The Tesla coil Soft Start Safety Box project has been finished. The first version of my soft start box for 3 phased 400 VAC loads was just that, a soft start box. I wanted to include safety features like fault detection and emergency stop, but I also wanted to remain galvanically isolated from the mains supply, as it is the case with the interrupters and controllers that used a fiber optical link.
You can read all documentation, see pictures and schematics at this link.