User manual

Chapter 5: Installation and Wiring
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Hardware User Manual, 4th Edition, Rev. B
Fuse Protection
Some of the Input and Output I/O module circuits do not have internal fuses. In order to
protect your modules, we suggest you add external fuses to your I/O wiring. A fast-blow fuse
with a lower current rating than the I/O bank’s common current rating can be wired to each
common. Or, a fuse with a rating of slightly less than the maximum current per output point
can be added to each output. Refer to the I/O module specifications in Chapter 2 to find the
maximum current per output point or per output common. Adding the external fuse does not
guarantee the prevention of PAC damage, but it will provide added protection.