micky wrote:



I thought all ceramic fuses were slo-blo, but this one is embossed
F12H250 and some webpages say that F means fast-blow????


** Ceramic fuses come in all types, fast, medium and slo- blow as well as HRC.

HRC = High Rupture Current and are found in some uW ovens.



Nothing I read decribes why a microwave should need ceramic or slow-blo
(in the power part, not the high voltage part).



** Ceramic fuses are specified as they do not shatter when heavily overloaded.
Slow blow is needed to cope with inrush surges from the transformer, if there is one.


" If a high voltage comes down the electrical line, the fuse element
will melt.


** Absurd.


From before
According to the label on the back "The input is 1400 watts, but it's a
220 volt device, so that's less than 7amps normally. So, 10, right?
Unless F12 in F12H250 at the top means 12 amps? " And the home.repair
people told me it did, but the web says F means fast-blow.


** Single plated wire "F? fuses are in fact rather slow and tolerate brief surges of say 5 times their rating.



..... Phil