What are the design criteria basis to decide the fuse ratings of 110 VAC and 110 VDC solenoid operated valves? How does one decide what rating fuse is to be used in Solenoid Operated valves? Is there any thumb rule or formula to calculate the fuse ratings?

 

It depends on why you are putting the fuse there in the first place. Most times its either for isolation or to prevent a single shorted solenoid from taking out an upstream circuit protection device that also prvides power to other things.

I usually use a slow blow fuse, typically 1 amp (just cause thats as good as anything else). For larger solenoid valves that might take more than 1 amp, I do 125% of FLA on the solenoid.

Be sure the fuse you select will blow on an overload before the upstream device does.

 

Very simple - the fuse does not protect the solenoid or whatever load is connected - the fuse protects the wiring.

Meir