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The frame width and height are the same for the DSll-
308 through the DSll-620 circuit breakers. They could be
placed into compartments having the same dimensions.
However, interference interlocks are provided to prevent
insertion of circuit breakers with mismatching discon-
nects or insufficient interruption ratings into compart-
ments carrying higher current.
Circuit Protection is supplied by an electronic, micro-
processor based tripping system. True RMS sensing is
provided for proper correlation with thermal characteris-
tics of conductors and equipment.
II
Blown Limiter Indicators
El
Current Limiter
II
Secondary Disconnects
II
Main Disconnect
El
Isolating Transformer
II
Trip Unit Sensor
II
Arc Chute
l.B.
694C694-02
3-2 TYPE DSLll (LIMITER) CIRCUIT BREAKER
Type DSLll Circuit Breakers are coordinated combina-
tions of standard DSll Circuit Breakers and series con-
nected current limiters. The primary purpose of the cur-
rent limiters is to extend the interrupting rating of the
DSll Circuit Breaker up to 200,000 amps (Figure 3-2).
DSLll Circuit Breakers are intended for applications
requiring the overload protection and switching functions
of air circuit breakers
on
systems whose available fault
currents (1) exceed the interrupting ratings of the circuit
breakers alone and/or (2) exceed the withstand and
interrupting ratings of downstream circuit components.
Figure 3-2 Type DSLI/ Circuit Breaker (Front
and
Rear Views)
Effective
07
/97
Courtesy of NationalSwitchgear.com
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