Kijanki wrote,
"We don't even know if 3A Hi-Fi fuse is not really 3.5 or 4A standard fuse since AFAIK there is no test or approval of any agency."
Judging from the 4 pages of technical data on the Hi Fi Tuning web site, including data for directionality and cryogenically treated fuses, chances are good that Hi Fi Tuning testing is at least as comprehensive as UL or other standards orgs.
"We don't even know if 3A Hi-Fi fuse is not really 3.5 or 4A standard fuse since AFAIK there is no test or approval of any agency."
Judging from the 4 pages of technical data on the Hi Fi Tuning web site, including data for directionality and cryogenically treated fuses, chances are good that Hi Fi Tuning testing is at least as comprehensive as UL or other standards orgs.