December 19, 2022
© S&C Electric Company 2022, all rights reserved
Instruction Sheet 466-500
VacuFuse
®
II Self-Resetting Interrupter
Outdoor Distribution (12.47 kV through 27.0 kV)
For Overhead Distribution Transformer
Protection
Installation and Operation
Table of Contents
Introduction � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Qualified Persons
. . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Read this Instruction Sheet
. . . . . . . . . . . . . . . . . . .
2
Retain this Instruction Sheet
. . . . . . . . . . . . . . . . . .
2
Proper Application
. . . . . . . . . . . . . . . . . . . . . . . . . .
2
Operating Considerations
. . . . . . . . . . . . . . . . . . . . .
3
Warranty
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
Warranty Qualifications
. . . . . . . . . . . . . . . . . . . . . .
4
Application Note
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Safety Information � � � � � � � � � � � � � � � � � � � � � � � � 5
Understanding Safety-Alert Messages
. . . . . . . . . . .
5
Following Safety Instructions
. . . . . . . . . . . . . . . . . .
5
Replacement Instructions and Labels
. . . . . . . . . . .
5
Location of Safety Labels
. . . . . . . . . . . . . . . . . . . . .
6
Safety Precautions
� � � � � � � � � � � � � � � � � � � � � � � � �
7
Shipping and Handling � � � � � � � � � � � � � � � � � � � � 8
Inspection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Packing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Handling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Storage
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Returning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Before Starting � � � � � � � � � � � � � � � � � � � � � � � � � � 9
VacuFuse II Interrupter Parts
. . . . . . . . . . . . . . . . . .
9
Understanding the Closing Sequence
. . . . . . . . . . .
10
Understanding the LED Indicators and
POSITION Indicator
. . . . . . . . . . . . . . . . . . . . . . .
10
Installation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 12
Installing the Cutout Mounting
. . . . . . . . . . . . . . . . .
12
Installing a VacuFuse II Interrupter into the
Cutout Mounting
. . . . . . . . . . . . . . . . . . . . . . . . . .
13
Closing the VacuFuse II Interrupter into the
Cutout Mounting
. . . . . . . . . . . . . . . . . . . . . . . . . .
14
Operation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 15
If the VacuFuse II Self-Resetting Interrupter
Has Dropped Open . . . . . . . . . . . . . . . . . . . . . . .15
If Maintenance Is to Be Performed on the
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Opening and Closing the VacuFuse II Interrupter . . .16
Removing the VacuFuse II Interrupter
from the Cutout Mounting . . . . . . . . . . . . . . . . . . .18
Operation Using Loadbuster®—
The S&C Loadbreak Tool . . . . . . . . . . . . . . . . . . .19
Troubleshooting � � � � � � � � � � � � � � � � � � � � � � � � 23
Unable to Close a VacuFuse II Interrupter into its
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
In Mounting With Contacts Open . . . . . . . . . . . . . . 23
Vacuum Interrupter Cannot Be Closed . . . . . . . . . . 23
