Have you considered any of the common VCBs (Vacuum Circuit Breaker) ? This is exactly what they are designed to do.
There are several global suppliers of VCBs who offer devices with a wide range of voltages and currents.
If you need an alternative solution, then I'm sure you can buy a used (scrap) VCB or Air-blast CB from some expired power station, engineerng production factory or railway locomotive; they have been very common in industry, and so are now very common in metal scrapyards.