GE GCX51A - Page 5

GE
1
-
98328
TABLE
II
MHO
UNIT
OHM
UNIT
*
*
ANGLL
Oh
MAX
.
TORQUE
RANGE
(
0
-
N
OHMS
)
RANGE
(
0
-
N
OHMS
)
BASIC
MIN
.
REACH
(
0
-
N
OHMS
)
BASIC
MIN
.
REACH
*
(
0
-
N
OHMS
)
RELAY
ms
O
.
l
/
O
.
2
/
0.4
174
0.1
/
4
T
Short
Reach
2.5
/
10
0.25
/
0.5
/
1.0
0.25
/
10
600
2.5
Standard
Reach
*
Adjustment
link
is
set
at
the
0.2
or
0.5
basic
min
.
reach
prior
to
shipment
.
The
angle
of
maximum
torque
of
the
MHO
unit
can
be
adjusted
up
to
75
°
with
resulting
increase
in
reach
to
approximately
120
%
of
the
reach
at
the
60
°
angle
of
maximum
torque
.
It
will
be
noted
that
for
each
relay
three
basic
minimum
reach
settings
are
listed
for
the
OHM
unit
.
Selection
of
the
desired
basic
minimum
reach
is
made
by
means
of
two
captive
tap
screws
on
a
tap
block
at
the
front
of
the
relay
.
The
reach
settings
of
the
OHM
and
the
MHO
units
can
be
adjusted
in
one
percent
(
1
%
)
steps
by
means
of
auto
-
transformer
tap
leads
on
the
tap
block
at
the
right
side
of
the
relay
.
First
-
zone
reach
of
the
OHM
unit
is
determined
by
the
No
.
1
leads
second
-
zone
reach
by
the
No
.
2
leads
,
and
the
reach
of
the
MHO
unit
,
by
the
L
leads
.
E
*
The
GCX
51
B
relay
includes
an
instantaneous
overcurrent
unit
identified
as
OC
on
The
short
-
reach
form
of
the
GCX
51
is
the
internal
-
connection
diagram
,
Figure
8
.
normally
furnished
with
an
OC
unit
having
a
4
-
16
ampere
calibration
range
,
standard
-
reach
form
is
available
with
OC
calibration
ranges
of
4
-
16
,
2
-
8
or
1
-
4
The
amperes
.
The
contacts
of
the
GCX
51
relays
will
close
and
carry
momentarily
30
amperes
DC
.
However
,
the
circuit
-
breaker
trip
circuit
must
be
opened
by
an
auxiliary
switch
contact
or
other
suitable
means
,
since
the
relay
contacts
have
no
interrupting
rating
.
The
0.6
/
2
ampere
target
seal
-
in
unit
used
in
the
GCX
51
relays
has
ratings
as
shown
in
Table
III
.
TABLE
III
TARGET
SEAL
-
IN
UNIT
0.6
Amp
lap
2.0
Amp
lap
Minimum
Operating
Carry
Continuously
Carry
30
Amps
for
Carry
10
Amps
for
DC
Resistance
60
Cycle
Impedance
2.0
amps
3.5
amps
4
secs
.
30
secs
.
0.13
ohms
0.53
ohms
0.6
amps
1.5
amps
0.3
secs
.
4
secs
.
0.6
ohms
6
ohms
5
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