The North American "curves" are @ 110%, essentially continuous operation (last I saw, there was a minimum finite time factor involved, but I don't remember what it is)
@ 135%, must open within 60 minutes @ 200%, must open within 120 seconds So, for a 5A rated fuse, 5.5A must be carried continuously 6.75A must cause the fuse to open within 60 minutes 10A must cause the fuse to open within 120 seconds I don't know where your 8A for 90 minutes comes from, unless the UL198 Series of standards has been revised while I wasn't looking. Unless, of course, you're talking about performance of a specific fuse. Such a fuse would at best be accepted by UL as a Recognized Component and by CSA similarly, with limitations on its use and application. Regards, Peter L. Tarver Nortel [email protected] >---------- >From: George Stults[SMTP:[email protected]] >Sent: Monday, October 27, 1997 2:17 PM > >Greetings, > >In an recent conversation I was suprised to learn that a 5AMP fuse >could last as much as 1 hour (1-1/2 hours?) at 8AMPS per the North >American Curve (for power dissapation?). > >Is this correct? What about Europe? >Thanks in advance for any comments. > >Regards >George Stults >Cellular Techinical Services >(new EMI/EMC/Safetey draftee) >
