Features and Characteristics
Drawout Construction
Type SSD (standard break) and S H D ( H i-Break®) Power Break
II d rawout breakers are used in type S PSDOS and SPHDOS
substructures, providing the convenience and safety inherent
in drawout breaker construction. Drawout construction per
mits activation of a new feeder. rapid circuit breaker replace
ment. or inspection and maintenance of a breaker without
the inconvenience of de-energizing an entire switchboard.
Features
(see photos. following page)
1) Primary disconnects:
prima ry power is fed through m ul
tiple finger primary disconnect terminals when connected
to the primary stabs in the substructure.
2) Secondary disconnects:
control signals a re provided
through the 72 (36 maximum each side) secondary
disconnect terminals in the test and connected positions
only.
3)
Wheels:
the breaker has rollers w h ich allow the unit to
ride on the substructure's retractable rails for easy re
moval and i nstallation.
4) Wrench interlock:
an interlock prevents engagement of
the racking wrench when the breaker contacts are closed.
This prevents d isconnecting a closed breaker.
5) Drawout position indicator and switch:
a drawout posi
tion indicator d isplays whether the breaker is in the con
nected, test or disconnected position.
6)
Padlockin g device:
a padlocking provision accessory is
available to prevent access to the racking shaft, prevent
ing movement of the breaker between the disconnected,
test and connected positions. (Not shown.)
7)
Liftin g bar:
a lifting bar is available as an accessory, and
should be used to assist in safe handling of the drawout
breaker.
8) Manual motor cut-off switch:
provided as standard
6
- prevents motor charge when racking breaker in from
disconnect to test position.
Other
•
Drawout interlock:
this interlock will trip a closed b reaker
before the primary disconnects are engaged or disen
gaged in the event that the wrench interlock is intention
ally defeated.
•
Drawout mechanism:
a racking shaft powers a centrally
mounted power screw, through a chain d rive, into a fixed
nut in the substructure. A special speed w rench is ava i l
able with an integral
liz''
square d rive socket. The wrench is
used for racking the breaker in and out of the substructure.
•
Rejection featu re:
a built-in rejection feature prevents
insertion of a breaker into an incorrect s ubstructure. This
prevents either: insertion of a standard b reak breaker into
a Hi-Break breaker substructure. or insertion of a higher
ampere rated breaker into a lower ampere rated substruc
ture, or both.
•
Shutters:
shutters a re available as an accessory to protect
personnel from inadvertently touching the primary stabs of
an energized switchboard when the drawout breaker u n it
is removed.
•
By-pass switch:
a by-pass switch accessory has NO
and NC single-pole double-throw (SPDT) contacts. which
change state when the breaker is racked from the con
nected to the test position. The switch is available in 2, 4,
and 6-contact modules.
•
Substructure:
the substructure is a self-contained frame
work serving as a stationary receptacle for Power Break
I I d rawout breaker types S PSDOS and SPHDOS. It permits
easy activation of a new circuit in a spare compartment
(hole filler). rapid breaker replacement and simplifies
inspection and maintenance. The substructure is designed
for convenient mounting, with h oles provided for bolting on
a shelf of supports. Holes a re a lso provided in the primary
stabs for bolting to busbars or terminal l ugs. The substruc
ture also has retractable rails which aid in
the
installation
of the drawout breaker.
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