1.8. 33-790-11
Page 1
Introduction
These instructions cover the description, operation and
maintenance
of
Cutler-Hammer Type DS and Type DSL
Low Voltage AC Power Circuit Breakers and Type
DS
Drawout Fuse Trucks. These breakers are usually sup-
plied as part
of
low voltage metal enclosed switchgear
of
the four-position drawout type. These instructions apply
only to the circuit breaker and its auxiliary drawout details
which have been designed as a completely integrated
drawout unit. Type
DS
Breakers (not DSL) may also be
supplied
in
a fixed mounted version.
In
this case the sec-
tions
of
this book referring to the levering device, position
interlocks, and spring discharge interlock will not apply.
The DS and DSL Circuit Breakers operate
on
the mag-
netic De-ion principle
of
interruption.
In
these breakers
the arc rises into a series
of
insulated steel plates. The
plates break the rising arc into a series
of
smaller arcs to
cool and extinguish them and funnel the heat to ambient
air.
DS and DSL Breakers are available for application at
voltages from 208 to 600 Vac; with continuous currents
of
50
to 4000 amps; and with interrupting capabilities up to
200,000 amps. Refer to the breaker nameplate for the
complete rating information for any given breaker. Break-
ers conform to NEMA, ANSI and IEEE standards.
TYPE
OS
AND DSL BREAKERS ARE PROTECTIVE
DEVICES. AS SUCH, THEY ARE MAXIMUM CUR-
RENT RA TED DEVICES. THEREFORE, THEY
SHOULD NOT UNDER
ANY
CIRCUMSTANCES BE
APPLIED OUTSIDE THEIR NAMEPLATE RATINGS.
OPERATION OUTSIDE OF THESE RATINGS MAY
CAUSE THE EQUIPMENT TO FAIL, RESULTING
IN
BODILY INJURY AND PROPERTY DAMAGE.
The available
DS
and DSL Breakers and their rated per-
formance capabilities are given
in
Tables 1 and
2.
Table 1 - Type DS Breaker Ratings
Interrupting Ratings, RMS Symmetrical Amperes
Breaker Frame Size,
With Instantaneous Trip
Type
Amp.
208-240V
480V 600V
DS-206
800 42,000 30,000
30,000
DS-206S 800 50,000 42,000 42,000
DS-416 1600
65,000 50,000
42,000
DS-416S 1600 65,000 65,000 50,000
DS-420
2000
65,000 65,000 50,000
DS-632 3200 85,000 65,000 65,000
DS-840 4000 130,000
85,000 85,000
l Also short-time ratings.
i Short circuit ratings
of
non-automatic breakers except the DS-840 which
is
65,000.
Maximum voltages at which the interrupting ratings apply are:
System Voltage Maximum Voltage
208 or 240 254
480 508
600 635
Interrupting ratings are based
on
the standard duty cycle con-
sisting
of
an
opening operation, a 15 second interval and a
close-open operation,
in
succession, with delayed tripping
in
case
of
short-delay devices.
The standard duty cycle for short-time ratings consists
of
main-
taining the rated current for two periods
of
1/2 second each,
with a 15-second interval of zero current between the two periods.
Effective October 1998
With Short Delay TriPli
208-240V
480V 600V
30,000 30,000
30,000
42,000 42,000 42,000
50,000
50,000
42,000
65,000 65,000 50,000
65,000 65,000 50,000
65,000 65,000 65,000
85,000 85,000 85,000
Courtesy of NationalSwitchgear.com
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