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spdt or spst

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=101776
Printed Date: April 29, 2024 at 2:41 AM


Topic: spdt or spst

Posted By: over_boost
Subject: spdt or spst
Date Posted: February 01, 2008 at 4:03 PM

hi there, i was wondering which type of relay is better to use in a vehicle.  Would it be a spdt or spst?

Thank you.




Replies:

Posted By: swerve
Date Posted: February 01, 2008 at 4:11 PM

the difference is the spdt has a normally open and a normally closed contact. the spst has a normally open contact only. it all depends on what you need the relay to do. the spdt is gonna be your most common relay available so go with that one, and try to get bosch ones cuz they last alot longer.



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git yer swerve on!



Posted By: KPierson
Date Posted: February 01, 2008 at 5:19 PM

For common switching (on/off) applications a SPST relay should suffice.  For more involved applications, like 5 wire motor control or starter kills.

As swerve said though, a SPDT relay will probably be more readily available and the price difference shouldn't be noticable.



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Kevin Pierson


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