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mystery relay - turns out it's a 40 A relay like S8009-1

 
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johnbright



Joined: 14 Dec 2011
Posts: 78
Location: Newport News, VA

PostPosted: Sat Feb 22, 2020 8:07 pm    Post subject: mystery relay - turns out it's a 40 A relay like S8009-1 Reply with quote

Question... what is the part number of this relay shown in Z-02 and Z-07?

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John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://drive.google.com/drive/folders/1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K


Last edited by johnbright on Mon Feb 24, 2020 7:47 am; edited 2 times in total
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user9253



Joined: 28 Mar 2008
Posts: 1514
Location: Riley TWP Michigan

PostPosted: Sun Feb 23, 2020 3:48 pm    Post subject: Re: mystery relay Reply with quote

Search internet for "40 amp automotive relay".
You can buy relays at auto parts stores.
Some relays come with a built-in arc suppression diode,
but they are not easy to find.
So, install a diode across the relay coil with the banded end towards positive.


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Joe Gores
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johnbright



Joined: 14 Dec 2011
Posts: 78
Location: Newport News, VA

PostPosted: Sun Feb 23, 2020 7:25 pm    Post subject: Re: mystery relay Reply with quote

user9253 wrote:
Search internet for "40 amp automotive relay".


Thanks Joe,

I was expecting a 40 A relay to be labeled S8009-1, that's what led me to call it Mystery Relay. Z-02, which is preliminary, implies the relay is able to carry enough current to blow a MANL 30; I wasn't sure a 40 A relay would do that.

I gather a 40 A automotive relay is TE connectivity 1432791-1 or similar.


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John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://drive.google.com/drive/folders/1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K
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user9253



Joined: 28 Mar 2008
Posts: 1514
Location: Riley TWP Michigan

PostPosted: Mon Feb 24, 2020 6:19 am    Post subject: Re: mystery relay Reply with quote

The current rating of a relay has been determined by the manufacturer to
provide a useful service life. If a relay is operated above its rating, it will not
immediately self destruct, but its life will be shortened. If a relay is already
energized when a short circuit occurs, a relay could carry 2 or 3 times its rated
current for a short time, long enough for an ANL fuse to blow.


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