Than you guys for your input !... maybe it would be better to describe this in detail :-).
When i was using old board ( just wires ) i have used ready made 2 relay board with optocoupler and at that moment we didnt know why the system crashes every time relay triggers.
We finally checked power consumption of end device and then find out that he uses 40W !
I was calculating that it should be around 15W but we didnt have any datasheet, so...
The problem remain until we have separate power lines of relay and arduino.
After that we switched to mosfet but i would like to add OC and diode to this so i can be sure that nothing will happen in the future..
Btw. i have used Eaglein past, but before few days i switched to kiCad. What lib do you use for mosfets or, what program are you guys using for schematic design ?
Ok, sounds like you're trying to prevent a problem that you don't yet understand, and I would suggest in that case to go back one step and nail down the cause of your crashes before designing a new version of the circuit. For all we know you're still dealing with undefined parameters and hence a good chance of disappointment.