1
7
5
3
4
2
6
1
Blown Limiter Indicators
2
Current Limiter
3
Secondary Disconnects
4
Main Disconnect
5
Isolating Transformer
6
Trip Unit Sensor
7
Arc Chute
Figure 3-2 Type DSLII Circuit Breaker (Front and Rear Views)
The frame width and height are the same for the DSII-308
through the DSII-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 disconnects or insufficient
interruption ratings into compartments carrying higher cur-
rent.
Circuit Protection is supplied by an electronic, micro-proces-
sor based tripping system. True RMS sensing is provided for
proper correlation with thermal characteristics of conductors
and equipment.
3-2 Type DSLII (Limiter) Circuit Breaker
Type DSLII Circuit Breakers are coordinated combinations of
standard DSII Circuit Breakers and series connected current
limiters. The primary purpose of the current limiters is to
extend the interrupting rating of the DSII Circuit Breaker up
to 200,000 amps (Figure 3-2).
DSLII Circuit Breakers are intended for applications requir-
ing 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.
Effective July 2010
Instructional Book
IB694C694-03
16
eaton corporation
www.eaton.com
