SPDT switch > 20A @ 32VDC?
I'm seeing SPDT toggles that are 20A at 125VAC Ebay 20A 125VACand some that are simultaneously rated to 21A at 14VDC DelCity 20A 125VAC But I want to switch a max of ~700W at ~30A, so maybe 23A? ...
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I think maybe you'd be well served to look into solid state relays for this sort of thing.
An example (that looks potentially suitable--no idea if this is the best brand or price out there).
Trying to increase the current capability of a switch by paralleling contacts is probably not a good idea. It's reasonable to expect that one of the contacts would generally switch a fraction of a second before the other, and so the slower switching one would end up breaking the full current anyhow. (It is also not recommended to assume that AC ratings are appropriate as DC ratings, particularly at higher voltage and current levels, as you apparently are already aware. Breaking high DC currents is a lot harder on a switch than breaking the same AC currents since with a DC load there are no momentary zero current crossings where any arc that may have started will break itself down.)
An example (that looks potentially suitable--no idea if this is the best brand or price out there).
Trying to increase the current capability of a switch by paralleling contacts is probably not a good idea. It's reasonable to expect that one of the contacts would generally switch a fraction of a second before the other, and so the slower switching one would end up breaking the full current anyhow. (It is also not recommended to assume that AC ratings are appropriate as DC ratings, particularly at higher voltage and current levels, as you apparently are already aware. Breaking high DC currents is a lot harder on a switch than breaking the same AC currents since with a DC load there are no momentary zero current crossings where any arc that may have started will break itself down.)
