Curious ? About Relays

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Printed Date: July 17, 2025 at 6:11 AM

Topic: Curious ? About Relays

Posted By: Gentleman
Subject: Curious ? About Relays
Date Posted: December 04, 2002 at 4:10 PM

How did the numbers 12,30,86,87 on the terminals come about.

Thanks

Replies:

Posted By: the12volt
Date Posted: December 04, 2002 at 4:34 PM

It's a DIN (Deutsche Industrie Normen) standard, although I can't tell you how they came to use those particular numbers for an SPDT relay (30, 85, 86, 87, 87a) or any of the others for that matter ;) If you find some history on it, please let us know.

Posted By: EVSolutions
Date Posted: February 16, 2003 at 11:48 PM

What I know is it started in Germany with the Bosch relays.

Sean

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