On 7/21/2021 10:49 PM, Rick NK7I wrote:
25 amp fusing isn’t a lot over overhead for a K3 with KRX3, KIO3a, P3 with the SVGA board and the PR6-10 preamp in play.
A study of fuse (and breaker) specs is worthwhile. In general, fuses are rated by average current, with considerable allowance for spikes and surges above that. A standard fuse (not a Slo-Blo) will not blow on spikes 25% higher than it's nominal rating, and fuses have time responses. We want fuses and breakers to pop when something breaks, not when there's an unusual spike that doesn't persist.
My most personal experience with fuses blowing on my gear has been with TenTec Titans that I ran for years. Generally quite reliable, but mains fuses would blow on crap on the AC line, not on equipment failure, which is what they are intended to prevent. Both sides of the line are fused, and if equal ratings, both will blow. I soon realized that a 20A fuse on one side and 30A on the other was a very good idea.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
