Recommended 4 pin plug/socket type etc

[Neale]

When you say that you used them on your router, do you mean for the power???

I use them to connect stepper drivers to the steppers. I'm also using NEMA23, 3Nm, running at about 4A (from memory), from an analogue driver running at a nominal 68V. Taking a quick random sample from one supplier, their XLR 4-way connectors are rated at 7.5A per contact. There is a voltage rating as well, but typically those are only relevant for making/breaking connections under power. Do that with a stepper driver, and the rating of the connector will be the least of your worries. Stepper drivers - they don't like it up 'em... It's why I prefer to use latching connectors.

I'm currently building my second router. The first one is MDF. That's why the second one is welded steel! You can learn a lot from even a simple, under-powered, wobbly machine like mine. Good luck with yours.