I.
B.
694C694-02
SECTION
1:
INTRODUCTION
1-1
GENERAL INFORMATION
Type DSll and DSLll Power Circuit Breakers are hori-
zontal drawout magnetic air circuit breakers utilizing an
electronic tripping system. They are designed for use
in
metal enclosed switchgear assemblies having maximum
voltages of 635 volts AC for Type DSll breakers and
600 volts AC for Type DSLll breakers. Depending on
the specific breaker being considered, DSll and DSLll
breakers are available in frame sizes from 800 through
5000 amperes with interrupting ratings as high as
85,000 amperes rms symmetrical for Type DSll and
200,000 amperes rms symmetrical for Type DSLll
breakers. (Figure 1-1, Tables
1.1
and 1.2). The breaker
nameplate provides complete rating information and all
DSll breakers conform to applicable NEMA, ANSI and
IEEE standards (Figure 1-2).
Each DSll and DSLll breaker consists of a basic break-
er
assembly, three interrupter assemblies (arc chutes),
barriers and an electronic trip unit. DSLll breakers have
integrally mounted, series connected current limiters.
The purpose of the current limiters is to extend the inter-
rupting rating of the standard DSll breaker (Figure
1-3).
Page
1
The Type DSll breaker is a four position drawout
(Connect, Test, Disconnect and Remove) design sup-
plied with either a manually or electrically operated, two-
step stored energy mechanism. This type of mechanism
assures positive control at the instant of closing the
main contacts.
Controls and indicators are functionally grouped on the
front of the breaker. The faceplate,
in
conjunction with a
closed breaker compartment door, provides a double
steel safety barrier.
DSll breakers can be withdrawn on extension rails for
inspection, minor maintenance
or
a visual inspection of
the inside of the breaker compartment. The captive
extension rails are a permanent part of the breaker com-
partment (Figure
1-4).
NOTICE
Please read and understand these instructions
before attempting
to
unpack, operate
or
maintain
this equipment. Study the breaker and its mecha-
nism carefully before attempting to operate it on an
energized circuit.
DSll-632
DSll-840
DSll-308
Figure
1-1
Type OSI/ Circuit Breaker Family
Effective
07
/97
Courtesy of NationalSwitchgear.com
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