Chemical vs standard glass fuses

"klem kedidelhopper"

( Polyswitch = a self re-setting, polymer based PTC device )

The term "chemical fuse" is a real stinker and vary rarely used by anyone.

.... Phil

one.

I was under the impression that a polyswitch was a self resettable device, sort of like a circuit breaker.Lenny

"klem kedidelhopper" "Phil Allison"

I was under the impression that a polyswitch was a self resettable device, sort of like a circuit breaker.

Are you asking about a Polyswitch or not ??

.... Phil

Chemical fuses like the 'Belfuse' series are coated with a chemical that burns when the fuse wire reaches a set temperature. They are very fast blow and a special class of fuse. I wouldn't recommend using a standard fuse, since you can cause major damage in the equipment before it blows.

What type of power supply are you working with in that unit? If it's a linear supply, can you substitute a variable voltage, and current limited power supply for testing?

it's

Its a SMPS with several different outputs. There is a feed back circuit I believe that would make it risky to try to sub in a supply. Thank you Michael for the information you provided. Sorry Phil that I blew right past your response however I guess I'd have to wonder if YOU read what I wrote. I thought that I was clearly asking about a Chemical or "pico" type fuse, not a polyswitch. Lenny

"klem kedidelhopper"

Sorry Phil that I blew right past your response however I guess I'd have to wonder if YOU read what I wrote. I thought that I was clearly asking about a Chemical or "pico" type fuse, not a polyswitch.

Did you invent it ?

A "Pico" fuse is simply a wire fuse in a package like a resistor.

.... Phil

You can certainly use a more standard fuse for a quick check.

Mark Z.