270
[
3
]
)
Time
-
Current
Curves
for
Type
IAC
Relays
with
Very
-
Inverse
-
Time
Characteristics
4
Courtesy of store.ips.us

Type
LA
.
C
Time
Overcurrent
Relay
GEH
-
1788
CM
LO
CALIBRATION
PLATE
ADJUSTABLE
POLE
PIECE
CM
I
3
a
ao
CONTACTS
INSTANTANEOUS
W
UNIT
OPERATING
COIL
-
TARGET
STATIONARY
CONTACTS
MOVING
CONTACT
ASSEMBLY
SHORTING
.
COIL
u
.
MAIN
COIL
A
-
C
TRIPPING
”
UNIT
to
CM
to
CM
CM
o
oo
to
Ol
li
.
Type
I
AC
Relay
with
an
Instantaneous
Unit
(
Front
View
)
Fi
g
.
Fig
.
4
BURDENS
The
current
-
closing
rating
of
the
contacts
is
30
amperes
for
voltages
not
exceeding
250
volts
.
The
current
-
carrying
ratings
are
affected
by
the
selection
of
the
tap
on
the
target
and
seal
-
in
coil
as
indicated
in
the
following
table
:
Burdens
for
the
standard
coils
are
given
in
the
following
table
.
These
are
calculated
burdens
at
five
amperes
based
on
burden
of
minimum
tap
.
Volt
-
ampere
burdens
for
the
lowest
tap
on
any
of
the
three
coils
can
be
determined
for
any
value
of
current
,
up
to
20
times
tap
setting
,
from
Fig
.
6
.
Amperes
,
a
-
c
or
d
-
c
Volt
Imp
.
Ohms
Coil
PF
Function
Amps
Freq
.
Tap
Amps
Amps
2
-
Amp
Tap
0.2
Amp
Tap
5
Tripping
Duty
Carry
Continuously
Operating
Range
Resistance
Impedance
at
60
cy
30
0.08
0.50
5
60
4
2.0
4
-
16
0.3
3
0.07
5
0.50
50
1.7
4
0.2
-
2
2
-
30
0.05
0.61
5
1.3
25
4
7
0.13
0.58
0.42
1.5
-
6
60
1.5
5
14.5
52
0.53
0.48
0.42
50
1.5
5
12.0
0.36
0.55
25
1.5
5
9.0
4.20
0.5
*
2
0.35
0.5
60
5
105.0
3.45
0.34
0.5
50
5
86.0
If
the
tripping
current
exceeds
30
amperes
an
auxiliary
relay
should
be
used
,
the
connections
being
such
that
the
tripping
current
does
not
pass
through
the
contacts
or
the
target
and
seal
-
in
coils
of
the
protective
relay
.
3.28
0.55
0.5
5
25
82.0
*
0.38
122
3050
2546
5
0.1
60
0.1
-
0.4
0.36
102
5
0.1
50
INSTANTANEOUS
UNIT
INTRODUCTION
The
instantaneous
unit
is
a
small
instantaneous
hinge
-
type
unit
which
may
be
mounted
on
the
right
front
side
of
the
induction
unit
(
See
Fig
.
4
)
.
Its
contacts
are
normally
connected
in
parallel
with
the
contacts
of
the
main
unit
.
Its
coil
is
connected
in
series
with
the
operating
coil
of
the
main
unit
.
When
the
current
reaches
a
predetermined
value
,
the
instantaneous
unit
operates
,
closing
the
contact
circuit
and
raising
its
target
into
view
.
The
target
latches
in
the
exposed
position
until
released
by
pressing
the
button
beneath
the
lower
left
-
hand
corner
of
the
relay
cover
.
5
Courtesy of store.ips.us

GEH
-
1788
Type
IAC
Time
Overcurrent
Relay
26
24
22
TAP
RANGE
0.5
-
2.0
AMPS
.
20
16
DQ
'
V
16
25
/
-
U
V
14
0
L
T
12
CM
o
TAP
60
AJ
o
O
RANGE
1.5
-
6.0
AMPS
.
-
5
0
'
v
*
<
o
25
^
TAP
cr
>
60
^
NJ
'
.
RANGE
4
-
16
AMPS
.
ii
.
50
oj
2
5
MULTIPLES
OF
MINIMUM
PlCK
-
UP
CURRENT
SATURATION
CURVES
FOR
LOWEST
TAPS
OF
INDUCTION
UNITS
ON
VERY
INVERSE
TYPE
IAC
RELAYS
Saturation
Curves
for
Lowest
Taps
of
tne
Induction
Unit
of
Type
IAC
Relays
with
Very
-
Inverse
-
Time
Characteristics
6
Courtesy of store.ips.us

Type
1
AC
Time
Overcurrent
Relay
(
JEH
-
1788
0.030
1
T
OPERATING
TIME
RANGE
FOR
ANY
PICKUP
SETTING
T
0.025
o
Ul
0.020
1
UJ
*
-
0.015
a
.
e
0.010
a
.
0.005
0
0
2
3
4
5
6
7
8
9
10
MULTIPLES
OF
PICK
-
UP
Fig
.
7
A
(
K
-
6306872
[
3
]
)
Time
-
Current
Characteristics
for
Original
Instantaneous
Unit
111
SEISMIC
RATED
INSTANTANEOUS
UNIT
OPERATING
TIME
T
1
t
.
025
T
T
1
,
1
1
—
1
1
t
•
.
020
1
a
L
v
-
i
8
1
.
©
l
&
\
2
1
OPERATING
TIME
RANGE
FOR
ANY
PICKUP
SETTING
a
.
§
.
010
a
.
\
.
005
9
10
4
3
1.5
2
MULTIPLES
OF
PICKUP
Fig
.
7
B
(
0208
A
869
5
-
1
)
Time
-
Current
Characteristics
for
the
,
?
Hi
-
G
”
Unit
7
Courtesy of store.ips.us

GEH
-
1788
Type
IAC
Time
Overcurrent
Relay
APPLICATION
RATINGS
The
instantaneous
unit
is
used
on
certain
Type
IAC
relay
models
to
provide
instantaneous
tripping
for
current
exceeding
a
predetermined
value
.
The
instantaneous
unit
is
designed
to
use
the
coils
listed
below
;
Coil
Amp
Volt
-
Amp
Freq
Imp
.
Ohms
P
.
F
.
5
0.5
-
2
60
360
14.4
0.74
OPERATING
CHARACTERISTICS
5
3.6
1
-
4
60
0.77
90
5
2
-
8
60
22.5
0.83
0.90
5
25
0.32
0.83
8.0
5
5.63
4
-
16
60
0.225
0.191
0.157
0.095
0.87
*
The
instantaneous
unit
operates
over
a
four
-
calibration
stamped
on
5
4.77
0.87
50
and
has
its
to
-
one
range
a
scale
mounted
beside
the
adjustable
pole
piece
.
Time
-
current
5
40
3.93
0.88
5
2.37
25
0.88
characteristics
are
shown
in
Fig
.
7
A
for
the
instantaneous
unit
used
before
1977
.
5
7
-
28
60
1.68
0.067
0.88
In
1977
make
it
have
a
higher
seismic
rating
,
instantaneous
unit
can
be
identified
by
the
mark
-
ing
"
Hi
-
G
"
moulded
into
the
front
moulding
just
above
the
target
windows
,
characteristic
for
the
"
Hi
-
G
"
Fig
.
7
B
.
the
instantaneous
unit
was
modified
to
The
new
5
60
0.83
0.033
0.032
0.027
10
-
40
0.95
5
0.80
50
0.95
5
25
0.68
0.98
time
-
current
The
unit
is
shown
in
5
20
-
80
60
0.20
0.008
0.008
0.007
0.95
5
0.20
50
0.95
LJ
.
25
0.18
0.98
A
-
C
TRIPPING
UNIT
circulates
through
the
induction
unit
cur
rent
coil
and
the
main
coil
of
the
Type
REA
auxiliary
tripping
unit
,
returning
through
the
Type
REA
contacts
to
the
cur
-
rent
transformer
.
Normally
,
most
of
the
flux
gener
-
ated
by
the
main
Type
REA
coil
passes
through
the
upper
limb
of
the
magnetic
structure
and
holds
the
armature
firmly
against
this
limb
.
When
the
contacts
of
the
induction
unit
close
,
the
shorting
coil
of
the
Type
REA
unit
is
short
-
circuited
and
current
flows
in
this
coil
by
transformer
action
,
causing
a
redis
-
tribution
of
flux
which
actuates
the
armature
and
the
Type
REA
contacts
.
The
opening
of
the
Type
REA
contacts
causes
the
secondary
current
to
flow
through
the
trip
coil
which
trips
the
breaker
.
INTRODUCTION
The
a
-
c
tripping
unit
is
a
Type
REA
relay
unit
designed
to
energize
a
circuit
-
breaker
trip
coil
from
its
associated
current
transformer
upon
the
operation
of
the
main
unit
of
the
Type
IAC
relay
.
It
transfers
the
current
from
the
secondary
of
the
current
transformer
into
the
trip
coil
and
removes
the
current
from
the
trip
coil
when
the
breaker
trips
.
The
tripping
unit
is
mounted
on
the
rear
of
the
frame
opposite
the
tapped
operating
coil
of
the
in
-
duction
unit
(
see
Fig
.
5
)
.
The
operation
of
this
unit
is
illustrated
in
Fig
.
11
.
The
secondary
current
8
*
Indicates
revision
Courtesy of store.ips.us

Type
IAC
Time
Overcurrent
Relay
GEH
-
1788
A
—
C BuS
.
TRIP
B L
$
1
2
n
51
N
Device Function Numbers
for
Use
with
ALL
External
Diagrams
Instantaneous
Unit
Overcurrent
Relay
,
Type
IAC
Ground
Overcurrent
Relay
,
Type
IAC
Power
Circuit
Breaker
Seal
-
in
Unit
,
with
Target
Trip
Coil
Auxiliary
Contact
,
closed
when
breaker closes
3
SI
51
-
51
-
1
Ji
rr
SIN
T
i
i
50
J
l
J
51
2
52
51
N
Ilk
r
TC
52
SI
TC
A
l
5
j
51
-
3
51
-
1
0
'
"
.
*
1
H l
"
5
,
_
JLT
Figure
8
(
K
-
6375667
[
2
]
)
External
Connections
of
Three
Type
IAC
53
A
Relays
Used
for
Phase
-
to
-
Phase
and
Ground
Overcurrent
Protection
of
a
3
-
Phase
Circuit
A
-
C
BIS
1
2
A
-
C
BUS
1
3
2
3
52
.
52
1
TOC
8
A
-
C
TRIPPING
5
Toe
51
=
3
UNIT
11
=
1
Hll
*
1
IOC
X
1
H
1
6
hi
F
liriL
TRIPPING
|
RT
ACT
0
R
“
*
,
1
51
-
2
51
-
1
It
i
i f
i
t
10
9
2
^
f
2
-
y
M
6
Figure
9
.
(
K
6375668
-
1
)
External
Connections
of
Three
Type
IAC
53
A
Relays
used
in
Conjunction
with
Tripping
Reactors
for
Protection
of
a
3
-
Phase
Circuit
Figure
10
.
(
K
-
6375669
-
6
)
External
Connections
of
Three
Type
IAC
53
R
Relays
Used
For
3
-
Phase
Circuit
Protection
9
Courtesy of store.ips.us

GEH
-
1788
Type
IAC
Time
Overcurrent
Relay
APPLICATION
The
a
-
c
tripping
unit
is
used
in
Type
IAC
relays
where
a
reliable
direct
-
current
tripping
source
is
not
available
and
it
is
necessary
to
trip
the
breaker
from
the
current
-
transformer
secondary
.
T
«
5
S
I
BREAKER
TRIP
COIL
RATINGS
The
a
-
c
tripping
unit
has
a
continuous
rating
of
five
amperes
but
will
operate
on
a
minimum
current
of
3.5
amperes
.
It
should
be
used
with
three
-
ampere
trip
coils
.
The
contacts
of
these
units
will
transfer
current
-
transformer
secondary
current
up
to
100
amperes
.
For
applications
where
the
sec
-
ondary
current
exceeds
100
amperes
,
the
Type
REA
11
B
relay
,
which
has
contacts
rated
200
am
-
peres
,
can
be
used
in
conjunction
with
Type
IAC
overcurrent
relays
,
mounted
inside
the
Type
IAC
case
.
AC
TRIP
UNIT
NORMALLY
CLOSED
CONTACT
S
CURRENT
TRANS
IOC
:
:
T
0
C
LQC
AC
TRIP
UNIT
SHORTING
COIL
~
T
T
The
Type
REA
1
IB
is
not
CVJ
VO
BURDENS
vo
ID
Burdens
of
the
Type
REA
unit
are
given
in
the
following
table
:
vO
o
AC
TRIP
UNI
I
MAIN
COIL
Volt
-
Amperes
Impedance
in
Ohms
PF
IQ
£
CD
Frequency
Amps
60
0.80
12.2
5
0.49
50
5
0.33
0.80
8.3
Diagram
Illustrating
Operation
of
Type
IAC
Relays
having
an
A
-
C
Tripping
Unit
*
Fi
g
.
II
0.62
25
5
0.23
5.8
RECEIVING
,
HANDLING
AND
STORAGE
ing
the
relay
in
order
that
none
of
the
parts
are
injured
or
the
adjustments
disturbed
.
These
relays
,
when
not
included
as
a
part
of
a
control
panel
will
be
shipped
in
cartons
designed
to
protect
them
against
damage
.
Immediately
upon
receipt
of
a
relay
,
examine
it
for
any
damage
sustained
in
transit
.
If
injury
or
damage
resulting
from
rough
handling
is
evident
,
file
a
damage
claim
at
once
with
the
transportation
company
and
promptly
notify
the
nearest
General
Electric
Apparatus
Sales
Office
.
If
the
relays
are
not
to
be
installed
immed
-
iately
,
they
should
be
stored
in
their
original
car
-
tons
in
a
place
that
is
free
from
moisture
,
dust
and
metallic
chips
.
Foreign
matter
collected
on
the
outside
of
the
case
may
find
its
way
inside
when
the
cover
is
removed
and
cause
trouble
in
the
operation
of
the
relay
.
Reasonable
care
should
be
exercised
in
unpack
-
INSTALLATION
relay
types
are
shown
in
Figs
.
12
to
17
inclusive
.
Typical
wiring
diagrams
are
given
in
Figs
.
8
to
10
inclusive
.
LOCATION
The
location
should
be
clean
and
dry
,
free
from
dust
and
excessive
vibration
,
and
well
lighted
to
facilitate
inspection
and
testing
.
One
of
the
mounting
studs
or
screws
should
be
permanently
grounded
by
a
conductor
not
less
than
No
.
12
B
&
S
gage
copper
wire
or
its
equivalent
.
MOUNTING
INSPECTION
'
n
The
relay
should
be
mounted
on
a
vertical
The
outline
and
panel
diagram
is
shown
surface
.
At
the
time
of
installation
,
the
relay
should
be
inspected
for
tarnished
contacts
,
loose
screws
,
or
other
imperfections
.
If
any
trouble
is
found
,
it
should
be
corrected
in
the
manner
described
under
MAINTENANCE
.
in
Fig
.
20
.
CONNECTIONS
The
internal
connection
diagrams
for
the
various
10
*
Indicates
Revision
Courtesy of store.ips.us