Accessories
Power
Supplies
Static
Trip lllC/CP/CPX
modei trip units require
external
15V
dc
control
power
for
the communications microprocessor. Three
power
supply models
are available with suff icient volt-ampere
capacity for up to 2,
8 or
16
trip units.
Because
BDUs require
the sarne amount of
power
as
communicating trip units,
you
must
count both BDUs and trip units when
determining the
power
supply capacity
you
need.
For example, the
power
supply
with
a capacity for
eight
trip
units can only support
four
trip units
if
you
attach a BDU to each trip
unit.
The
power
suppiies have I2OV
ac
1125V
dc input and typically mount in an
insLri,ment
comparr-ent,
Typica
power
supply mounted in rnstrument
compartment
Portable
Test
Set
-
Type PTS4
Sremens'
portable
test set
type
PTS4 is
designed
for
testing
Static
Trip lll
trip units. The test set
provides
a means
of testing
the magnetic
tripping actuator as well as the trlp unit. The
portable
test set,
using
power
from
an ordinary
120 volt
convenience outlet, can
provide
clrcuit breaker testing
equivalentto
much
more expensrve and cumbersome
primary
current testing. The instructions for
testing the Static Trip lll
with the PTS4 were
presented
in
the Testing sectron,
For
additional
information
see Portabie Test
Set
-
Type PTS4
lnstruction
Guide SG-31 38
Communications Secondary
Disconnects
A
special
ly-designed
cornmunications
secondary disconnect
assembly is used for
Static
Trip lllC/CP/CPX trip unit's com-
munications, l5V dc control
power
and alarm
signals. This
communications disconnect
has
gold plated
contacts
for
reliable
electrical connection.
The communications discon-
nect is
self-aligning
and makes contact in the connected
position
only, Cubicle and breaker assemblies
are avallable
for
upgrades to
Type RL
circuit
breakers, for use by OEM s
or
for retrofit
applications.
Cubicle
Disconnect in Type RL circurt breaker compartment
Breaker Disconnect on Type RL crrcuit breaker
PTS4 Portable Test Set
45
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