Table Of Contents - Eaton Magnum Air MWN-408 User Manual

CONTENTS
1 INTRODUCTION ....................................................................................................................................................... 5
1.1 General information ..............................................................................................................................5
1.2 Purpose .........................................................................................................................................6
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1.3 Safety features .....................................................................................................................................6
1.4 Safe practices .......................................................................................................................................8
1.5 Qualified personnel...............................................................................................................................8
1.6 Other publications and documentation.................................................................................................8
2 RECEIVING, HANDLING AND INSTALLATION........................................................................................................ 9
2.1 General information ..............................................................................................................................9
2.2 Suggested tools....................................................................................................................................9
2.3 Unpacking circuit breaker .....................................................................................................................9
2.3.1 Storing circuit breaker ......................................................................................................................9
2.4 Lifting circuit breaker ..........................................................................................................................10
2.5 Circuit breaker inspection ...................................................................................................................10
2.6 Adapting cassette...............................................................................................................................11
2.6.1 Rejection interlocks .......................................................................................................................11
2.6.2 Installing secondary jumpers .........................................................................................................12
2.7 Installing drawout circuit breaker........................................................................................................12
2.7.1 Circuit breaker positioning .............................................................................................................12
2.7.2 levering circuit breaker...................................................................................................................14
2.8 Fixed circuit breaker ...........................................................................................................................15
2.9 Circuit breaker operation ....................................................................................................................15
3 CIRCUIT BREAKER DESCRIPTION AND OPERATION .......................................................................................... 16
3.1 Introduction ........................................................................................................................................16
3.2 Basic circuit breaker assembly ...........................................................................................................20
3.3 Pole units............................................................................................................................................20
3.3.1 Primary moving contacts ...............................................................................................................20
3.3.2 Primary stationary contacts............................................................................................................21
3.4 Operating mechanism ........................................................................................................................22
3.4.1 Manual operation ...........................................................................................................................22
3.4.2 Electrical operation ........................................................................................................................23
3.4.3 Anti-pump feature..........................................................................................................................23
3.5 Arc chambers .....................................................................................................................................23
3.5.1 Arc chute .......................................................................................................................................23
3.6 Electronic tripping system ..................................................................................................................24
3.6.1 Microprocessor-based trip unit ......................................................................................................24
3.6.2 Rating plug.....................................................................................................................................26
3.6.3 Current sensors .............................................................................................................................26
3.6.4 Trip actuator...................................................................................................................................27
3.6.5 Mechanical trip flag........................................................................................................................27
3.6.6 Making current release ..................................................................................................................27
3.6.7 High instantaneous trip option .......................................................................................................28
3.6.8 Voltage taps ...................................................................................................................................28
3.7 Secondary contacts and connection diagrams....................................................................................28
3.7.1 Connection diagrams .....................................................................................................................29
3.8 Accessory devices..............................................................................................................................36
3.8.1 Plug-in electrical accessories .........................................................................................................36
3.8.2 Internal electrical accessories ........................................................................................................38
3.8.3 Mechanical accessories .................................................................................................................40
4 DRAWOUT CIRCUIT BREAKER AND CASSETTE.................................................................................................. 43
4.1 General ...............................................................................................................................................43
4.2 Drawout cassette ...............................................................................................................................43
4.3 Drawout circuit breaker dimensions ...................................................................................................43
4.4 Drawout cassette dimensions ............................................................................................................43
5 FIXED CIRCUIT BREAKER...................................................................................................................................... 45
5.1 General ...............................................................................................................................................45
5.2 Fixed circuit breaker dimensions ........................................................................................................45
1812.900A
Magnum
3