ABB CO User Manual

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54
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RE LAY
CA S E
Internal
Schematic
of
the
Circuit
Opening
Type
CO
Relay
,
with
Indicating
Instantaneous
Trip
,
in
Type
FT
-
21
Case
Fig
.
1
.
Internal
Schematic
of
the
Circuit
Opening
Type
CO
Relay
in
Type
FT
-
21
Case
Fig
.
2
.
OPERATION INDICATOR
(
01
)
CHARACTERISTICS
The
operation
indicator
is
a
small
clapper
type
device
.
A
magnetic
armature
is
attracted
to
the
magnetic
core
upon
energization
of
the
switch
.
When
the
switch
closes
two
fingers
on
the
arma
-
ture
deflect
a
spring
located
on
the
front
of
the
switch
,
which allows
the
operation
indicator
target
to
drop
.
The
relays
are
available
in
the
following
current
range
:
TAPS
RANGE
4
5
6
7
8
10
12
4
-
1 2
The
front
spring
,
in
addition
to
holding
the
target
,
provides
restraint
for
the
armature
and
thus controls
the
pickup
value
of
the
switch
.
The
circuit
-
opening
relay
is
recommended
only
in
the
4
to
1
2
ampere
range
.
A
lower
range
is
not
desirable
because
the
burden
of
a
low
-
range
trip
coil is
too
heavy
on
the
current
transformer
.
One
trip
coil is
required
for
each
relay
.
INDICATING
INSTANTANEOUS
TRIP
UNIT
(
IIT
)
The
burden
of
the
auxiliary
current
trans
-
former
at
4
amps
,
is
4.6
VA
with
contacts
IIT
or
CO
closed
and
5.7
VA
with
contacts
open
.
The
instantaneous
trip
unit
is
a
small
a
-
c
oper
-
ated
clapper
type
device
.
A
magnetic
armature
,
to
which
leaf
-
spring
mounted
contacts
are
attached
,
is
attracted
to
the
magnetic
core
upon
energiza
-
tion
of
the switch
.
When
the
switch closes
,
the
moving
contacts
bridge
two
stationary
contacts
completing
the
trip
circuit
.
Also
,
during
the
op
-
eration
.
two
fingers
on
the
armature
deflect
a
spring
located
on
the
front
of
the
switch which
allows
the
operation
indicator
target
to
drop
.
The
time
vs
.
current
characteristics
are
shown
in
Figs
.
3
to
9
.
These characteristics
give
the
con
-
tact
closing
time
for
the
various
time
dial
settings
when the
indicated
multiples
of
tap
value
current
are
applied
to
the
relay
.
A
core screw
accessible
from
the
top
of
the
switch
provides
the
adjustable
pickup
range
.
2
Courtesy of NationalSwitchgear.com

ABB CO Specifications

General

Brand	ABB
Model	CO
Category	Relays
Language	English