Breaking a DC current or an HF AC current?

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cupoftea

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Hi,
We all know breaking a DC current from a HV source is bad news...the HV will likely keep the current flowing by arcing somehow......however, with AC its not so bad...the AC current goes through zero regularly, of its own accord, and so any arc cannot sustain.....but what if its High frequency AC?.....can the current still sustain?, since the current soon rises up quickly again following the zero cross.....eg, what about breaking the attached AC current which is 58kHz?

Will there be a sustained arc?
 

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What is the backing voltage? Any contact protection caps /
snubbers? Automotive relays interrupt DC currents of this
order all the time, but at low voltage.
 
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There is the problem that the air gap starts at zero, and
at some voltages (more than residential, less than
substation) you end up needing things like oil or air-jet
arc snuffers to make a clean break.

So declare your backing voltage.
 
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