mamech
Full Member level 3
hello
I understood something about the difference between the varistors and ptc, and I want to be sure that what i understood is correct.
I know that ptc is for protection against current surge, while varistors are for protection against voltage surge.
most ptc types that exist are low in its current ratings, while varistors are high in their voltage ratings.
varistors are used in high voltage side (sometimes with fuse) , so if overvoltage happens, it protects the circuitry before that this overvoltage causes an overcurrent (i.e, it makes a short circuit path across it, so it makes the fuse to be blown to protect the circuit)
ptcs, are used in low voltage side, and when over current happens, they make the circuit to be open, and after a short time, they return back to normal operation (they are a kind of auto resettable fuses)
my questions now:
1- are there any corrections for what I said?
2- can ptcs be used in low voltage side, and the varasitors with fuse in high voltage side for better protection??
I understood something about the difference between the varistors and ptc, and I want to be sure that what i understood is correct.
I know that ptc is for protection against current surge, while varistors are for protection against voltage surge.
most ptc types that exist are low in its current ratings, while varistors are high in their voltage ratings.
varistors are used in high voltage side (sometimes with fuse) , so if overvoltage happens, it protects the circuitry before that this overvoltage causes an overcurrent (i.e, it makes a short circuit path across it, so it makes the fuse to be blown to protect the circuit)
ptcs, are used in low voltage side, and when over current happens, they make the circuit to be open, and after a short time, they return back to normal operation (they are a kind of auto resettable fuses)
my questions now:
1- are there any corrections for what I said?
2- can ptcs be used in low voltage side, and the varasitors with fuse in high voltage side for better protection??