---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 03/02/09: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:38 AM - B and C Starter relay (Ralph E. Capen) 2. 08:57 AM - Re: B and C Starter relay (Hinde, Frank George (Corvallis)) 3. 09:43 AM - Re: B and C Starter relay (Dale Rogers) 4. 09:53 AM - Re: B and C Starter relay (Ralph E. Capen) 5. 10:02 AM - Re: B and C Starter relay (Ralph E. Capen) 6. 10:23 AM - Re: B and C Starter relay (Hinde, Frank George (Corvallis)) 7. 10:37 AM - Re: B and C Starter relay (John Cox) 8. 03:32 PM - Re: B and C Starter relay (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 08:38:06 AM PST US From: "Ralph E. Capen" Subject: AeroElectric-List: B and C Starter relay Does anyone know how much current the B & C S702-1 starter relay draws at the "S" terminal when active? I know that the two large terminals will carry what I need - I'm trying to determine if the 6A @ 12VDC capable switch that I would like to use is sufficient or whether I need a relay to drive the starter relay. Thanks, Ralph Capen ________________________________ Message 2 _____________________________________ Time: 08:57:36 AM PST US From: "Hinde, Frank George (Corvallis)" Subject: RE: AeroElectric-List: B and C Starter relay I don't know for sure but I would not go with an intermediate relay in any case as you are adding parts count..I.e something else that can leave you stranded far away from home if it goes wrong. If you need to (and I doubt that you will because this is a short term load) I would get a bigger switch. Frank -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph E. Capen Sent: Monday, March 02, 2009 8:36 AM Subject: AeroElectric-List: B and C Starter relay --> Does anyone know how much current the B & C S702-1 starter relay draws at the "S" terminal when active? I know that the two large terminals will carry what I need - I'm trying to determine if the 6A @ 12VDC capable switch that I would like to use is sufficient or whether I need a relay to drive the starter relay. Thanks, Ralph Capen ________________________________ Message 3 _____________________________________ Time: 09:43:58 AM PST US From: Dale Rogers Subject: Re: AeroElectric-List: B and C Starter relay Ralph, Do you have access to an ohm meter (or DMM)? Measure the resistance of the relay coil (S-term to GND) and divide 12v by the value you get and you will have the amperes it draws. Dale R. Ralph E. Capen wrote: > > Does anyone know how much current the B & C S702-1 starter relay draws at the "S" terminal when active? > > I know that the two large terminals will carry what I need - I'm trying to determine if the 6A @ 12VDC capable switch that I would like to use is sufficient or whether I need a relay to drive the starter relay. > > ________________________________ Message 4 _____________________________________ Time: 09:53:33 AM PST US From: "Ralph E. Capen" Subject: RE: AeroElectric-List: B and C Starter relay Frank, I like your answer........ Ralph -----Original Message----- >From: "Hinde, Frank George (Corvallis)" >Sent: Mar 2, 2009 11:55 AM >To: "aeroelectric-list@matronics.com" >Subject: RE: AeroElectric-List: B and C Starter relay > > >I don't know for sure but I would not go with an intermediate relay in any case as you are adding parts count..I.e something else that can leave you stranded far away from home if it goes wrong. > >If you need to (and I doubt that you will because this is a short term load) I would get a bigger switch. > >Frank > >-----Original Message----- >From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph E. Capen >Sent: Monday, March 02, 2009 8:36 AM >To: Aeroelectric-list >Subject: AeroElectric-List: B and C Starter relay > >--> > >Does anyone know how much current the B & C S702-1 starter relay draws at the "S" terminal when active? > >I know that the two large terminals will carry what I need - I'm trying to determine if the 6A @ 12VDC capable switch that I would like to use is sufficient or whether I need a relay to drive the starter relay. > >Thanks, > >Ralph Capen > > ________________________________ Message 5 _____________________________________ Time: 10:02:48 AM PST US From: "Ralph E. Capen" Subject: Re: AeroElectric-List: B and C Starter relay B&C's website states "Coil resistance is 2.5 ohms." 12 divided by 2.5 equals 4.8 - I guess this is my first electrical engineering lesson?! If this is correct, it does tell me that my switch is OK..... -----Original Message----- >From: Dale Rogers >Sent: Mar 2, 2009 12:00 PM >To: aeroelectric-list@matronics.com >Subject: Re: AeroElectric-List: B and C Starter relay > > >Ralph, > > Do you have access to an ohm meter (or DMM)? >Measure the resistance of the relay coil (S-term to GND) >and divide 12v by the value you get and you will have >the amperes it draws. > >Dale R. > >Ralph E. Capen wrote: >> >> Does anyone know how much current the B & C S702-1 starter relay draws at the "S" terminal when active? >> >> I know that the two large terminals will carry what I need - I'm trying to determine if the 6A @ 12VDC capable switch that I would like to use is sufficient or whether I need a relay to drive the starter relay. >> >> > > ________________________________ Message 6 _____________________________________ Time: 10:23:53 AM PST US From: "Hinde, Frank George (Corvallis)" Subject: RE: AeroElectric-List: B and C Starter relay Yup! -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ralph E. Capen Sent: Monday, March 02, 2009 10:01 AM Subject: Re: AeroElectric-List: B and C Starter relay --> B&C's website states "Coil resistance is 2.5 ohms." 12 divided by 2.5 equals 4.8 - I guess this is my first electrical engineering lesson?! If this is correct, it does tell me that my switch is OK..... -----Original Message----- >From: Dale Rogers >Sent: Mar 2, 2009 12:00 PM >To: aeroelectric-list@matronics.com >Subject: Re: AeroElectric-List: B and C Starter relay > > >Ralph, > > Do you have access to an ohm meter (or DMM)? >Measure the resistance of the relay coil (S-term to GND) and divide 12v >by the value you get and you will have the amperes it draws. > >Dale R. > >Ralph E. Capen wrote: >> --> >> >> Does anyone know how much current the B & C S702-1 starter relay draws at the "S" terminal when active? >> >> I know that the two large terminals will carry what I need - I'm trying to determine if the 6A @ 12VDC capable switch that I would like to use is sufficient or whether I need a relay to drive the starter relay. >> >> > > ________________________________ Message 7 _____________________________________ Time: 10:37:36 AM PST US Subject: RE: AeroElectric-List: B and C Starter relay From: John Cox A great rule of thumb is to size your switch so any surge current does not exceed 80% of its capacity. John Cox From: Ralph E. Capen Sent: Mon 3/2/2009 10:00 AM Subject: Re: AeroElectric-List: B and C Starter relay k.net> B&C's website states "Coil resistance is 2.5 ohms." 12 divided by 2.5 equals 4.8 - I guess this is my first electrical engineer ing lesson?! If this is correct, it does tell me that my switch is OK..... -----Original Message----- >From: Dale Rogers >Sent: Mar 2, 2009 12:00 PM >To: aeroelectric-list@matronics.com >Subject: Re: AeroElectric-List: B and C Starter relay > > >Ralph, > > Do you have access to an ohm meter (or DMM)? >Measure the resistance of the relay coil (S-term to GND) >and divide 12v by the value you get and you will have >the amperes it draws. > >Dale R. > >Ralph E. Capen wrote: link.net> >> >> Does anyone know how much current the B & C S702-1 starter relay draws a t the "S" terminal when active? >> >> I know that the two large terminals will carry what I need - I'm trying to determine if the 6A @ 12VDC capable switch that I would like to use is s ufficient or whether I need a relay to drive the starter relay. >> >> > > ________________________________ Message 8 _____________________________________ Time: 03:32:46 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: B and C Starter relay At 10:35 AM 3/2/2009, you wrote: > > >Does anyone know how much current the B & C S702-1 starter relay >draws at the "S" terminal when active? > >I know that the two large terminals will carry what I need - I'm >trying to determine if the 6A @ 12VDC capable switch that I would >like to use is sufficient or whether I need a relay to drive the starter relay. That switch will be fine. The contactor draws a lot more that a continuous duty battery contactor (typically 4A versus 1A) but the REAL concern for switch life has to do with the catch diode being installed on the coil. If B&C is buying the same part I used to sell as S702-1, the diode is built in. If you look on the bottom mounting plate, you should see some words speaking to "suppression" stamped in the metal. What kind of switch are you talking about? Does it have a nice "snap" action? 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.