InstructionBook
Pa
e 4
IB131009EN
TABLE OF CONTENTS
SECTION 1 INTRODUCTION
PAGE
1-1
Type W-VAC, W-VACR and W-VACW Breaker Ratings ....................................................................................... 1
SECTION 2 SAFE PRACTICES
SECTION 3 RECEIVING, HANDLING AND STORAGE
3-1 Receiving ............................................................................................................................................................... 14
3-2 Handling ................................................................................................................................................................ 15
3-3 Storage .................................................................................................................................................................. 15
SECTION 4 INSTALLATION
4-1 Initial Inspection and Operation ............................................................................................................................ 22
4-2 Manual Operation Check ...................................................................................................................................... 22
4-3 Vacuum Interrupter Integrity ................................................................................................................................. 22
4-4 Insulation ............................................................................................................................................................... 22
4-5 Contact Erosion and Wipe .................................................................................................................................... 22
4-6 Primary Circuit Resistance .................................................................................................................................... 22
4-7 Nameplate ............................................................................................................................................................. 22
4-8 Electrical Operations Check .................................................................................................................................. 22
4-9 Breaker/Compartment Interface Check ................................................................................................................ 24
SECTION 5 DESCRIPTION AND OPERATION
5-1 Interrupter Assembly ............................................................................................................................................. 26
5-1.1 Vacuum Interrupter ............................................................................................................................................... 26
5-1.2 Contact Erosion Indicator (Except 3150A) ........................................................................................................... 27
5-1.3 Contact Erosion Indicator (3150A Only) ............................................................................................................... 27
5-1.4 “T” Cutout Loading Spring Indicator ...................................................................................................................... 28
5-1.5 Contact Wipe and Stroke ...................................................................................................................................... 28
5-1.6 Pole Unit Support Molding .................................................................................................................................... 28
5-2 Stored Energy Mechanism .................................................................................................................................... 29
5-2.1 Operation of Stored Energy Mechanism .............................................................................................................. 29
5-2.2 Charging ................................................................................................................................................................ 29
5-2.3 Closing Operation .................................................................................................................................................. 29
5-2.4 Tripping Operation................................................................................................................................................. 32
5-2.5 Trip Free Operation ............................................................................................................................................... 32
5-3 Control Scheme ............................................................................................................
........................................ 32
5-3.1 Timing .................................................................................................................................................................... 32
5-3.2 Secondary Disconnects ........................................................................................................................................ 32
5-3.3 Undervoltage Trip Device...................................................................................................................................... 33
5-4 Interlocks ............................................................................................................................................................... 33
5-4.1 Floor Tripping, Spring Release and Anti-Latch Interlocks .................................................................................... 33
5-4.2 Levering Interlock .................................................................................................................................................. 33
5-4.3 Anti-Close Interlock ............................................................................................................................................... 33
5-4.4 Earthing Drive Interlock ......................................................................................................................................... 33
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