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spdt or spst


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over_boost 
Member - Posts: 16
Member spacespace
Joined: January 30, 2008
Location: Alberta, Canada
Posted: February 01, 2008 at 4:03 PM / IP Logged  

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.

swerve 
Copper - Posts: 149
Copper spacespace
Joined: January 10, 2007
Location: Oregon, United States
Posted: February 01, 2008 at 4:11 PM / IP Logged  

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.

git yer swerve on!
KPierson 
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: February 01, 2008 at 5:19 PM / IP Logged  

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.

Kevin Pierson

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