Meh just replace the card if it's being troublesome. Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Mar 21, 2016 4:05 PM, "Chuck McCown" <[email protected]> wrote:
> Well, they have their downside. > A real fuse will be easier to notice when it is blown. > A poly fuse just cuts the current way down. > More of a troubleshooting issue than anything else. > > But, if a fuse is blown, then you have to fix the circuit and find a > replacement fuse. > I do have LEDs and by unplugging the short circuit cable the LED should > come back to full brightness. > > Just thinking out loud here. Want to make the right choice. > > *From:* Josh Luthman <[email protected]> > *Sent:* Monday, March 21, 2016 2:02 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Fuse question > > 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? >>> >>> >>> >> >> >> >
