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GEK-73\O,
Power
Circuit Breokers
SHUNT TRIP
AND t'NDERVOTIAGE
DEVICE
(FrG5.
19
AND 20)
As
shown
in
the
illustrations,
these devices are
mounted
tothe underside
of
thebreakerfront frame.
A
breaker may
have
as many as
one
each
of
these
devices,
plus a secondshunt
tripor
a secondunder-
voltage device.
Re
plocemenf
If
it
is
necessary to
replace
or
add
one
of these
devices, the easiest procedure
is
to remove
the
mounting braeket (3),
Fig" 19,
from
the
breaker
frame
(4)
and
remove the device from
the
bracket.
If a
replacementor newdevice
is
ordered,
a
mount-
ing
bracket
will
be supplied
with the device.
If
a
second shunt
trip
(5)
or
undervoltage de-
vice
(6)
is
added,
this
is
mounted
by
means
of
an
additional bracket
(?)
as shown. This
additionaL
bracket
is
fastened
by two
of the
hex
head
bolts
(8)
used
to
fasten the buffer assemblv
to
the
breaker
frame.
If
the
second
device added
is
an undervoltage
device,
a
new
buffer
assembly block
will
be sup-
plied.
This
is
required
for
clearance. In this
case,
t}tebuffer
assembly
mustbe taken
off,
disassembled,
andremounted together
with the number two under-
l3
9
4r+
|
3.
Mounting Bracket
4.
Breaker Frarne
5.
Second
Shunt
Trip
7.
Additional Bracket
8.
Fasteners
for
Bracket
As
sernbly
9.
Buffer
I0
.
Arrnature
1I
.
Magnet
12. Trip
Paddle
13.
Second
Trip
Paddle
li'-/
i
I
I
I
to
tl
5
22
Fig.
19.
(0108D8125) Shunt
trip
mounting
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