What gthack said. Note that forum rules don’t allow discussion of 3rd party equipment fuses:
Modification extends to the use of 3rd party or home-made power supplies and any cabling that carries DC power between Naim equipment.
This rule applies especially to the case fuses fitted within our equipment. There is a blanket and strict ban on such topics and it includes euphemistic phrases that ultimately reference such practices and attempt to circumvent the restriction.
For more about fuses see the fuse FAQ