I’ve been thinking, my Hegel H30 uses a 15 amp slo-blo so theoretically if on a 15 amp outlet, the breaker will trip and don’t need a fuse ... just hard wired it. But since it’s on a 20 amp line, MAYBE not a good idea. I’m just speculating and not bypassing the fuse.I think you’re right to not count on the 20 amp breaker providing protection comparable to a 15 amp fuse, Kng, and I would say the same thing even if the breaker and outlet you are using were rated at 15 amps. A circuit breaker will generally take MUCH longer to trip than a slow blow fuse, at least in situations in which the overload is not extremely great.
Regards,
-- Al