identify a relay

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=112500
Printed Date: July 21, 2025 at 1:56 PM

Topic: identify a relay

Posted By: bill4x4x4
Subject: identify a relay
Date Posted: March 19, 2009 at 12:58 PM

hi all, first time posting....

I have been given a large quanity of Single Pole Double Throw relays, from a surplus supplier, but none of them have any description printed on them.

Is there any way to tell the rating of the relay?? (ie 30amp, 40amp etc) i have opened one up, but that didnt help at all...

thanks in advance.

Replies:

Posted By: bill4x4x4
Date Posted: March 19, 2009 at 1:20 PM

posted_image

maybe i should of attached the pic too..

Posted By: ckeeler
Date Posted: March 19, 2009 at 4:11 PM

what are the terminals labeled?

Posted By: bill4x4x4
Date Posted: March 19, 2009 at 8:08 PM

The standard 12v ones, 85, 86, 87, 87a, 30

Posted By: 91stt
Date Posted: March 19, 2009 at 9:47 PM

It's going to be difficult to tell just by looking at the relay. The lowest current rating for any bosche/tyco type realy I have ever seen is 20A. So I would think that it can be used up to 20A relatively safely.

Posted By: ckeeler
Date Posted: March 20, 2009 at 8:51 AM

exactly what i was going to say.

Posted By: bill4x4x4
Date Posted: March 20, 2009 at 12:03 PM

No problem, i will take it that they are 20 amp and stay on the safe side.

Cheers.

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