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
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| Subject: | 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
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| Subject: | 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
--> <recapen@earthlink.net>
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
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| Subject: | Re: 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
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| Subject: | B and C Starter relay |
Frank,
I like your answer........
Ralph
-----Original Message-----
>From: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
>Sent: Mar 2, 2009 11:55 AM
>To: "aeroelectric-list@matronics.com" <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
>
>--> <recapen@earthlink.net>
>
>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
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| Subject: | Re: 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 <dale.r@cox.net>
>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
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| Subject: | 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
--> <recapen@earthlink.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 engineering
lesson?!
If this is correct, it does tell me that my switch is OK.....
-----Original Message-----
>From: Dale Rogers <dale.r@cox.net>
>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:
>> --> <recapen@earthlink.net>
>>
>> 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
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| Subject: | B and C Starter relay |
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 <dale.r@cox.net>
>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
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| Subject: | Re: B and C Starter relay |
At 10:35 AM 3/2/2009, you wrote:
><recapen@earthlink.net>
>
>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- )
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