---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 03/05/09: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:14 PM - Re: Polyfuses (marcausman) 2. 12:46 PM - Re: Re: Polyfuses (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 12:14:23 PM PST US Subject: AeroElectric-List: Re: Polyfuses From: "marcausman" Technically there's nothing wrong with polyfuses. But I am not a fan of using them in an aviation application because you cannot control them directly like you can an electronic (solid state) circuit breaker or old-style circuit breaker. At least when a fuse blows the circuit stays off. -------- Marc Ausman http://www.verticalpower.com RV-7 IO-390 Flying Read this topic online here: http://forums.matronics.com/viewtopic.php?p=233378#233378 ________________________________ Message 2 _____________________________________ Time: 12:46:41 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Polyfuses At 02:12 PM 3/5/2009, you wrote: > >Technically there's nothing wrong with polyfuses. But I am not a fan >of using them in an aviation application because you cannot control >them directly like you can an electronic (solid state) circuit >breaker or old-style circuit breaker. At least when a fuse blows the >circuit stays off. Sure. We (the TC guys) never had an arugment with the ability of the polyfuse to perform as advertised. Our problem was delivering to traditional design goals of which you mentioned two, control and non-self re-setting. The other problem was that the parts are not bolt-in, wire up and play. You have to install them on some manufactured assembly that incorporates an etched circuit board for mounting the parts. Even if we popped for the custom assembly, the TOTAL cost of acquisition/ownership wasn't that much better than what we were already doing. The breaker as a mil-qualified bolt-in- and-play parts require no special attention to mix and match as needed. A customized assembly has to be designed, qualified and becomes very hard to change once approved for the airframe. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.