Finally got some time to reply! Apologies, I was on a shoot yesterday and have a funeral today so things have been a little hectic.

I've re-read this whole thread and understand things a little better. My original intention here was to have two separate MCBs due to the very different capabilities of my drivers. One would be for the two large drivers and one for the PSU + 4 small drivers.

That said, while my steppers motors are quite different, the drivers are going to be set at:

- around 3 amps for the big steppers. Not sure of the voltage, can't see where to find this on the big drivers
- and 1.36 amps (42.5 Volts) for the smaller ones.

Therefore, given the power required for each won't be that different, it doesn't make sense to have separate MCBs. Rather, I should (or could) just have one to protect the whole system against cables setting on fire.

As I plan to one day have all 8 axis being used, I think I'll go for one 10A MCB. This is the one I'm thinking:

https://uk.rs-online.com/web/p/mcbs/8255633/

That all sound good or am I still getting this wrong?

FYI, these are the internal cables I'll be using:

Power - https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1
Signal - https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1