January 24, 2022
© S&C Electric Company 2022, all rights reserved
Instruction Sheet 466-500
VacuFuse
®
II Self-Resetting Interrupter
Outdoor Distribution (7.2 kV through 15 kV)
For Overhead Distribution Transformer
Protection
Installation
Table of Contents
Section Page
Section Page
Introduction
Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . 2
Retain this Instruction Sheet . . . . . . . . . . . . . . . . . . . 2
Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Operating Considerations . . . . . . . . . . . . . . . . . . . . . 4
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Information
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
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Returning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation
Before Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installing a VacuFuse II Interrupter into the
Cutout Mounting . . . . . . . . . . . . . . . . . . . . . . . . . .10
Closing the VacuFuse II Interrupter into the
Cutout Mounting . . . . . . . . . . . . . . . . . . . . . . . . . .11
Understanding the Closing Sequence . . . . . . . . . . .12
Operation
If the VacuFuse II Self-Resetting Interrupter
Is Found Open . . . . . . . . . . . . . . . . . . . . . . . . . . .13
If Maintenance Is to Be Performed on the
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Understanding the LED Indicators and
POSITION Indicator . . . . . . . . . . . . . . . . . . . . . . .15
Opening and Closing the VacuFuse II Interrupter . . .16
Removing the VacuFuse II Interrupter
from the Cutout Mounting . . . . . . . . . . . . . . . . . . .18
Troubleshooting
Removing the VacuFuse II Interrupter
from the Cutout Mounting Using
Loadbuster®—The S&C Loadbreak Tool . . . . . 20
