Cheaper to run a polyfuse...why bother asking???
Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Mon, Mar 21, 2016 at 4:01 PM, Chuck McCown <[email protected]> wrote: > Still leaning toward the polyfuse. Not a lot of room, fuses and fuse > holders are more money. > > *From:* Bill Prince <[email protected]> > *Sent:* Monday, March 21, 2016 1:51 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Fuse question > > Most of ours are now the DIN-mounted double feed that uses the 5x20mm > glass fuses. However, we also have a few legacy sites that use the > automotive blade fuses. > > If something new came along, we would use what it uses. > > bp > <part15sbs{at}gmail{dot}com> > > > On 3/21/2016 12:47 PM, Josh Luthman wrote: > > We already stock 5x20mm fuses so keeping with the same form factor would > be nice. Anyone else using those same DIN clip fuse holders have the same. > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > On Mon, Mar 21, 2016 at 3:40 PM, Adam Moffett <[email protected]> wrote: > >> I have no strong opinions sir, but if it's a replaceable fuse I do like >> the automotive blades because every gas station has them. >> >> >> On 3/21/2016 2:42 PM, Chuck McCown wrote: >> >> I am considering adding a fuse to a new version of my rack mount POE >> surge suppressors. >> >> I know many of you like PTC resettable solid state fuses. I don’t >> recall ever designing one in to anything. >> Maybe I did on a phone device years ago, but that would have been to >> satisfy a regulatory agency only. >> >> Studying up on them I learn that if you have a 1 amp “hold current” the >> “always trip” current is 2 amps. >> Not like a fuse, which is pretty well guaranteed to trip at any current >> over the rating if you wait long enough. >> >> For a polyfuse, if your load is one amp, you have to have a design value >> of greater than 1 amp hold current. >> But then it takes double that to actually trip.. >> >> And then there is leakage current required to keep it in the tripped >> condition. >> It does not totally break the circuit. >> >> They are fairly inexpensive compared to glass fuses and fuse holders. >> Could do auto blade fuses too. >> >> Not sure I have the room for anything but a polyfuse though. >> >> Anyone have strong opinions about this? >> >> >> > > >
