Effective July 2010
Instructional Book
IB694C694-03
taBLe oF contentS
SECTION 1: INTRODUCTION
Page
1-1 General Information .................................................................................................................7
1-2 Safety Features ........................................................................................................................8
1-3 Safety Practices .......................................................................................................................8
1-4 Qualified Personnel ..................................................................................................................9
1-5 Other Publications and Documentation ...................................................................................9
SECTION 2: RECEIVING, HANDLING AND INSTALLATION
2-1 General Information ............................................................................................................... 11
2-2 Unpacking Circuit Breaker ...................................................................................................... 11
2-2.1 Storing Circuit Breaker .................................................................................................. 11
2-3 Lifting Circuit Breaker ............................................................................................................ 11
2-4 Breaker Inspection ................................................................................................................. 12
2-5 Levering Circuit Breaker ......................................................................................................... 13
2-6 Drawout Dummy Element ..................................................................................................... 14
2-7 Fixed Circuit Breaker .............................................................................................................. 14
SECTION 3: EQUIPMENT DESCRIPTION
3-1 Type DSII Circuit Breaker ....................................................................................................... 15
3-2 Type DSLII (Limiter) Circuit Breaker ....................................................................................... 16
3-3 Basic Breaker Assembly ........................................................................................................ 17
3-4 Pole Units ............................................................................................................................... 17
3-4.1 Primary Moving Contact Assembly .............................................................................. 17
3-4.2 Primary Stationary Contact Assembly ..........................................................................18
3-5 Interphase Barriers ................................................................................................................18
3-6 DE-ION Arc Chutes (Interrupter Assemblies) .........................................................................20
3-7 Electronic Tripping System .....................................................................................................20
3-7.1 Electronic Trip Unit .........................................................................................................22
3-7.2 Sensors..........................................................................................................................22
3-7.3 Trip Actuator ...................................................................................................................22
3-8 Operating Mechanism ...........................................................................................................23
3-8.1 Manually Operated Circuit Breaker ...............................................................................23
3-8.2 Power Operated Circuit Breaker ...................................................................................24
3-9 Movable Primary and Secondary Contacts ............................................................................24
3-10 Standard and Optional Devices ..............................................................................................25
3-10.1 Motor Cut-Off Switch (LS) ...........................................................................................25
3-10.2 Spring Release Device (SRD) ......................................................................................25
3-10.3 Anti-Pump Relay (Y).....................................................................................................25
3-10.4 Shunt Trip Attachment (STA) ........................................................................................25
3-10.5 Latch Check Switch .....................................................................................................26
3-10.6 Auxiliary Switch ...........................................................................................................26
3-10.7 Undervoltage Trip Attachment (UVTA) .........................................................................26
3-10.8 Overcurrent Trip Switch ...............................................................................................27
3-11 Miscellaneous Details ............................................................................................................27
3-11.1 Interference Interlock ...................................................................................................27
3-11.2 Ground Contact ...........................................................................................................28
3-11.3 Close Bar Guard ...........................................................................................................28
3-11.4 Operation Counter
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28
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