Difference between fuse micro such SG SCT T4AL 250 V and the usual ones

[abdulbadii]

What's the difference between fuse micro such SG SCT T4AL 250 V and the more common such glass fuse or fusible resistor which is less costly ?

 

[rjenkinsgb]

Those are time-delay slow fuses with quite high voltage and breaking capacity for the physical size.

https://picodenshi.com/wp-content/uploads/2015/01/SCT-Series.pdf

I'd guess they are intended for such as the inputs to small switch-mode PSUs, where they need to stand the initial capacitor charge current when power is connected, but still blow with a sustained low overload.

The price seems low! I've found those at $16.75 per hundred; checking prices for all time-delay fuses on Mouser, that puts them third cheapest out of all (near 3000) 250V AC rated ones.