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I.
Remove the two
SCrews
holding the terminal block
cover bearing the terminal numbers
1,2,3,4,7,8,9.
This exposes the terminal block that connects the
static trip device to the wiring on the breaker.
2.
Loosen the seven screws
in
the bottom row of the
terminal block (it
is
not necessary to remove the
screws completely) and slide
out
the connecting
strip from under the screws.
3. Removing
the
connecting strip exposes one screw
just above the name "Stalic TripII"'
on
the face plate.
Remove this screw and slide the static trip unit out
by
pulling it toward you.
4.
To
install a unit, reverse steps 1-3. Be sure to tighten
all screws.
It
is
important to replace the terminal
block cover because
it
guards against accidental con-
tact with the live terminals. Also, the terminal num-
bers on
it
arc helpful
in
testing.
Available Types
Nine types of SIalic Tripa devices are available. Similar
in
many respects, they differ only
in
their specific appli-
cation. All use identical tripping transformer inputs and
provide output
sign31s
to the tripping actuator. Several
types are shown in Figure I.
The type designation
is
coded to indicate the functional
elements: T
,-
LONG-TIME
delay element, S =
SHORT-TIME
delay element, I = INSTANTANEOUS
element, G
,=
GROUND
current element and
(T)
= a
TARGET
which indicates when tripping
is
initiated by
the ground clement.
For
each clement except INSTAN-
TANEOUS there are two adjustment knobs on the front
of the device. one for pick-up setting and one for delay
sctting. The instantaneous element has only one knob for
pick-up setting. See Figure
9.
Following are briefdescrip-
tions of the nine types:
TYPE
TI
-A dual trip device normally used for phase
overcurrent protection. The long time pick-up range
is
selected from the trip rating table and
is
continuously
adjustable from
"A"
thTU
"G"
in the field. The instan-
tancous element
is
continuously field adjustable from 3
to
12
mUltiples of the long time pick-up setting selected.
The long time delay
is
field adjustable with a choice of
six bands.
TYPE
T1G (optional) - A dual trip
dewice
which pro-
vides phase overcurrent protection same as Type
TI
plus
sensitive ground fault protection for 3-wlre and 4-wire
circuits on systems with either phase-to-phase
or
phase-
to-neutral loading. Ground current pick-up settings are
indcpendent of the phase pick-up settings; and continu-
ously adjustable
in
the field from
15%
through
100%
of the tripping transformer rating. When used on 4-wire
circuits. a fourth tripping transformer
is
required.
It
is
mounted
in
the cubicle, and wired to the breaker through
secondary disconnects.
TYPE
T1G(T)
(optional) -Same as Type TIG,
except a ground target
is
provided to give a visual indi-
cation of a trip initiated
by
a ground fault.
TYPE
TS (optional) - A selective trip device used for
phase overcurrent protection which provides time delay
tripping only.
It
allows complete field adjustment of the
long time band and pick-up plus the short time band
and pick-up.
The
short time pick-up
can
be adjusted
from 3 to 12 multiples of the long time pick-up setting.
Anyone
of the three short time bands can be chosen to
be
used with any of the six long time bands.
TYPE
TSG (optional) - A selective trip device which
provides phase overcurrent protection same as Type TS
plus sensitive ground fault protection for 3-wire and
4-wirc circuits on systems with either phase-to-phase or
phase-to-neutral loading. Ground current pick-up set-
tings arc independent of the phase pick-up settings, and
continuously adjustable
in
the field from
15%
through
100% of the tripping transformer rating. When used on
4-wire circuits, a fourth tripping transformer
is
required.
It
is
mounted
in
the cubicle, and wired to the breaker
through secondary disconnects.
TYPE
TSG(T)
(optional) -Same as Type TSG, ex-
cept a ground target
is
provided to give a visual indica-
tion of a trip initiated
by
a ground fault.
TYPE
TSI (optional) - A triple selective trip device
used for phase overcurrent protection which provides
long time delay, short time delay, and instantaneous
elements.
It
allows complete field adjustment of the long
time band and pick-up, the short time band and pick-up
and the instantaneous pick-up. Both the short time and
instantaneous clements
can
be adjusted to pick
up
at 3
to
12
multiples of the long time pick-up setting.
Anyone
of the three short time bands can be chosen to be used
with any of the six long time bands.
TYPE
TSIG (optional) - A triple selective trip device
which provides phase overcurrent protection same
as'
Type TSI plus sensitive ground fault protection for
3-wire and 4-wire circuits on systems with either phase-
to-phase
or
phase-to-neutral loading. Ground current
pick-up settings are independent of the phase pick-up set-
tings. and continuously adjustable in the field from IS%
through 100% of the tripping transformer rating. When
used
on
4-wire circuits, a fourth tripping transformer
is
required.
It
is
mounted
in
the cubicle, and wired to the
breaker through secondary disconnects.
TYPE
TSIG(T)
(optional) -Same as Type TSIG,
except a ground target
is
provided to give a visual indi-
cation of a trip initiated by a ground fault.
Time-Current Curves
";Figure 4
is
a set of curves for the Static Trip a devices.
'The
long-time element has a characteristic represented
by:
