Help identifying a varistor from a fluorescent light tube ballast
It seems like it's not a varistor even though it looks like one. It was actually the PPTC polyswitch, as when I carried out the continuity test on a good ballast, it gave a beep and the resistance measure without the PCB is around 1 Ohm which is unusual for a varistor. When I connect it to the Power supply, it begin to trip around 0.1A and heating up, once it cools down, it able to work again. So, it is a resettable fuse.
http://www.jdtfuse.com/product/product110_en.html
Found the similar specs on the link, so I think it should be ok.