CSLAB CSMIO/IP-M 4-axis Ethernet Motion Controller

[JAZZCNC]

Q#1: Well yes because it's just a relay, all be it expensive one and how you use that relay in your safety system is up to you.
Now to be honest the manual does say that what they show is just a minimum of safety and to me what they show I wouldn't use because it shuts every thing down including the controller which isn't required.
In E-stop situation you really only need to shut down the main PSU and drives along with anything else that can hurt you or cause damage.

#2 Yes 13A will easily handle everything you throw at the machine.

#3 Depends on your incoming supply really. If it's dirty line then yes would be worth it. Do I fit them.? NO. Generaly only if I have problems which I rarely do.

#4 Yes the VFD and the Main PSU along with any other high current devices are best run thru Contactors. They are just relays with contacts more suited to high loads. ( On Clives quite correct request I'll make clear Contactors break both sides of the contact, Std relays only break one side but still they work just like relay. Often they also have Aux set of low current contacts for signal purposes)

Normal relay contacts can and do burn out from high surge currents which devices like VFD and Toroidal transformers pull on startup.
In practise you'll have your master safety Relay turn these on using a low voltage.