diode isolate 200a relay/solenoid?

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=91543
Printed Date: May 13, 2025 at 5:51 AM

Topic: diode isolate 200a relay/solenoid?

Posted By: tremors834
Subject: diode isolate 200a relay/solenoid?
Date Posted: March 11, 2007 at 11:15 AM

Any reason or need to Diode Isolate the solenoid coil in the following diagram?

posted_image

Replies:

Posted By: KPierson
Date Posted: March 11, 2007 at 7:08 PM

No.

-------------
Kevin Pierson

Posted By: tremors834
Date Posted: March 11, 2007 at 8:07 PM

Thanks, I didn't think so but I figured I'd check after reading a post in the security forum concerning diode isolating.

Posted By: KPierson
Date Posted: March 11, 2007 at 8:43 PM

You really only need the diode when you have discreet circuitry driving the coil. If you have a switch you'll be fine.

-------------
Kevin Pierson

Posted By: tremors834
Date Posted: March 12, 2007 at 7:24 AM

by "discreet" do you mean low power / sensitive electronics?

Posted By: KPierson
Date Posted: March 12, 2007 at 9:22 AM

Mostly transistors, as that is what is seen most of the time.

-------------
Kevin Pierson

Posted By: audiocableguy
Date Posted: March 12, 2007 at 11:38 AM

Moving your first 150A fuse before the solenoid instead of after might offer more protection. If something were to short agaist the solenoid terminals or changing out the solenoid you'd be covered.

Posted By: tremors834
Date Posted: March 12, 2007 at 5:38 PM

audiocableguy wrote:

Moving your first 150A fuse before the solenoid instead of after might offer more protection.

Great point, Thank you. Above diagram has been updated.

Print Page | Close Window