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,.r'
Accessories
Zone
lnterlocking Components
Static
Trip lll trip
units with
the
"-TZ"
suff
ix
are
capable
of
being
connected together into
a
zone
interlocking system,
Zone
interlock expanders and couplers are used
for
connections
between Static
Trip
Ill trip
units. Multiplexer/Translators
are
used for
connections
between Static
Trip
I
I
units and
Sentron
Series molded case
or SB
insulated case
circuit
breakers with
zone interlocking
capability
(for
additional
information refer
to
the Multiplexer Translator
Information
and lnstruction
Guide,
bulletin
number
2.21
-1
A).
Zone
lnterlock
Expanders
Two
zone
interlock expander models are available
for
use
with Static Trip
lll
units
to connect a single upstream circuit
breaker
to multiple downstream circuit breakers.
One model
includes
a
cable for direct
connection
to the
upstream
trip
unit's
sub
"D"
connector;
a
second version provides for
addi-
tional
inputs
from
downstream
trip
units.
Each
expander
has
6
optically-isolated
input
channels
for
connection
to
down-
stream trip
units
Each expander also includes
a
set of
paralle
output terminals
for
connecting the zone interiock
signa
to
an expander farther upstream. No external power
supply
is
req
u
ired.
Zone
Inter
ock Expanders
Zone
lnterlock Coupler
The
zone interlock
coupler
is
used
to
connect
a
single
trip
unit
jnto a
zone interlock system, and includes a cable for direct
connection to the
trip
unit's
sub
"D" connector.
The
coupler
also has one
optically-isolated
input
and
one
output
channel.
The input channel may be used to connect to another
coupier
associated with a downstream
trip
unit.
The
output
channel
may be used
to
drive
up to
two upstream coupler
or
expander
input channels
connected
in
parallel.
No
external power sup-
ply
is required.
Zone Interlocking Coupler
Sealable
Transparent
Cover
The
transparent
cover
is
used to help prevent tampering with
the overcurrent protection
adlustments. The
cover
is
held
in
place
over the
face
of
the
trip
unit with
two screws,
Holes
in
the
screws allow
the
cover to be
secured
in
place with
a
wire and
lead seal. When the
cover
is in
place,
the
overcurrent protection
adjustments
are
nor
accessib'e.
Stat;c
T.
p
lr
w.tl^
Transparert
Cover
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