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Diodes across relay coil

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=225
Printed Date: June 10, 2024 at 7:53 PM


Topic: Diodes across relay coil

Posted By: JimR
Subject: Diodes across relay coil
Date Posted: April 03, 2002 at 9:24 AM

"Diodes are often used across across coil to ..."

A diode across the coil of a relay provides a path for current when the current path to the relay is interrupted (i.e. switched off).  This allows the coil field to collapse without the voltage spike that would otherwise be generated.  The diode protects switch or relaly contacts and other circuits that may be sensitive to voltage spikes.  



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JimR



Replies:

Posted By: the12volt
Date Posted: April 03, 2002 at 12:21 PM

Hi JimR, thanks for your detailed explanation. To expand on what little I've written, I've quoted you here:  https://www.the12volt.com/relays/relays.asp

 the12volt


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