What I am unclear on is the placement of the snubber across the solenoid coil vs. across the contacts of the relay that switches it. I see a lot of diagrams where the snubber is across the coil, not the switch/relay contacts.
In my application , the 'delicate' stuff is also connected on the unswitched line, physically close to the solenoid:
and the relay is physically quite far from the solenoid. Will having the snubber across the relay still protect the 'stuff'?
Also, I'm still unclear on how to estimate the capacitor values. Many diagrams show 0.1 uF, but KE7GKP recommends 0.01 uF. Is that a function of the voltage, or is it not very important?