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Novamatrix power on/off switch?

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BobA:

You do not use the same correlation of volts and amps in switch ratings as in power ratings.  For example a switch rated at 120 V and 10 amps CANNOT be used for 12V at 100 amps.  The switch will melt.   

This can be show by looking at the example of a single pole toggle switch with the following ratings.

Single pole toggle switches are rated: 10A/277V AC; 20A/125V AC; 21A/14V DC; 3/4 HP 125-250V AC

The DC rating in amps is very close at 125V ac and 14V dc.

I think that the ratings are related to the I squared R loss for the contact resistance of the particular switch.

bfauska:

Good to know, and thanks for pointing that out.  Not that I had much intention of using a switch that way, but it's good to know.

genesim:

Shouldn't it be the difference between continuous or not?   I just remember using a specific switch that may not work like the first picture.

Though it is cool to put it all through a separate power supply.  Lots of wire to work with.

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