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S&C Instruction Sheet 466-500    21

Troubleshooting

 WARNING

Stay at least 5 feet (152 cm) below the VacuFuse II 
interrupter when operating the Loadbuster tool from 
a bucket truck . Operating the Loadbuster tool from 
less than 5 feet away is difficult and may result in an 
improper opening operation, leading to arcing, faults, 
equipment damage, serious injury, or death .

Follow these steps when using S&C’s Loadbuster tool:

STEP  1.  

Check for proper resetting of the Loadbuster 
tool by extending the tool about 3 inches 

 

(76 mm) by hand. Throughout this travel, an 
increasing spring resistance should be felt.

STEP  2.  

Fasten the Loadbuster tool to an S&C Universal 
Pole not less than 6 feet (183 cm) long (8 feet  
[244 cm] for catalog number 5400R3) with the 
frame of the tool in line with the pole. As shown 
in Figures 14 and 15, the Loadbuster tool must be 
attached so it reaches across the front of the 
VacuFuse II Self-Resetting Interrupter, and the 
Loadbuster tool’s anchor must be hooked to the 
attachment hook on the far side of the 

 

VacuFuse II interrupter. 

The Loadbuster tool should never be attached 

with its anchor hooked on the closest side 
of the VacuFuse II interrupter, as shown in 
Figures 16 and 17 on page 22. Attaching the 
tool in this manner will not only obscure the 
operator’s line of vision, but it could also result 
in bending stress on the tool, causing improper 
disengagement.

Figure 14. A correct fastening approach. 

Figure 15. A correct fastening approach. 

Summary of Contents for VacuFuse II

Page 1: ...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 in...

Page 2: ...alified persons They are not intended to be a substitute for adequate training and experience in safety procedures for this type of equipment Read this Instruction Sheet NOTICE Thoroughly and carefull...

Page 3: ...nsformers up to 150 kVA and on 15 kV transformers up to 250 kVA when mounted in a 110 or 125 150 kV BIL cutout mounting To ensure proper performance VacuFuse II interrupters must only be installed in...

Page 4: ...p out in response to a fault Warranty The warranty and or obligations described in S C s Price Sheet 150 Standard Conditions of Sale Immediate Purchasers in the United States or Price Sheet 153 Standa...

Page 5: ...rtant procedures or requirements that can result in product or property damage if instructions are not followed Following Safety Instructions If you do not understand any portion of this instruction s...

Page 6: ...e Description Part Number A WARNING A VacuFuse II Self Resetting Interrupter must be dropped out from the cutout mounting to be considered OPEN and de energized Device may be energized from either sid...

Page 7: ...remove or obscure any of the DANGER WARNING CAUTION or NOTICE labels and tags Remove tags ONLY if instructed to do so 5 ENERGIZED COMPONENTS Always consider all parts live until de energized tested a...

Page 8: ...ardware for securing the VacuFuse II Self Resetting Interrupter to the pole Handling NOTICE DO NOT DROP the VacuFuse II Self Resetting Interrupter or subject any of its parts to undue stress during in...

Page 9: ...h the parts of the VacuFuse II Self Resetting Interrupter See Figure 3 Figure 3 An overview of the VacuFuse II Self Resetting Interrupter POSITION indicator CHARGING LED OPEN CLOSE lever Hinge end con...

Page 10: ...into a damaged cutout mounting If installing in a new S C Cutout Mounting For overhead pole top style VacuFuse II Self Resetting Interrupters attach the mounting to its mounting bracket as illus trat...

Page 11: ...on on page 15 for more information Place the OPEN CLOSE lever in the correct position for the closing sequence desired See the Understanding the Closing Sequence section on page 12 STEP 2 Stand firmly...

Page 12: ...ays to close the vacuum interrupter Option 1 Automatic Delay Close Place the OPEN CLOSE lever into the Closed up position at any time before or after mounting the unit into the cutout mounting When cl...

Page 13: ...the POSITION indicator will show a green target If the over current event persists after the reclosing event the unit will lock out and drop out from the cutout mounting Follow these steps if the Vacu...

Page 14: ...s out If required by utilitypractice followthestepsinthe Removing the VacuFuse II Interrupter from the Cutout Mounting section starting on page 18 This creates a visible open gap showing the transform...

Page 15: ...rupter to power the control from its Sleep state When powered the control will remain powered if the transformer primary current does not fall below 3 5 amperes If less than 3 5 amperes of primary cur...

Page 16: ...use II Interrupter WARNING The VacuFuse II Self Resetting Interrupter is designed to protect distribution transformers from internal and external fault current A VacuFuse II interrupter found in the O...

Page 17: ...pter will trip open independently of any force still applied to OPEN CLOSE lever To Reset the OPEN CLOSE Lever Af ter Manually Closing into Fault Current When the VacuFuse II interrupter trips in resp...

Page 18: ...r displays a green target STEP 2 Wait one minute until the VacuFuse II Self Resetting Interrupter drops out If the VacuFuse II Self Resetting Interrupter stays in its cutout mounting confirm the POSIT...

Page 19: ...its cutout mounting using Loadbuster The S C Loadbreak Tool Then re install the VacuFuse II interrupter as described in the Installation section starting on page 9 If there is no voltage present in t...

Page 20: ...utout position A swift firm pull will be required Situation 3 The VacuFuse II Self Resetting Interrupter is stuck in the cutout mounting in Abnormal mode Situation 3 Action Check for voltage presence...

Page 21: ...tool to an S C Universal Pole not less than 6 feet 183 cm long 8 feet 244 cm for catalog number 5400R3 with the frame of the tool in line with the pole As shown inFigures14and15 theLoadbustertoolmust...

Page 22: ...ended to its maximum length A downward pull to open the VacuFuse II Self Resetting Interrupter extends the Loadbuster tool and charges the tool s internal spring At a predetermined point in the openin...

Page 23: ...isting the pole after the Loadbuster tool has been tripped and fully extended To perform this operation smoothly always roll the Loadbuster tool so that it rotates in an upward direction STEP 7 To res...

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