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fuses do not have voltage ratings they are a current device. the 15 V does not make sense. It might be 15 A which is the current rating. A standing for Ampere which is the maximum current named after the discoverer of current creating magnetic fields being Andr?-Marie Amp?re in 1826. The 120v or 240v relates to the transformer design in the microwave. The transformer would be design to run on 240V AC 50 HZ AC like in Oz and UK or 120V 60 Hhz AC like used in the USA out of the power point from the power company.
Also the current relates to the voltage. So voltage divided by circuit resistance equals current.denoted by the formula I = V/R
I realize this is an old question, but if anyone else has the same query, from page 6 of the manual listed below, the fuse holder is located on the back panel between the power on switch and power socket. For use on 120v supply, 5 amp/250v. For use on 240v, 2.5 amp/250v.
If you are only getting 120v to the dryer, you still have a breaker tripped. It should be right next to the single pole 30. It takes 2 breakers to get the 240v you need to run the dryer. Try resetting another breaker expecially the ones marked 30amp. You do need to get a double pole breaker installed even for safety reasons.
I'll hazard a guess that you are trying to run these things off of a single household electrical circuit and want to avoid an overload. In that case, the best way is to determine how many Watts each device uses. That information can either be found on the back/bottom of the unit, or on the AC adaptor that came with it. In the latter case, use the "input power" value.
Once you know the wattage, divide by the input voltage - 120 Volts in the US, 100 Volts in Japan, or 240 Volts in Europe, Australia, and much of Asia.
For example...the info on the bottom of my boombox indicates 120V at 16W...
Watts / Volts = Amps
18W / 120V = 0.15A
In another example, my laptop power supply has the following info...
120V-240V @ 160W input
15.4V @ 145W output
I use 120 Volts here so the math goes...
160W / 120V = 1.333A
Note that the output values are not used.
If I want to know how much current the devices use together, I merely add them...
Well it may be compatible but it should hav a switch on the rear side to choose either 110 or 240V.Check for this but you probably burned primary side of main transformator and you'll have to replace it or to find somebody who is able to fix it