How to pick the correct rated Fuse to protect my Arduino project

[pete1111]

Hi,
just wanted to ask for some help please 

i have an arduino project that i have painstakingly made a PCB  design in Eagle and i was wondering i should probably protect it with a fuse.

my project consists of an arduino pro micro (SparkFun Version) running on 5v (from a pc ATX power supply)
it is connected to a 20x4 LCD (Backlit) and it simply displays 4 temperature readings from 4, TMP36 sensors.
there is a 3mm blue led also connected to the arduino.

i was thinking on using this Fuse ?
resettable 1812 msmd050-15v  500ma 15v auto recovery fuse pptc a6

I have a crappy M-830B multimeter

[danadak]

Whats the sum total of all worst case component current ?


Regards, Dana.