without doing more investigating , seen a video that stated the unit runs at about 30 watts. in my study guide for my tech ticket , going sat. for exam here in KY. I noticed a ...P-I-E ... circle , to help in calculating the different answers , were P is power in watts, E = voltage dividing to get I = amperes . called it 130 VAC / 30 =4.34 or so... and ya I did work out that same rated fuse. I will post some pics in the other forum to update this S120. thanks