The first part is a wire with a high melting point so that it will absorb surges, while still blowing fast on extreme overload. Everyday items at home or in the office use these products to function, it is important replacements are always to hand.

And do you think the power outage could do some damgae to the amplifier components even after blowing the fuse? Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page.A problem with this type of fuse is that occasional currents just above the rated value may cause some unwanted diffusion to occur, altering the fuse characteristics without visible change. In this case, at the lower temperature of the wire, the solder diffused into and alloyed with the silver to create a region of high resistance in the spot, which would glow red hot, with the wire rupturing next to it.

In slow blow fuse the wire is (generally) coiled to provide proximity to heat energy from the adjacent wire plus the cooling path is increased by having a much longer wire length and thus thermal path to the mounting points. If the fuse is in series with a transistorised power supply's pass transistor, then it needs to be a very fast blow. He found that a spot (the 'M' spot) of solder on a silver wire element did not affect the short circuit performance, but it did reduce the time to blow on a sustained lower current.I just repaired a pair of m-audio monitors which blew one of these fuses and it says to replace only with F2AL. I've seen it suggested by some sites only that slow blow use lower melting temperature materials - but this is not a certainty. If fast-blow is used instead of slow-blow, there will be no damage, but fuse consumption can increase, which is usually preferable to equipment damage.