ZyXEL Communications 5 Series User Manual

ZyWALL 5/35/70 Series User’s Guide

This appendix shows you how to remove and install fuses for the ZyWALL.

If you need to install a new fuse, follow the procedure below.

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If you use a fuse other than the included fuses, make sure it matches the fuse 
specifications in the product specifications chapter.

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Disconnect all power from the ZyWALL before you begin this procedure.

1 Place the rear panel of the ZyWALL in front of you.
2 Remove the power cord from the back of the unit.
3 The fuse housing is located between the power switch and the power port. Use a small 

flat-head screwdriver to carefully pry out the fuse housing.

4 A burnt-out fuse is blackened, darkened or cloudy inside its glass casing. A working fuse 

has a completely clear glass casing. Pull gently, but firmly, to remove the burnt out fuse 
from the fuse housing. Dispose of the burnt-out fuse.

1 The ZyWALL is shipped from the factory with one spare fuse included in a box-like 

section of the fuse housing. Push the middle part of the box-like section to access the 
spare fuse. Put another spare fuse in its place in order to always have one on hand.

2 Push the replacement fuse into the fuse housing until you hear a click. 
3 Firmly, but gently, push the fuse housing back into the ZyWALL until you hear a click.
4 Plug the power cord back into the unit.