---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 12/14/23: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:14 PM - Re: Switch Question (farmrjohn) 2. 04:29 PM - Re: Switch Question (user9253) ________________________________ Message 1 _____________________________________ Time: 04:14:40 PM PST US Subject: AeroElectric-List: Re: Switch Question From: "farmrjohn" Reviving an old thread, when the original generator was swapped out for an alternator they utilizedg only one pole of the two pole switch to connect the batter to the bus, leaving the other side unused. Would it be possible to utilize the unused poles to control a master contractor leaving the heavy wiring from the batter to the switch in place? That way when the switch was closed it would energize the contractor and allow the connection to the bus, and provide a backup method of disconnecting the battery should the contractor fail closed for any reason. This is in anticipation of pursuing a field approval for a contacor. Thanks, John nuckolls.bob(at)aeroelect wrote: > At 03:41 PM 11/24/2020, you wrote: > > > At 10:33 AM 11/24/2020, you wrote: > > > > > > > > My master switch is specified as an AN 3023-2. I have been unable to find any documentation on just what that is, other than some type of DPST switch. Is there a source for decoding the AN switch specifications? > > > > > > > That is a vintage switch dating back to the 40's or earlier. > > It's reminiscent of the master switch in a Piper TriPacer > > I took dual in wwwaayyy back when. BEEFY switch, no battery > > master relay. > > > > They're still available as you can see here . . . > > > > https://tinyurl.com/y57x62bp (https://tinyurl.com/y57x62bp) > > > > What's your application? > > > > > > P.S. I have confirmed that this switch was used on > Univair (ERCO) aircraft as the primary current > carrying device for ship's power. This IS a high > current switch . . . probably rated at 30A or more. > > If that's how it's used in your application, suggest > you add a battery master contactor thus allowing > substitution of a friendlier toggle switch. > > > > Bob . . . > > Un impeachable logic: George Carlin asked, "If black boxes > survive crashes, why don't they make the whole airplane > out of that stuff?" Read this topic online here: http://forums.matronics.com/viewtopic.php?p=512785#512785 ________________________________ Message 2 _____________________________________ Time: 04:29:46 PM PST US Subject: AeroElectric-List: Re: Switch Question From: "user9253" Contactors are unlikely to fail closed. I would remove existing cables between the battery and main power bus. Then install a contactor between the battery and bus. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=512786#512786 ------------------------------------------------------------------------------------- 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.