Is not much of a project. I bought this fiber laser (I also have a CO2 laser and CNC router) and quite quickly realized that I need to find a way to automate the focus problem (which appear mostly when you change the lenses - every lens has a different focus - distance between part to be engraved and lens). After I found a device which do that (has a sensor for measuring distance) I realized I need to find a way to use the original software (which requires a homing procedure at start up) and the new device. I was told I cant use both and initially I was thinking to use 2 stepper drivers with the same motor. I took the advice give by some members (more experienced than me) to use the same driver with the same motor with a 4 pole relay (never worked with relays). All I need to do is hook up a relay with a 12V power supply (which is already there). Simple, but what kind of relay. I was asking that because I was thinking to make a PCB for all of this. With the relay and step/dir on the same board. That was my project. Nothing related with mains. I have some experience with electric and electronic devices, but all is at newbie level. I build a CNC controller and run into trouble with spindle and VFD noise. Dean (Jazz) was kind and helped me to understand the importance of star connection. All is working now, safely for over 2 years.
I asked some stupid questions, I know that, but to receive this kind of answer is harsh and I learn my lessons, not to ask anymore.
When the relay will show up I will connect everything with some led's first ofr proof and after that everything will be moved inside the fiber enclosure.

Thank you for your help