Thanks guys. Yes, I use the 5.08mm SPOX connectors on my own (lower voltage) builds, as I detest the screw down connectors for my own use.
I'll need to take a closer look at these, but Molex makes a Micro-Fit 3.0 series, which is 3mm pitch, and rated for 600V apparently. 3 pin PN: 43650-0315. Might be something to plan for on PCB designs if they actually work out to their ratings. I have some of them for some Salas shunts for a UGS preamp project.