Hi nairepooc,

It would be best to start a new thread on your build. Also, I wouldn't consider myself an electrical expert, I got through my build after many wrong turns and used the advice of fellow forum members.

I haven't use the Pilz myself, but it is purpose built and used commercially and is well known. Instead I was happy with a standard relay to run all the 24V signal control hooked up to the e-stop circuit and wiring it up manually to create the latch circuit. If I remember your schematic that is what you had done so a Pilz unit is not critical.

This relay in turn drives the 'Allen Bradley' unit. This is a contactor and is a purpose built relay (with lots of features as m_c posted on recently). It uses 24V DC to switch 240V AC. When the control box is turned on you have to press the reset button to latch the 24V circuit. This then sends 24V DC to the contactor signal terminals, which in turn switch the mains (L) and (N) feed to the linear power supply. This in turn powers all the drivers at about 70V DC.

As has been pointed out by others, you could use a normal relay instead to switch the mains so long as it can take the current. I have a linear PSU with high in-rush current so didn't want to go that route. Maybe SMPS is lower in-rush and would be OK - but I'm not an expert.

I had to size my MCBs with some trial and error, and forum advice, to meet my particular needs. You will have to decide if 4A and 10A are what you need in your case, or ask for further advice on those.