GE IAC57A - Page 11

Time
Overcurrent
Relays
Type
IAC
GEH
-
1753
APPLICATION
which
has
contacts
rated
200
amperes
,
can
be
used
in
conjunction
with
IAC
overcurrent
relays
.
The
REA
11
B
is
not
mounted
inside
the
IAC
case
.
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
.
BURDENS
Burdens
of
the
REA
unit
are
given
in
the
following
table
:
RATINGS
The
a
-
c
tripping
unit
has
a
continuous
rating
of
five
amperes
but
will
operate
on
a
minimum
current
of
3.5
amperes
.
They
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
second
-
ary
current
exceeds
100
amperes
,
the
REA
1
IB
relay
,
Impedance
in
Ohms
Volt
-
Amperes
Frequency
Amp
P
F
60
5
0.49
0.80
12.2
50
0.33
5
0.85
8.4
5
0.62
25
0.23
5.8
RECEIVING
,
HANDLING
AND
STORAGE
packing
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
the
relay
,
an
examination
should
be
made
for
any
damage
sustained
during
shipment
,
injury
or
damage
resulting
from
rough
handling
is
evident
,
a
claim
should
be
filed
at
once
with
the
transportation
company
and
the
nearest
Sales
Office
of
the
General
Electric
Company
notified
promptly
.
Reasonable
care
should
be
exercised
in
un
-
If
the
relays
are
not
to
be
installed
immediately
,
they
should
be
stored
in
their
original
cartons
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
.
If
INDUCTION
UNIT
~
T
1
INDUCTION
±
^
UNIT
\
SEAL
-
IN
INSTANT
UNIT
UNIT
SEAL
-
IN
UNIT
7
T
T
V
*
v
•
V
V
N
/
N
4
N
/
y
•
^
*
I
v
"
V
xy
3
5
1
1
5
6
o
2
2
6
6
INTERNAL
CONNECTIONS
(
FRONT
VIEW
)
*
-
SH
0
RT
FINGER
SHORT
FINGER
Fig
.
12
.
(
K
-
6209661
[
11
)
Internal
Connections
for
the
Type
IAC
51
B
Relay
(
Front
View
)
11
.
(
K
-
6209658
-
10
)
Internal
Connections
fen
Fig
.
the
Type
IAC
51
A
Relay
(
Front
View
)
.
9
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