David Cutter wrote: > >I would use a current-limited power supply to connect up ANY equipment >for the first time. No fuse is as fast as electronic limiting. > >Even the fastest semiconductor fuses require a huge overload to achieve >a sluggish response. Busman 25A fuse: 340A^2t. I'm not an expert, but >divide 340 by the time you want it break and then take the square root, >I think that's how it's done. So, to blow in 100ms it takes 58A. >Someone put me right. UK 13A plug fuses need 2.1 x 13A to guarantee to >blow in 30seconds! >
The other important point is that fuses provide ZERO protection until AFTER they have blown. In the life and death of a semiconductor, even a few milliseconds is a very long time indeed. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
