Quoted from robertmee:What's the time/current curve look like for them? I'm betting they couldn't be used in fast-blo situations, but how do they compare to a slo-blow fuse?
Unfortunately, their specs are all over the place. Polyfuses have a horrible tolerance when compared to quality fuses and polyfuses have low voltage ratings (although you can now buy much higher voltage rated parts). Due to tolerances, I don't use them on my boards. BUT -- for test purposes, they should be fine.