GE IAC User Manual

GEK
-
86054
For
forms
51
and
up
,
the
standard
instantaneous
unit
has
the
following
ratings
,
listed
in
Table
VI
:
TABLE
VI
STANDARD
INSTANTANEOUS
UNIT
COIL
RATINGS
-
FORMS
51
AND
UP
C f T D T C C
f l D
PARALLEL
CONTINUOUS
RATINGS
ONE
SECOND
ft
RANGE
Series
Parallel
0.75
25.0
0.5
-
1.0
-
2.0
0.5
-
4.0
1.5
4.0
50.0
130.0
260.0
3.0
2.0
-
16.0
8.0
Series
Parallel
2.0
-
4.0
-
6.0
16.0
15.0
10.0
-
80.0
10.0
-
20.0
-
Series
Parallel
400.0
600.0
40.0
25.0
80.0
600.0
600.0
20.0
-
160.0
Series
Parallel
25.0
20.0
-
40.0
-
160.0
80.0
25.0
ft
Higher
currents
(
I
)
may
be
applied
for
shorter
lengths
of
time
(
T
)
in
accordance
with
the
formula
:
/
K
I
=
V
-
K
—
constant
T
The
current
-
closing
rating
of
the
contacts
is
30
amperes
for
voltages
not
exceeding
250
volts
.
CHARACTERISTICS
INDUCTION
UNIT
The
induction
unit
consists
of
a
conducting
disk
that
passes
through
the
poles
of
a
permanent
magnet
and
an
electromagnet
.
The
disk
is
free
to
rotate
with
a
vertically
suspended
shaft
,
but
is
restrained
in
one
direction
by
a
spring
.
When
energized
with
an
alternating
current
of
proper
magnitude
(
set
by
the
tap
position
)
,
the
electromagnet
produces
out
of
phase
fluxes
at
its
pole
faces
.
These
fluxes
interact
with
induced
currents
in
the
disk
to
produce
a
torque
on
the
disk
.
When
this
torque
exceeds
the
restraining
force
of
the
spring
,
the
disk
begins
to
rotate
at
a
speed
determined
by
the
magnetic
dragging
action
of
the
permanent
magnet
.
A
post
attached
to
the
rotating
shaft
travels
a
specific
distance
(
set
by
the
time
dial
)
,
and
makes
electrical
contact
with
a
fixed
member
.
Figure
6
gives
the
time
for
the
induction
unit
to
close
its
contacts
for
various
multiples
of
pickup
current
and
time
dial
settings
.
The
time
required
for
this
unit
to
reset
from
contact
closure
to
the
Number
10
time
dial
position
is
approximately
60
seconds
.
Burden
data
for
induction
unit
coils
is
listed
in
Table
VII
.
The
impedance
values
are
for
the
minimum
tap
.
The
impedance
for
other
taps
at
pickup
current
(
tap
6
Courtesy of NationalSwitchgear.com

GE IAC Specifications

General

Brand	GE
Model	IAC
Category	Relays
Language	English