,.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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