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My Eureka vacuum 12 amp 120 volt AC switch melted and I found an almost identical 10 amp 12 volt DC one at an Auto (Place) parts store (except for the LED light). Why are the current ratings different for the same size switch especially when the DC one warned that it was a light duty switch not to exceed the current rating?!!!

These two really don’t compare. The reason that they are different is inside not outside the switch. The Contacts on the AC switch will be much larger than those on the DC switch in this case. As will everything else inside the switch.

There is a relation between volts/amps/watts basically in DC circuit the wattage is Volts times Amps so VxA=W or with the 10amp 12volt switch 120watts.. With the AC switch a power factor has be to used and the formula changes slightly but the default power factor is usually 60% so the formula would be The conversion of Amps to VA is governed by the equation VA = Amps ยท Volts/PF

For example 1 amp * 110 volts/0.6 = 183 VA or in your case
12 * 120/0.6=2400 VA (or watts if you will)

So if you use the DC switch as a replacement, it will be dead as soon as you turn it on. The probable reason your switch melted is the motor pulled more current for some reason, It may need to be cleaned or the brushes replaced or the bearings replaced etc.

Hope that helps

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