One pin AC connector (Coaxial)

[sophiecentaur]

I expect that the amperage would not be that high?

It would be a 50Ω system for RF use.

 

[sophiecentaur]

you need to consider arcing (welding kind/intensity) by default, since there are no 'zero crossings',

There are so many solid state devices that can cope with that problem, these days. Detecting an arc and tailoring the on/off transition is doable with fast responses and high current capability. there is much less risk of roasting contacts.