I'm currently looking at buying a bunch of MTS 101 rocker switches which are rated for:

AC 125V 6A, AC 250V 3A

For DC the rating is not available


The selection was purely considered on "cool factor"

I read something about "arcing" of AC switches in DC circuits, but does this apply on such low voltage circuits as well? Can I buy and use this or should I really not bother with AC switches in DC circuits (even low powered ones)

The switch would be used to make an 'on/off' toggle for a small electrical device (a small Electric Piano Organ Module which runs on 5v) - uses 555 IC - 3x 0.1uF Electrolytic capacitor - 1x 4.7uF capacitor - 4ohm 2W speaker and a bunch of momentary switches and transistors to make sounds.

The other option is SS12D00 or something similar, but even though they work just fine, they look a bit dull in my opinion. But hey safety > cool factor?

Thanks in advance!

  • \$\begingroup\$ If it is just a hobby project it will be fine. Your correct there is a difference between how an AC vs DC switch is build, specifically to reduce arcing. Given your low power and voltages, I would expect this switch to be fine. Maybe you technically risk a reduced life but whatever. \$\endgroup\$ – MadHatter Jan 31 '19 at 21:55
  • \$\begingroup\$ It probably would work as said above but considering you can get many toggle switches cheaply on ebay, amazon, and other sites, I would recommend just buying ones that are rated for dc. \$\endgroup\$ – deathismyfriend Feb 1 '19 at 1:01
  • \$\begingroup\$ Alright thanks for the answers so far. I ordered a few dc switches just in case. If I were to make the solder connections to the AC switch and then use shrinking tubing to fully insulate the leads, would that help 'secure' against arcing? \$\endgroup\$ – iridian Feb 1 '19 at 10:52
  • \$\begingroup\$ No, the arc is internal as the contacts separate. Over 1000s of times, it wears the contacts. \$\endgroup\$ – MadHatter Feb 6 '19 at 13:57

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