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Can I use a 12vdc switch rated at 16A on a 120vac that only use 0.5A-1A? I have a similar switch, that is 120v rated at 10A, but it's a little too small. doesn't fix.

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    \$\begingroup\$ Current and voltage are not to be traded against each other. \$\endgroup\$ – Andy aka Aug 20 '15 at 7:46
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No.

The insulation in the 12V switch is not designed to withstand 120V (really 170V).

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  • \$\begingroup\$ I have tested the 12v switch on a 115 psu, and see no problem. \$\endgroup\$ – Atmega 328 Aug 20 '15 at 9:58
  • \$\begingroup\$ @Atmega328 then why did you ask the question? \$\endgroup\$ – Sam Aug 20 '15 at 14:59
  • \$\begingroup\$ I don't have other switch, and I need to use that switch. I asked to make sure it's safe. \$\endgroup\$ – Atmega 328 Aug 20 '15 at 16:27
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    \$\begingroup\$ @Atmega328, its not safe, it will probably work for a while but is likely to eventually do one of the following: fuse open, fuse closed, spark, start a fire. \$\endgroup\$ – Sam Aug 20 '15 at 16:42
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    \$\begingroup\$ Do you have an AC rating for the switch? AC and DC ratings can be hugely different, so your switch may be ok, but still risky unless you check. \$\endgroup\$ – F. Bloggs Aug 21 '15 at 17:59
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No. You can't use that switch. The switch would heat up a lot and sometimes can cause an electric shock if you touch it. This is because the insulation would be provided for the specified voltage and current.

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  • \$\begingroup\$ Heat has almost nothing to do with it, no I take that back, it has nothing to do with it. \$\endgroup\$ – Sam Aug 23 '15 at 2:01

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