Table Of Contents - Eaton MDN-408 Instructions For Installation, Operation And Maintenance

Instruction Book
Page iv
Effective: May 2006
SECTION 1: INTRODUCTION
1-1 General Information.............................................................................................................................................1
1-2 Safety Features ...................................................................................................................................................2
1-3 Safety Practices ..................................................................................................................................................2
1-4 Qualified Personnel .............................................................................................................................................3
1-5 Other Publications and Documentation...............................................................................................................3
SECTION 2: RECEIVING, HANDLING AND INSTALLATION
2-1 General Information.............................................................................................................................................4
2-2 Suggested Tools .................................................................................................................................................4
2-3 Unpacking Circuit Breaker...................................................................................................................................4
2-3.1 Storing Circuit Breaker ...........................................................................................................................4
2-4 Lifting Circuit Breaker ..........................................................................................................................................5
2-5 Circuit Breaker Inspection ...................................................................................................................................6
2-6 Installing Drawout Circuit Breaker .......................................................................................................................6
2-6.1 Rejection Interlocks ................................................................................................................................6
2-6.2 Circuit Breaker Positioning .....................................................................................................................7
2-6.3 Levering Circuit Breaker.........................................................................................................................9
2-7 Fixed Circuit Breaker.........................................................................................................................................10
2-8 Circuit Breaker Operation..................................................................................................................................10
SECTION 3: CIRCUIT BREAKER DESCRIPTION AND OPERATION
3-1 Introduction........................................................................................................................................................11
3-1.1 MDSL Application/Operation ................................................................................................................15
3-2 Basic Circuit Breaker Assembly ........................................................................................................................15
3-3 Pole Units ..........................................................................................................................................................15
3-3.1 Primary Moving Contacts .....................................................................................................................16
3-3.2 Primary Stationary Contacts.................................................................................................................16
3-4 Operating Mechanism .......................................................................................................................................17
3-4.1 Manual Operation.................................................................................................................................17
3-4.2 Electrical Operation ..............................................................................................................................18
3-4.3 Anti-Pump Feature ...............................................................................................................................18
3-5 Arc Chambers ...................................................................................................................................................18
3-5.1 Arc Chute .............................................................................................................................................18
3-6 Electronic Tripping System................................................................................................................................19
3-6.1 Microprocessor-based Trip Unit ...........................................................................................................19
3-6.2 Rating Plug...........................................................................................................................................21
3-6.3 Current Sensors ...................................................................................................................................21
3-6.4 Trip Actuator .........................................................................................................................................22
3-6.5 Mechanical Trip Flag ............................................................................................................................22
3-6.6 Making Current Release.......................................................................................................................22
3-6.7 High Instantaneous Trip Option (Magnum DS Only)............................................................................22
3-6.8 Voltage Taps ........................................................................................................................................23
3-7 Secondary Contacts and Connection Diagrams ...............................................................................................23
3-7.1 Connection Diagrams...........................................................................................................................24

TABLE OF CONTENTS

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I.B. 2C12060H08