The threat comes from people thinking it's on a 20 amp circuit and loading it as such. A 20 amp GFCI doesn't pose any threat just by being there. If you don't know what you are doing leave microwave ovens alone. First off, connecting a 20 Amp load to a 15 Amp circuit will overload the circuit but shouldn't cause a fire because the 15 Amp breaker will trip. It is more likely to be a loose connection or dry solder joint in the power supply path or even a dry joint solder connection on the control board. Can I replace a 15 ampere circuit breaker with a 20 ampere breaker (4 answers) Closed 8 months ago. If the fuse has not blown, unless the fuse is loose in the fuse holder it would be very unusual for it to cause intermittent power problems. The best way to determine what the correct value fuse should be is to look up the model number of your microwave and see what the manufacturer specifies. Has it failed? If so that means that there is a fault further into the circuit and the fuse is just doing its job, which is protecting the equipment from further damage and also the user by preventing electrocution or even a possible fire due to a fault condition.
(I assume that you mean the fuse in the microwave oven.) 2 EdBeal - assuming that its on 220V and uses the maximum current available, thats 8.8kW - my electric shower is rated at 8.5kW and produces a reasonable flow rate, albeit not amazing. The Miller site suggests using a 30 amp breaker, the plug itself has 20 Amp printed on it. So therefore a 15 Amp fuse should be more than capable of handling the current required before it fails. I have a 30 amp circuit breaker installed for my tank type hot water heater. If the breaker is tripping because its overloaded (say, drawing 25 amps on a 20-amp breaker), increasing the size may cause the wire or the receptacle to. 14 wire 15 Amp 12 20 A 10 30 A 8 40 A 6 50 A 4. (Formula I=P/V - this is only approximate, but to use as a guide is close enough) or 1200W microwave 230V AC power supply = approx. 1200W Microwave 120V AC power supply = approx. Depending on the maximum power used by the microwave and the voltage of your power supply roughly determines the current required.
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